US Patent Class 137
FLUID HANDLING-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1  DF  PROCESSES {5}
15.1  DF  HIGHSPEED FLUID INTAKE MEANS (E.G., JET ENGINE INTAKE) {1}
38  DF  CONTROL BY CHANGE OF POSITION OR INERTIA OF SYSTEM {5}
47  DF  SPEED RESPONSIVE VALVE CONTROL {5}
59  DF  FREEZE CONDITION RESPONSIVE SAFETY SYSTEMS {3}
65  DF  COMBUSTION FAILURE RESPONSIVE FUEL SAFETY CUT-OFF FOR BURNERS {1}
67  DF  DESTRUCTIBLE OR DEFORMABLE ELEMENT CONTROLLED {2}
78.1  DF  AMBIENT CONDITION CHANGE RESPONSIVE {4}
803  DF  FLOW AFFECTED BY FLUID CONTACT, ENERGY FIELD OR COANDA EFFECT (E.G., PURE FLUID DEVICE OR SYSTEM) {11}
82  DF  PRESSURE MODULATING RELAYS OR FOLLOWERS {3}
87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
123  DF  SIPHONS {8}
154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
215  DF  BACK FLOW PREVENTION BY VACUUM BREAKING (E.G., ANTI-SIPHON DEVICES) {1}
219  DF  LARNER-JOHNSON TYPE VALVES; I.E., TELESCOPING INTERNAL VALVE IN EXPANDED FLOW LINE SECTION {2}
223  DF  INFLATABLE ARTICLE (E.G., TIRE FILLING CHUCK AND/OR STEM) {6}
234.6  DF  WITH VEHICLE GUIDE OR SUPPORT, E.G., SERVICE STATION
236.1  DF  DISTRIBUTION SYSTEMS INVOLVING GEOGRAPHIC FEATURES
237  DF  WITH CLEANER, LUBRICATION ADDED TO FLUID OR LIQUID SEALING AT VALVE INTERFACE {2}
247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
255  DF  PLURAL TANKS OR COMPARTMENTS WITH PARALLEL FLOW {8}
268  DF  WITH HOLDER FOR SOLID, FLAKY OR PULVERIZED MATERIAL TO BE DISSOLVED OR ENTRAINED
269  DF  CONVERTIBLE {3}
272  DF  HYDRANT TYPE {15}
309  DF  REVERSING VALVES - REGENERATIVE FURNACE TYPE {2}
312  DF  WITH LEAKAGE OR DRIP COLLECTING {2}
315  DF  WITH REPAIR, TAPPING OR ASSEMBLY MEANS {6}
330  DF  NON-VALVING MOTION OF THE VALVE OR VALVE SEAT {1}
334  DF  WITH HEATING OR COOLING OF THE SYSTEM {6}
342  DF  WITH FLUID SYSTEM SUPPORT FOR WORKMAN OR NON-SYSTEM MATERIAL
343  DF  WITH CASING, SUPPORT, PROTECTOR OR STATIC CONSTRUCTIONAL INSTALLATIONS {7}
383  DF  WITH LOCK OR SEAL {3}
386  DF  LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
454.2  DF  REMOVABLE VALVE HEAD AND SEAT UNIT {3}
455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
544  DF  WITH MEANS FOR SEPARATING SOLID MATERIAL FROM THE FLUID {5}
551  DF  WITH INDICATOR, REGISTER, RECORDER, ALARM OR INSPECTION MEANS {6}
560  DF  COMBINED
561 R  DF  SYSTEMS {32}
797  DF  FRANGIBLE
798  DF  WITH COUPLING {1}
800  DF  WITH CLOSURE
801  DF  FAUCETS AND SPOUTS
802  DF  MISCELLANEOUS
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CROSS-REFERENCE ART COLLECTIONS
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900  DF  BUMPLESS MANUAL TO AUTOMATIC RELAYS
901  DF  BIASED BALL VALVES WITH OPERATORS
902  DF  SLUSH PUMP CHECK VALVES
903  DF  RUBBER VALVE SPRINGS
904  DF  CUSHION CHECK VALVES
905  DF  ROTARY VALVES FOR MULTIPLE GAS BURNERS
906  DF  VALVES BIASED BY FLUID "SPRINGS"
907  DF  VACUUM-ACTUATED VALVES
908  DF  RESPIRATOR CONTROL
909  DF  MAGNETIC FLUID VALVE
910  DF  DESTRUCTIBLE OR DEFORMABLE ELEMENT CONSTRUCTED OF SPECIFIC MATERIAL