Assignee
WALKER NEER MFG CO
21 granted patents·1,039 citations·filing 1975–1983
Top patents by PatentIndex Score
21 records- 0196US4280535AInner tube assembly for dual conduit drill pipeWALKER NEER MFG CO·Filed 1979·Granted Jul 28, 1981·99 cites·34 claims
- 0293US4403897ASelf-centering clamp for down-hole tubularsWALKER NEER MFG CO·Filed 1980·Granted Sep 13, 1983·110 cites·35 claims
- 0391US4403666ASelf centering tongs and transfer arm for drilling apparatusWALKER NEER MFG CO·Filed 1981·Granted Sep 13, 1983·96 cites·31 claims
- 0490US4475607AClamp and insert for clamping drilling tubularsWALKER NEER MFG CO·Filed 1981·Granted Oct 9, 1984·96 cites·18 claims
- 0590US4407629ALifting apparatus for down-hole tubularsWALKER NEER MFG CO·Filed 1980·Granted Oct 4, 1983·89 cites·20 claims
- 0687US4057118ABit packer for dual tube drillingWALKER NEER MFG CO·Filed 1975·Granted Nov 8, 1977·66 cites·10 claims
- 0783US4314611AApparatus for supporting and rotating a down hole tubularWALKER NEER MFG CO·Filed 1980·Granted Feb 9, 1982·44 cites·23 claims
- 0883US4303270ASelf-centering clampWALKER NEER MFG CO·Filed 1979·Granted Dec 1, 1981·66 cites·10 claims
- 0981US4509606AAxial return hammerWALKER NEER MFG CO·Filed 1983·Granted Apr 9, 1985·56 cites·7 claims
- 1080US4533055AStorage rack for drilling tubularsWALKER NEER MFG CO·Filed 1982·Granted Aug 6, 1985·48 cites·11 claims
- 1180US4168755ANutating drill bitWALKER NEER MFG CO·Filed 1977·Granted Sep 25, 1979·46 cites·18 claims
- 1280US4071101AStabilizer for single or dual tube drillingWALKER NEER MFG CO·Filed 1976·Granted Jan 31, 1978·47 cites·8 claims
- 1374US4366606ASelf-centering clamp for down-hole tubularsWALKER NEER MFG CO·Filed 1980·Granted Jan 4, 1983·44 cites·14 claims
- 1474US4037661AMethod and apparatus for cleaning a screened wellWALKER NEER MFG CO·Filed 1976·Granted Jul 26, 1977·37 cites·11 claims
- 1568US4522439AAutomatic pipe elevatorWALKER NEER MFG CO·Filed 1983·Granted Jun 11, 1985·36 cites·24 claims
- 1652US3978923AInjection sub for dual tube drillingWALKER NEER MFG CO·Filed 1975·Granted Sep 7, 1976·17 cites·5 claims
- 1751US4274497ASkirted hammer sub for dual tube drillingWALKER NEER MFG CO·Filed 1977·Granted Jun 23, 1981·15 cites·13 claims
- 1843US4511169ASelf locking and unlocking elevator assemblyWALKER NEER MFG CO·Filed 1982·Granted Apr 16, 1985·12 cites·24 claims
- 1941US4171187AAir injection subWALKER NEER MFG CO·Filed 1977·Granted Oct 16, 1979·9 cites·14 claims
- 2030US4407373ACollapsible pedestal for drilling apparatusWALKER NEER MFG CO·Filed 1981·Granted Oct 4, 1983·3 cites·7 claims
- 2122US4406098ADrilling rampWALKER NEER MFG CO·Filed 1981·Granted Sep 27, 1983·3 cites·17 claims
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