Inventor · disambiguated record
John V. Fredd
Also filed as: FREDD JOHN V
19 granted patents·632 citations·filing 1974–1984
96Inventor score
Top patents by PatentIndex Score
19 records- 0193US4160478AWell toolsOTIS ENG CO·Filed 1978·Granted Jul 10, 1979·105 cites·19 claims
- 0290US3994516ATelescoping pipe coupling with improved pressure seal connection threadsOTIS ENG CO·Filed 1975·Granted Nov 30, 1976·75 cites·9 claims
- 0386US4289165AEqualizing ball valve memberOTIS ENG CO·Filed 1979·Granted Sep 15, 1981·59 cites·27 claims
- 0484US4453599AMethod and apparatus for controlling a wellOTIS ENG CO·Filed 1982·Granted Jun 12, 1984·60 cites·34 claims
- 0581US4537383AValveOTIS ENG CO·Filed 1984·Granted Aug 27, 1985·54 cites·7 claims
- 0678US4230185ARod operated rotary well valveOTIS ENG CO·Filed 1978·Granted Oct 28, 1980·41 cites·3 claims
- 0776US4280561AValveOTIS ENG CO·Filed 1979·Granted Jul 28, 1981·39 cites·5 claims
- 0871US4274486AApparatus for and method of operating a wellOTIS ENG CO·Filed 1979·Granted Jun 23, 1981·31 cites·9 claims
- 0969US4252195AWell test systems and methodsOTIS ENG CO·Filed 1979·Granted Feb 24, 1981·28 cites·10 claims
- 1065US4216830AFlapper valveOTIS ENG CO·Filed 1978·Granted Aug 12, 1980·24 cites·16 claims
- 1162US4051899AReset and pulling tool for manipulating well safety valveOTIS ENG CO·Filed 1976·Granted Oct 4, 1977·23 cites·16 claims
- 1262US4033408AGo-devil storage and discharge assemblyCONTINENTAL OIL CO·Filed 1976·Granted Jul 5, 1977·26 cites·5 claims
- 1350US4117563AThread chaser tool for contiguous straight and tapered thread runsOTIS ENG CO·Filed 1976·Granted Oct 3, 1978·8 cites·5 claims
- 1448US3955624ASafety valve for controlling flow in a flow conductorCONTINENTAL OIL CO·Filed 1974·Granted May 11, 1976·17 cites·25 claims
- 1545US4252143AActuatorOTIS ENG CO·Filed 1979·Granted Feb 24, 1981·11 cites·7 claims
- 1643US4274485AMethod and system for well testingOTIS ENG CO·Filed 1979·Granted Jun 23, 1981·10 cites·14 claims
- 1743US4266614AValveOTIS ENG CO·Filed 1979·Granted May 12, 1981·10 cites·15 claims
- 1838US4252188AActuatorOTIS ENG CO·Filed 1979·Granted Feb 24, 1981·7 cites·7 claims
- 1933US4289201AWell test apparatusOTIS ENG CO·Filed 1979·Granted Sep 15, 1981·4 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →