Assignee
PETRO DRIVE INC
US·4 granted patents·75 citations·filing 1979–1984
Technology mixE21B4
Top patents by PatentIndex Score
4 records- 0170US4258800AHinged conductor casing for deviated driving and method thereforPETRO DRIVE INC·Filed 1979·Granted Mar 31, 1981·31 cites·11 claims
- 0263US4446932AHydrostatic shear pinPETRO DRIVE INC·Filed 1981·Granted May 8, 1984·29 cites·10 claims
- 0342US4592422ACasing hanger apparatus and method of installation thereforPETRO DRIVE INC·Filed 1984·Granted Jun 3, 1986·12 cites·6 claims
- 0430US4469182AMethod of installing a casing hangerPETRO DRIVE INC·Filed 1982·Granted Sep 4, 1984·3 cites·5 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →