US Patent Class 277
SEAL FOR A JOINT OR JUNCTURE



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Current as of: June, 1999
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  DF  CLASS NOTES
300  DF  PROCESS OF DYNAMIC SEALING
301  DF  .~ Close proximity seal (e.g., contactless, fluent, etc.)
302  DF  .~.~ Magnetic
303  DF  .~.~ Labyrinth
304  DF  .~.~ Formed by pressurized sealing fluid introduced to form barrier
305  DF  .~.~ Floating ring or bushing
306  DF  .~ Relatively rotatable radially extending sealing face member (e.g., face, mechanical, etc.)
307  DF  .~.~ Formed by flexible projection
308  DF  .~ Contained or compressed by gland member in packing box
309  DF  .~ Peripheral radially sealing flexible projection (e.g., lip, piston cup seal, etc.)
310  DF  .~ Piston ring for internal combustion engine
311  DF  .~ Flexible ring
312  DF  PROCESS OF STATIC SEALING
313  DF  .~ Between parts of internal combustion engine
314  DF  .~ Pipe, conduit, or cable
315  DF  .~ Using flexible sleeve, boot, or diaphragm
316  DF  .~ Forming in place (i.e., in situ)
317  DF  SEAL COMBINED WITH INDICATOR, SAMPLER, OR INSPECTION FEATURE
318  DF  .~ Fluid pressure
319  DF  .~ Fluid temperature
320  DF  .~ Fluid leakage
321  DF  .~ Wear, proper seating, or presence
322  DF  SEAL FOR WELL APPARATUS
323  DF  .~ Installation, removal, assembly, disassembly, or repair feature
324  DF  .~ For overpressure control device (e.g., seal for a blowout preventer, etc.)
325  DF  .~.~ Segmented radially actuated (e.g., ram type, etc.)
326  DF  .~.~ Rotatable
327  DF  .~.~ Axially compressed ring
328  DF  .~ Longitudinally actuated packer for above ground apparatus
329  DF  .~.~ Contained or compressed by gland member in packing box
330  DF  .~.~.~ For line or cable
331  DF  .~ Inflatable packer
332  DF  .~.~ Deforms radially inward
333  DF  .~.~ And inflating medium control
334  DF  .~.~ Particular wall structure
335  DF  .~ Axially facing packing cup
336  DF  .~ For below ground apparatus
337  DF  .~.~ Longitudinally actuated packer
338  DF  .~.~.~ Packing sleeve
339  DF  .~.~.~.~ Expanded by wedging member
340  DF  .~.~.~.~ Particular wall structure
341  DF  .~.~.~.~.~ Reinforcing feature
342  DF  .~.~.~ Plural stacked rings
343  DF  .~ Seal (e.g., wiper, oil saver, stripper, etc.) accommodates irregular size of inner part
344  DF  .~ Segmented radially actuated packer (e.g., oil saver, gas saver, etc.) for above ground apparatus
345  DF  SEAL BETWEEN RELATIVELY MOVABLE PARTS (I.E., DYNAMIC SEAL)
346  DF  .~ Diverse and distinct dynamic seals
347  DF  .~.~ Close proximity seal (e.g., contactless, fluent, etc.)
348  DF  .~.~.~ And relatively rotatable radially extending contacting sealing members (e.g., face, mechanical, etc.)
349  DF  .~.~.~.~ And circumferential peripheral radially sealing flexible projection (e.g., lip seal, etc.)
350  DF  .~.~.~ And circumferential contact seal
351  DF  .~.~.~.~ Peripheral radially sealing flexible projection (e.g., lip seal, etc.)
352  DF  .~.~ Relatively rotatable radially extending contacting sealing members (e.g., face, mechanical, etc.)
353  DF  .~.~ And circumferential peripheral radially sealing flexible projection (e.g., lip seal, etc.)
354  DF  .~ Helically threaded part
355  DF  .~ Brush seal
356  DF  .~ For journal box (e.g., railway car journal, etc.)
357  DF  .~ For rotary piston
358  DF  .~ Relatively rotatable radially extending sealing face member (e.g., face, mechanical, etc.)
359  DF  .~.~ Temperature responsive feature
360  DF  .~.~.~ Accommodates or prevents thermal distortion
361  DF  .~.~ Multiple sealing faces (e.g., double seals, etc.)
362  DF  .~.~.~ Floating intermediate sealing face member
363  DF  .~.~.~.~ Including an outwardly axial biasing member
364  DF  .~.~.~ Concentric and radially spaced
365  DF  .~.~.~ Three or more
366  DF  .~.~.~ Shaft mounted sealing face members biased axially away from each other
367  DF  .~.~.~ Shaft mounted sealing face members biased axially towards each other
368  DF  .~.~.~ Housing mounted sealing face members biased axially away from each other
369  DF  .~.~.~ Housing mounted sealing face members biased axially towards each other
370  DF  .~.~ Installation, removal, assembly, disassembly, or repair feature
371  DF  .~.~.~ Unitized seal assembly (e.g., cartridge, etc.)
372  DF  .~.~.~.~ Having rotation prevention (i.e., antirotation) feature for the sealing face member
373  DF  .~.~.~.~.~ Lug or rib
374  DF  .~.~.~.~ Retains opposed sealing face members
375  DF  .~.~.~.~ Mounted in housing or casing
376  DF  .~.~.~.~.~ Snap fit into groove
377  DF  .~.~ Particular axial biasing feature
378  DF  .~.~.~ Magnetic
379  DF  .~.~.~ Particular spring feature
380  DF  .~.~.~.~ Made of elastomeric material
381  DF  .~.~.~.~.~ Frustoconical shape
382  DF  .~.~.~.~.~ O-ring shape
383  DF  .~.~.~.~ Imbedded in another material
384  DF  .~.~.~.~ Washerlike shape
385  DF  .~.~.~.~ Arrangement or location
386  DF  .~.~.~.~.~ Radially biasing member creates axial bias
387  DF  .~.~.~ Fluid pressure
388  DF  .~.~.~.~ Creates counter pressure
389  DF  .~.~.~.~ And bellows or diaphragm
390  DF  .~.~ Particular secondary mounting seal or driving connection
391  DF  .~.~.~ Flexible sleeve, boot, or diaphragm
392  DF  .~.~.~.~ Between sealing face member and shaft or part relating to shaft
393  DF  .~.~.~.~ Particular connecting feature to sealing face member
394  DF  .~.~.~ Peripheral radially sealing flexible projection (e.g., lip seal, etc.)
395  DF  .~.~.~.~ U- or V-shaped cross-sectional profile
396  DF  .~.~.~ Axially compressed packing
397  DF  .~.~.~ Frictionally engaged or interfitting projection and recess
398  DF  .~.~ Eccentric, gyratory, or oscillatory motion
399  DF  .~.~ Particular sealing face member configuration
400  DF  .~.~.~ Hydrodynamic feature
401  DF  .~.~.~ Fluid passage to the sealing face
402  DF  .~.~.~ Flexible projection (e.g., lip seal, etc.)
403  DF  .~.~.~ Angled or tapered sealing face
404  DF  .~.~ Made of particular material
405  DF  .~.~.~ Ceramic
406  DF  .~.~.~ Metal
407  DF  .~.~.~ Elastomeric or plastic
408  DF  .~.~ Introduction, circulation, or removal of fluid
409  DF  .~ Close proximity seal (e.g., contactless, fluent, etc.)
410  DF  .~.~ Magnetic
411  DF  .~.~ Gap or clearance
412  DF  .~.~.~ Labyrinth
413  DF  .~.~.~.~ Having adjustable member
414  DF  .~.~.~.~ Formed by cellular pockets (e.g., honeycomb, etc.)
415  DF  .~.~.~.~ Having wear resistant, abradable, or ablative member
416  DF  .~.~.~.~ Segmented
417  DF  .~.~.~.~ Formed by multiple washers
418  DF  .~.~.~.~ Formed by plural grooves or projections on opposing surfaces
419  DF  .~.~.~.~.~ Interfitting or overlapping
420  DF  .~.~.~.~.~.~ And axially oriented
421  DF  .~.~.~.~ Having installation, removal, assembly, disassembly, or repair feature
422  DF  .~.~.~ Floating ring or bushing
423  DF  .~.~ Impeller (e.g., slinger, etc.)
424  DF  .~.~.~ Rib or groove on radial extending surface
425  DF  .~.~.~ And static sealing means affected by rotational movement
426  DF  .~.~.~.~ Actuated by counterweight
427  DF  .~.~.~ Forms centrifugal liquid barrier
428  DF  .~.~.~.~ Having cup or chamber inside the impeller or another rotating member
429  DF  .~.~.~ Fluid collector or receiver
430  DF  .~.~.~ Helical groove or thread on axially extending surface
431  DF  .~.~ Formed by pressurized sealing fluid introduced to form barrier
432  DF  .~.~.~ External device or system
433  DF  .~ Centrifugal force affects change in displacement, shape, or contact
434  DF  .~ Piston ring or piston ring expander or seat therefor
435  DF  .~.~ Having installation, removal assembly, disassembly, or repair feature
436  DF  .~.~ Piston ring having peripheral radially sealing flexible projection (e.g., piston cup, etc.)
437  DF  .~.~.~ Having particular mounting, retaining, or supporting feature
438  DF  .~.~.~ Having C, U, or V cross-sectional profile
439  DF  .~.~.~.~ Axially facing cup
440  DF  .~.~ Piston ring surface of dissimilar material or hardness
441  DF  .~.~.~ Insert
442  DF  .~.~.~ Surface coating, plating, or impregnation
443  DF  .~.~.~.~ Nitrided
444  DF  .~.~.~.~ Chromium
445  DF  .~.~ Rotation limiting feature (i.e., antirotation)
446  DF  .~.~.~ Between rings
447  DF  .~.~ Floating piston ring
448  DF  .~.~.~ Material other than metal
449  DF  .~.~ Particular piston seat
450  DF  .~.~.~ Helical form
451  DF  .~.~.~ Stepped walls
452  DF  .~.~.~ Oblique wall
453  DF  .~.~.~.~ More than one oblique wall
454  DF  .~.~.~.~.~ Having parallel walls
455  DF  .~.~.~ Arcuate wall
456  DF  .~.~.~ Coating, treatment, or wall insert
457  DF  .~.~.~ Having passageway for fluid return, pressure relief, or venting
458  DF  .~.~ Piston ring having single piece noncircular or multiturn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape
459  DF  .~.~ Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel
460  DF  .~.~.~ Circumferential groove, channel, recess, or bevel
461  DF  .~.~.~.~ Axially spaced
462  DF  .~.~.~.~.~ Ports
463  DF  .~.~.~.~ Ports
464  DF  .~.~.~ Circumferentially spaced ports
465  DF  .~.~.~ Circumferentially spaced slots, pockets, grooves, channels, recesses, or bevels
466  DF  .~.~ Piston ring displays twisting or torsion
467  DF  .~.~ Particular piston ring expander
468  DF  .~.~.~ Separate and other than metal
469  DF  .~.~.~ Bias limiting feature
470  DF  .~.~.~ Adjustable loading feature
471  DF  .~.~.~ Thermal expansion feature
472  DF  .~.~.~ Annular expander nested in annular groove of the piston ring
473  DF  .~.~.~.~ Between piston rings
474  DF  .~.~.~.~ And contacting surfaces therebetween are complementary
475  DF  .~.~.~.~.~ Having more than one pair of such surfaces
476  DF  .~.~.~.~ Inclined or beveled groove contacting expander having dissimilar contour
477  DF  .~.~.~ Slotted or undulating circular band including inclined or axially facing seat for the piston ring
478  DF  .~.~.~.~ Axially spaced axially facing seats
479  DF  .~.~.~.~.~ Circular band having radially displaced undulations
480  DF  .~.~.~.~.~ Circular band having axially displaced undulations
481  DF  .~.~.~.~.~ U-shaped circular band radially directed either inwardly or outwardly throughout its circumference
482  DF  .~.~.~ Circumferentially spaced separately seated radially acting bias feature
483  DF  .~.~.~.~ Disposed in socket or about pin
484  DF  .~.~.~ Radially extending tongue formed from expander
485  DF  .~.~.~ Undulating periphery providing axially extending face against inner perimeter of the piston ring
486  DF  .~.~.~ Bias feature adjoining opposed ends of split or segmented piston ring
487  DF  .~.~.~ Segmented
488  DF  .~.~.~ For axially adjacent piston rings
489  DF  .~.~ Sectional piston ring structure
490  DF  .~.~.~ Eccentric or variable thickness component ring
491  DF  .~.~.~ C, L, T, U, V, or Z cross-sectional profile
492  DF  .~.~.~.~ Three or more sections
493  DF  .~.~ Segmented piston ring
494  DF  .~.~ Separate bridging piece for gap in piston ring
495  DF  .~.~.~ Secured to end
496  DF  .~.~ Split single piece piston ring having opposed asymmetrical mirrored ends
497  DF  .~.~.~ Arcuate or beveled mating surfaces
498  DF  .~.~ Split single piece piston ring having other than opposed asymmetrical mirrored ends
499  DF  .~.~.~ Arcuate or beveled mating surfaces
500  DF  .~ Circumferential contact seal for other than piston
501  DF  .~.~ And magnetic bias
502  DF  .~.~ For valve stem in internal combustion engine
503  DF  .~.~ Accommodates gyratory or oscillatory motion
504  DF  .~.~.~ Flexible connection between seal and another part
505  DF  .~.~.~ Oscillates perpendicularly to axis of motion
506  DF  .~.~.~ Arcuate bearing surface
507  DF  .~.~.~.~ Partially spherical
508  DF  .~.~.~ Axially spring biased
509  DF  .~.~.~.~ Coaxial spring
510  DF  .~.~ Contained or compressed by gland member in packing box
511  DF  .~.~.~ Having installation, removal, assembly, disassembly, or repair feature
512  DF  .~.~.~ Fluid introducer or director
513  DF  .~.~.~.~ External device or system
514  DF  .~.~.~.~ Drain, pressure relief, or vent
515  DF  .~.~.~.~ Passage through axial facing surface
516  DF  .~.~.~.~ Spacer between seals (e.g., lantern ring, etc.)
517  DF  .~.~.~.~ Between packing boxes
518  DF  .~.~.~ Plural distinct packing boxes
519  DF  .~.~.~ Segmented packing boxes
520  DF  .~.~.~ Particular gland feature
521  DF  .~.~.~.~ Segmented
522  DF  .~.~.~.~ Spring bias
523  DF  .~.~.~.~.~ Disposed about external bolt or stud
524  DF  .~.~.~.~ Eye or T-type bolt
525  DF  .~.~.~.~ Internally threaded
526  DF  .~.~.~.~ Externally threaded
527  DF  .~.~.~ Wear sleeve
528  DF  .~.~.~ Helically coiled packing
529  DF  .~.~.~ Having particular cross-sectional seal profile
530  DF  .~.~.~.~ C-, M-, U-, V-, X-, or Z-shaped
531  DF  .~.~.~.~ Wedging surface
532  DF  .~.~.~.~.~ Made of elastomer or plastic
533  DF  .~.~.~.~.~ Segmented
534  DF  .~.~.~ Particular seal material or construction
535  DF  .~.~.~.~ Composite
536  DF  .~.~.~.~.~ Fibrous component
537  DF  .~.~.~.~.~.~ Braided, woven, or twisted
538  DF  .~.~.~.~.~ Distinct sheath or covering
539  DF  .~.~.~.~ Graphite
540  DF  .~.~.~.~ Elastomer or plastic
541  DF  .~.~.~.~ Metal
542  DF  .~.~.~ Consisting of loose-fill type packing
543  DF  .~.~ Segmented ring
544  DF  .~.~.~ Having pressure balancing or radial bias reduction feature
545  DF  .~.~.~ Radial biasing spring element other than nominal garter spring
546  DF  .~.~.~ Particular segment end structure
547  DF  .~.~.~.~ Interfitting projection and recess
548  DF  .~.~.~ Plural complementary interfitting rings
549  DF  .~.~ Peripheral radially sealing flexible projection (e.g., lip seal, etc.)
550  DF  .~.~.~ Made of metal or is a scraper
551  DF  .~.~.~ Having installation, removal, assembly, disassembly, or repair feature
552  DF  .~.~.~ Having pressure relief or venting feature
553  DF  .~.~.~ Bias feature other than nominal garter spring
554  DF  .~.~.~.~ Embedded spring
555  DF  .~.~.~.~ Radially extending finger spring
556  DF  .~.~.~.~ Material other than metal
557  DF  .~.~.~.~ Axially extending helical or spiral spring
558  DF  .~.~.~.~ Particular fluid pressure responsive bias
559  DF  .~.~.~ Hydrodynamic sealing feature
560  DF  .~.~.~ Dimensional aspect of the flexible projection (e.g., angle, length, radius, thickness, etc.)
561  DF  .~.~.~ Intermediate flexible bending portion
562  DF  .~.~.~ Plural peripheral radially sealing flexible projections
563  DF  .~.~.~.~ Having interposed fluid receiver or director
564  DF  .~.~.~.~ Having insert between the flexible projections
565  DF  .~.~.~.~ On radial facing side of single seal
566  DF  .~.~.~.~.~ Both radial sides of the single seal (e.g., X-shaped, Y-shaped, etc.)
567  DF  .~.~.~.~.~ Radially facing U or V cross-sectional profile
568  DF  .~.~.~.~.~ Including an excluder or wiper
569  DF  .~.~.~ Lining or insert
570  DF  .~.~.~ Made entirely of fluorocarbon material
571  DF  .~.~.~ Wear sleeve
572  DF  .~.~.~ Particular mounting, frame, casing, or reinforcement feature
573  DF  .~.~.~.~ Peripheral mounting static seal
574  DF  .~.~.~.~.~ Protrusion or bead cross-sectional profile
575  DF  .~.~.~.~ Secured by molding or bonding
576  DF  .~.~.~.~ Secured by clamping
577  DF  .~.~.~.~.~ By distinct members
578  DF  .~.~ Having circumferentially adjustable biasing element
579  DF  .~.~ Having floating ring or bushing (i.e., circumferentially contacting)
580  DF  .~.~.~ Radially translatable in groove
581  DF  .~.~.~.~ And biased
582  DF  .~.~.~ Made of elastomer or plastic
583  DF  .~.~.~ Inflatable seal or seal biased by inflatable member
584  DF  .~.~ Extrusion preventing (i.e., antiextrusion) structure
585  DF  .~.~ Elongated sleeve or bushing
586  DF  .~.~ Seated in groove having stepped walls
587  DF  .~.~ Seated in groove having oblique wall
589  DF  .~.~ Radially backed by resilient or elastomeric member
590  DF  SEAL BETWEEN FIXED PARTS OR STATIC CONTACT AGAINST RELATIVELY MOVABLE PARTS
591  DF  .~ Contact seal between parts of internal combustion engine
592  DF  .~.~ Particular coating or layer of sealing material
593  DF  .~.~ Having compression limiting feature
594  DF  .~.~ Particular dimensions or configuration of sealing bead or formation
595  DF  .~.~.~ Metallic
596  DF  .~.~.~ Elastomeric
597  DF  .~.~ Heat dissipating, cooling, or insulating feature
598  DF  .~.~ Having installation, removal, assembly, disassembly, or repair feature
599  DF  .~.~ Having flow restrictor
600  DF  .~.~ Covering member or eyelet for opening
601  DF  .~.~.~ Covering fire ring or sealing formation
602  DF  .~ Contact seal for a pipe, conduit, or cable
603  DF  .~.~ Plural interfitting seal members for installation on the individual joined pipes, conduits, or cables
604  DF  .~.~ Allows rolling or folding
605  DF  .~.~ Hollow, fluid-filled, or inflatable
606  DF  .~.~ And wall
607  DF  .~.~ Sleeve type
608  DF  .~.~ Inserted between end-to-end pipe, conduit, or cable joint
609  DF  .~.~.~ Having installation, removal, assembly, disassembly, or repair feature
610  DF  .~.~.~ Spirally wound structure
611  DF  .~.~.~ Extrusion preventing (i.e., antiextrusion) or compression limiting feature
612  DF  .~.~.~ Having plural projections
613  DF  .~.~.~ Hose coupling
614  DF  .~.~.~ Each end has recess for the seal
615  DF  .~.~ Having axially spaced projections
616  DF  .~.~ Having associated mounting or retaining feature
617  DF  .~.~.~ Molded or cast into the pipe, conduit, or cable
618  DF  .~.~.~ Axially related or embedded coil spring
619  DF  .~.~.~ Axially related backing ring
620  DF  .~.~.~.~ Clamping gland
621  DF  .~.~.~.~.~ Particular axially acting feature
622  DF  .~.~.~.~.~.~ Threaded gland
623  DF  .~.~.~.~.~ Particular gland shape
624  DF  .~.~.~.~ And seal secure together
625  DF  .~.~.~ Particular and located on the pipe, conduit, or cable
626  DF  .~.~ Particular seal shape
627  DF  .~.~ Particular seal material or construction
628  DF  .~ Contact seal for other than internal combustion engine, or pipe, conduit, or cable
629  DF  .~.~ Magnetic
630  DF  .~.~ Having installation, removal, assembly, disassembly, or repair feature
631  DF  .~.~ Split including end joining structure
632  DF  .~.~ Segmented periphery
633  DF  .~.~ Spirally wound structure
634  DF  .~.~ Flexible sleeve, boot, or diaphragm
635  DF  .~.~.~ Dome-, cup-, or bell-shaped, or for ball joint
636  DF  .~.~.~ Tubular or frustoconical shape having corrugated wall portion
637  DF  .~.~ Having particular associated mounting or retaining feature
638  DF  .~.~.~ Extrusion preventing (i.e., antiextrusion) structure
639  DF  .~.~.~ Compression limiting feature
640  DF  .~.~.~ Anchoring feature extending through seal
641  DF  .~.~.~ Groove structure on the seal or part
642  DF  .~.~.~.~ Channel-shaped
643  DF  .~.~.~.~ Single seat formed by plural recesses
644  DF  .~.~ Particular cross-sectional seal profile
645  DF  .~.~.~ Hollow or filled chamber
646  DF  .~.~.~.~ Inflatable
647  DF  .~.~.~ C-, U-, or V-shaped
648  DF  .~.~.~ Plural projections along sealing surface
649  DF  .~.~.~.~ Plural projections along opposite sealing surfaces
650  DF  .~.~ Particular sealing material or construction
651  DF  .~.~.~ Embedded reinforcement
652  DF  .~.~.~ Distinct sheath or covering
653  DF  .~.~.~.~ Metal
654  DF  .~.~.~ Plural layers
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CROSS-REFERENCE ART COLLECTIONS
********************************
902  DF  SEAL FOR STERLING ENGINE
903  DF  SEAL FOR ROTATING KILN OR DRUM
904  DF  VISCOUS SEAL
905  DF  T-SHAPED OR I-SHAPED RING MEMBER INCLUDING SEAL ON A SIDE
906  DF  SEAL FOR ARTICLE OF INDEFINITE LENGTH (E.G., STRIP, SHEET, ETC.)
907  DF  PASSAGEWAY IN ROD OR SHAFT
908  DF  SEAL FOR USE IN ROTATING AND RECIPROCATING ARRANGEMENT
909  DF  SIMILAR SEALING STRUCTURES FOR MOUNTING ON PISTON AND ABOUT ROD
910  DF  O-RING SEAL
911  DF  SEAL COMBINED WITH NOMINAL MOTION TRANSMITTING DEVICE
912  DF  .~ Spline connection
913  DF  SEAL FOR FLUID PRESSURE BELOW ATMOSPHERIC (E.G., VACUUM, ETC.)
914  DF  BACKUP SEAL FOR FAILURE OF PRIMARY SEAL
915  DF  SEAL INCLUDING COMPRESSION SET FEATURE
916  DF  SEAL INCLUDING VIBRATION DAMPENING FEATURE
917  DF  SEAL INCLUDING FRANGIBLE FEATURE
918  DF  SEAL COMBINED WITH FILTER OR FLUID SEPARATOR
919  DF  SEAL INCLUDING ELECTRICAL FEATURE
920  DF  SEAL INCLUDING ELECTROMAGNETIC SHIELDING FEATURE
921  DF  CLOSURE OR WEATHER STRIP SEAL
922  DF  BONDING OR JOINING FOR MANUFACTURE OF SEAL
923  DF  .~ Shrink-fitting for the assembly of seal
924  DF  DEFORMATION, MATERIAL REMOVAL, OR MOLDING FOR MANUFACTURE OF SEAL
925  DF  SNAP FIT FEATURE FOR MOUNTING OR ASSEMBLY OF SEAL
926  DF  SEAL INCLUDING FLUID PRESSURE EQUALIZING OR BALANCING FEATURE
927  DF  SEAL INCLUDING FLUID PRESSURE DIFFERENTIAL FEATURE
928  DF  SEAL INCLUDING PRESSURE RELIEF OR VENT FEATURE
929  DF  SEAL FEATURE WHERE CHANGE IN OPERATION OR CONDITION INDUCES ADDITIONAL LEAKAGE CONTROL
930  DF  SEAL INCLUDING HEATING OR COOLING FEATURE
931  DF  SEAL INCLUDING TEMPERATURE RESPONSIVE FEATURE
932  DF  .~ Bi-metallic
933  DF  .~ Chemical reaction or physical change of state
934  DF  SEAL SWELLS WHEN WET
935  DF  SEAL MADE OF A PARTICULAR MATERIAL
936  DF  .~ Composite
937  DF  .~.~ Glass particles or filament
938  DF  .~.~ Carbon or graphite particle or filament
939  DF  .~ Containing metal
940  DF  .~.~ Alloy
941  DF  .~.~ Aluminum or copper
942  DF  .~.~ Silver or gold
943  DF  .~ Ceramic or glass
944  DF  .~ Elastomer or plastic
945  DF  .~.~ Containing fluorine
946  DF  .~.~.~ PTFE "TEFLON"
*********************************
FOREIGN ART COLLECTIONS
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FOR 100  DF  RADIALLY CONTAINED PACKING WITH AXIALLY ACTING FOLLOWER (277/102)
FOR 101  DF  .~ Piston (277/103)
FOR 102  DF  .~ Sectional follower (277/104)
FOR 103  DF  .~ Bolted flange (277/105)
FOR 104  DF  .~.~ Spring biased flange (277/106)
FOR 105  DF  .~ With operating handle (277/107)
FOR 106  DF  .~ With tool engaging means (277/108)
FOR 107  DF  .~ Weight actuated (277/109)
FOR 108  DF  .~ Screw thimble (277/110)
FOR 109  DF  .~.~ With locking means (277/111)
FOR 110  DF  .~ Screw (277/112)
FOR 111  DF  .~ With operating mechanism (277/113)
FOR 112  DF  .~ Unidirectional movement (277/114)
FOR 113  DF  .~ Tapered follower or box (277/115)
FOR 114  DF  .~.~ Arcuate (277/116)
FOR 115  DF  .~ Axially related backup member raidally actuated by movement of follower (277/116.2)
FOR 116  DF  .~ Telescoping actuator (277/116.4)
FOR 117  DF  .~.~ With inserted sleeve expander (277/116.6)
FOR 118  DF  .~.~ Deflected packing (277/116.8)
