US Patent Class 166
WELLS-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
335  DF  SUBMERGED WELL {10}
244.1  DF  PROCESSES {39}
50  DF  WELLS WITH LATERAL CONDUITS
51  DF  MEANS FOR FORMING FILTER BEDS (E.G., GRAVEL PLACING)
52  DF  PLURAL WELLS
53  DF  AUTOMATIC {1}
54.1  DF  WITH MEANS FOR SEPARATELY PUMPING FROM PLURAL SOURCES IN WELL
54.5  DF  MEANS FOR CUTTING CABLE OR ROPE BELOW GROUND {1}
55  DF  MEANS FOR PERFORATING, WEAKENING, BENDING OR SEPARATING PIPE AT AN UNPREPARED POINT {3}
56  DF  SCREEN AND OUTSIDE CLEANING PIPE
57  DF  WITH HEATING, REFRIGERATING OR HEAT INSULATING MEANS {5}
63  DF  WITH EXPLOSIVE OR GAS GENERATING MEANS IN WELL
64  DF  WITH TIME OR DISTANCE MEASURING, TEMPERATURE RESPONSIVE OR COUNTING MEANS
65.1  DF  WITH ELECTRICAL MEANS {4}
67  DF  WITH BELOW AND ABOVE GROUND MODIFICATION {6}
75.11  DF  ABOVE GROUND APPARATUS {25}
98  DF  GRAPPLE AND WELL ANCHORED LIFTING MEANS
99  DF  WITH JUNK RETRIEVING MEANS
100  DF  LATERAL PROBE OR PORT SEALED AGAINST WELL WALL
101  DF  PACKER OR PLUG AND PUMP OR PLUNGER MEANS EXERTING OUTWARD PRESSURE
102  DF  CONVERTIBLE
104  DF  WITH MOTOR FOR ROTARY OR OSCILLATING MOTION
105  DF  WITH EDUCTION PUMP OR PLUNGER {5}
113  DF  COMBINED (E.G., WITH NON-ELECTRICAL INDICATING)
114  DF  CENTRAL MEMBER WITH PRE-SET PACKER OR PLUG IN SAME CONDUIT
115  DF  CENTRAL CHAMBER SEALED WITH RESPECT TO PREPOSITIONED MODIFIED SURROUNDING CONDUIT {1}
117  DF  RECEPTACLE OR PART THEREOF LEFT IN WELL
117.5  DF  MEANS FOR GUIDING INSERTABLE ELEMENT LATERALLY OF WELL AXIS (E.G., WHIPSTOCK) {1}
117.7  DF  MEANS ANCHORED AGAINST ROTATION IN ONE CONDUIT SECTION FOR RELATIVELY ROTATING ANOTHER SECTION
179  DF  PACKERS OR PLUGS {17}
153  DF  PISTONS, FLUID DRIVEN INTO WELL (E.G., CEMENTING PLUGS) {3}
157  DF  SCREEN WITH WASHING POINT OR SHOE {1}
162  DF  RECEPTACLES {7}
170  DF  BRUSHING, SCRAPING, CUTTING OR PUNCHING-TYPE CLEANERS {6}
177.1  DF  SONIC DEVICE {1}
177.3  DF  WIPER
177.4  DF  CEMENTING DEVICE
177.5  DF  HYDRAULIC FRACTURING DEVICE
177.6  DF  VIBRATOR
177.7  DF  AGITATOR
178  DF  WITH JAR MEANS FOR RELEASING STUCK PART
205  DF  SCREEN WITH VALVE, CLOSURE, CHANGEABLE RESTRICTOR OR PORTION REMOVABLE IN WELL
206  DF  EXPANSIBLE ANCHOR OR CASING {8}
222  DF  WHIRLING OR LATERAL DISCHARGE OR PROJECTABLE NOZZLES {1}
316  DF  VALVES, CLOSURES OR CHANGEABLE RESTRICTORS {5}
227  DF  SCREENS {7}
237  DF  DETENTS OR CLUTCHES {3}
241.1  DF  GUIDE FOR DEVICE OR CONDUIT {3}
242.1  DF  CONDUIT WALL OR SPECIFIC CONDUIT END STRUCTURE {7}
243  DF  MISCELLANEOUS (E.G., ANCHOR PIPES)
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CROSS-REFERENCE ART COLLECTIONS
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901  DF  WELLS IN FROZEN TERRAIN
902  DF  FOR INHIBITING CORROSION OR COATING