FOR 119  DF  .~ Wedging surfaces (277/117)
FOR 120  DF  .~.~ Internal shell (277/118)
FOR 121  DF  .~.~ Split or segmental packing (277/119)
FOR 122  DF  .~.~.~ Expanding and contracting (277/120)
FOR 123  DF  .~.~.~.~ Elastomeric (277/121)
FOR 124  DF  .~.~.~ Contracting (277/122)
FOR 125  DF  .~ Plural packing elements (277/123)
FOR 126  DF  .~.~ Nested (277/124)
FOR 127  DF  .~.~ Diverse (277/125)
FOR 128  DF  EXTERNALLY OPERATED ADJUSTMENT (277/126)
FOR 129  DF  .~ Fluid motor (277/127)
FOR 130  DF  .~ Circumferential band (277/128)
FOR 131  DF  .~ Acting along radius (277/129)
FOR 132  DF  LATERAL ACCESS TO PACKING BOX (277/130)
FOR 133  DF  .~ With distinct closure (277/131)
FOR 134  DF  .~.~ Packing attached (277/132)
FOR 135  DF  IMPELLER TYPE (277/133)
FOR 136  DF  .~ Axially acting(277/134)
FOR 137  DF  LIQUID BARRIER (277/135)
FOR 138  DF  WITH ANTIROTATION KEY OR ANCHOR (277/136)
FOR 139  DF  .~ Radial wall(277/137)
FOR 140  DF  WITH DISTINCT RADIALLY ACTING BIAS(277/138)
FOR 141  DF  .~ Unitary packing spacer and bias means (277/139)
FOR 142  DF  .~.~ U-section (277/140)
FOR 143  DF  .~ Common bias for axially spaced packings (277/141)
FOR 144  DF  .~ With axially acting bias means (277/142)
FOR 145  DF  .~ With axially component (277/143)
FOR 146  DF  .~.~ Complementary inclined surfaces (277/144)
FOR 147  DF  .~.~.~ Transversely symmetrical (277/145)
FOR 148  DF  .~ With bias restrainer (277/146)
FOR 149  DF  .~ With adjustable loading means (277/147)
FOR 150  DF  .~ Individually biased segments (277/148)
FOR 151  DF  .~ Circumferentially spaced radially acting springs (277/149)
FOR 152  DF  .~.~ With radial pin or socket (277/150)
FOR 153  DF  .~ Circumferential thrust (277/151)
FOR 154  DF  .~ Axial lip or boss (277/152)
FOR 155  DF  .~.~ Exposed coil spring (277/153)
FOR 156  DF  .~ Interfitted segments (277/154)
FOR 157  DF  .~ With bridging segments (277/155)
FOR 158  DF  .~ Break joint (277/156)
FOR 159  DF  .~ Periphery engaging spring (277/157)
FOR 160  DF  .~.~ Incompatible shapes (277/158)
FOR 161  DF  .~.~.~ Radially extending tongues (277/159)
FOR 162  DF  .~.~.~ Wave or undulate (277/160)
FOR 163  DF  .~.~.~ Polygonal (277/161)
FOR 164  DF  .~.~ Open-end (277/162)
FOR 165  DF  .~.~ Spiral (277/163)
FOR 166  DF  .~ Embedded or enclosed spring (277/164)
FOR 167  DF  .~ Nonmetallic (277/165)
FOR 168  DF  ANCHOR EXTENDING THROUGH OR INTERFITTED WITH PACKING (277/166)
FOR 169  DF  HELICAL SEAT (277/167)
FOR 170  DF  SERIALLY ARRANGED, SEPARATELY SEATED OR ANCHORED PACKING MEMBERS (277/167.3)
FOR 171  DF  SINGLE SEAT FORMED BY OPPOSED RECESSES IN PLURAL MEMBERS (277/167.5)
FOR 172  DF  LATITUDINALLY STEPPED OR TAPERED SEAT (277/168)
FOR 173  DF  .~ Arcuate wall (277/169)
FOR 174  DF  .~ Oblique wall (277/170)
FOR 175  DF  .~.~ Plural (277/171)
FOR 176  DF  .~.~.~ Parallel (277/172)
FOR 177  DF  FLOATING PACKING MEMBER (277/173)
FOR 178  DF  .~ Radially translatable (277/174)
FOR 179  DF  .~.~ Axially spring pressed (277/175)
FOR 180  DF  .~ Additional member (277/176)
FOR 181  DF  .~ Elastomeric (277/177)
FOR 182  DF  INTERFITTING WITH RADIALLY PROJECTING FLANGE (277/178)
FOR 183  DF  EMBEDDED REENFORCEMENT OPPOSING TAPERED MOUNTED SURFACE (277/179)
FOR 184  DF  WITH COMPRESSION STOP (277/180)
FOR 185  DF  PACKING ATTACHED RETAINER (277/181)
FOR 186  DF  .~ Peripheral shell (277/182)
FOR 187  DF  .~.~ With radial mounting flange (277/183)
FOR 188  DF  .~.~ Channel-shaped (277/184)
FOR 189  DF  .~ Plural at axially opposed ends (277/185)
FOR 190  DF  .~ Resilient (277/186)
FOR 191  DF  PACKING CHAMBER OR SEAT WITH SEPARABLE END WALL (277/187)
FOR 192  DF  WITH AXIALLY RELATED BACKING OR RETAINING MEMBER (277/188 R)
FOR 193  DD  .~ With anti-extrusion rings (277/188 A)
FOR 194  DF  WITH ANCHOR OR RETAINER (277/189)
FOR 195  DF  COMPOSITE SEAT (277/189.5)
FOR 196  DF  WEDGING PORTIONS (277/190)
FOR 197  DF  .~ Enclosed (277/191)
FOR 198  DF  SEGMENTAL (277/192)
FOR 199  DF  .~ Axially related segments (277/193)
FOR 200  DF  .~.~ L-shaped (277/194)
FOR 201  DF  .~.~ With radially related segment (277/195)
FOR 202  DF  .~.~ Coiled or corrugated segment (277/196)
FOR 203  DF  .~.~ Diametrically opposed splits (277/197)
FOR 204  DF  .~ Concentric segments (277/198)
FOR 205  DF  .~ Interfitting segments (277/199)
FOR 206  DF  AXIALLY SPACED FLANGES WITH CORRUGATED CONNECTING WEB (277/200)
FOR 207  DF  ANNULUS WITH DUCT OR PASSAGEWAY (277/201)
FOR 208  DF  .~ Elongated (277/202)
FOR 209  DF  HELICAL (277/203)
FOR 210  DF  VOLUTE (277/204)
FOR 211  DF  FLEXIBLE U- OR V-CUP (277/205)
FOR 212  DF  .~ Radially facing (277/206 R)
FOR 213  DD  .~.~ X-shape (277/206 A)
FOR 214  DF  RIBBED CONTACT SURFACE (277/207 R)
FOR 215  DF  .~ Axially spaced (277/208)
FOR 216  DF  .~.~ Opposite surfaces (277/209)
FOR 217  DF  .~.~.~ Line contact (277/210)
FOR 218  DF  .~ Opposite surfaces (277/211)
FOR 219  DD  .~ Pipe joints or connections (277/207 A)
FOR 220  DF  FLEXIBLE CUP OR FLANGE TYP(277/212R)
FOR 221  DD  .~ Flexible cup type (277/212 C)
FOR 222  DD  .~ Flange (277/212 F)
FOR 223  DD  .~ Flexible boot (277/212 FB)
FOR 224  DF  CORRUGATED CONTACT SURFACE (277/213)
FOR 225  DF  CIRCUMFERENTIAL GROOVE IN PERIPHERAL SURFACE (277/214)
FOR 226  DF  WITH SPACED POCKETS, GROOVES, OR RECESSES (277/215)
FOR 227  DF  SPLIT ANNULUS (227/216)
FOR 228  DF  .~ Variable radius (277/217)
FOR 229  DF  .~ With separate gap or bridging piece (277/218)
FOR 230  DF  .~.~ End secured (277/219)
FOR 231  DF  .~ With joining structure (277/220)
FOR 232  DF  .~.~ End-to-end tongue and slot (277/221)
FOR 233  DF  .~.~ Beveled or arcuate mating surfaces (277/222)
FOR 234  DF  .~ With insert (277/223)
FOR 235  DF  .~.~ Hard material (277/224)
FOR 236  DF  WITH INTERMEDIATE RADIAL PERIPHERAL FLANGE (277/225)
FOR 237  DF  FLUENT OR VACUUM CORE (277/226)
FOR 238  DF  COMPOSITE (277/227)
FOR 239  DF  .~ Elastomeric core (277/228)
FOR 240  DF  .~ Distinct sheath (277/229)
FOR 241  DF  .~.~ Woven or braided strands (277/230)
FOR 242  DF  .~ Reentrant contact surface (277/231)
FOR 243  DF  .~.~ Enclosing plural plies (277/232)
FOR 244  DF  .~ Plural planar or conical plies (277/233)
FOR 245  DF  .~.~ Metal faced (277/234)
FOR 246  DF  .~ Including metal (277/235 R)
FOR 247  DD  .~.~ Planar coating (277/235 A)
FOR 248  DD  .~.~ Engine gasket (277/235 B)
FOR 249  DF  METALLIC (277/236)
FOR 250  DF  MISCELLANEOUS (277/237 R)
FOR 251  DD  .~ Dust guard (277/237 A)