Inventor
PERKINS DONALD H
US14 patents
⚠️ This page may combine multiple inventors who share the name “PERKINS DONALD H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
OTIS ENG CO
10 patentsUS5293551AMar 8, 1994
Monitor and control circuit for electric surface controlled subsurface valve system
OTIS ENG CO127 citations97
US4981173AJan 1, 1991
Electric surface controlled subsurface valve system
OTIS ENG CO119 citations96
US4886114ADec 12, 1989
Electric surface controlled subsurface valve system
OTIS ENG CO81 citations96
US4798247AJan 17, 1989
Solenoid operated safety valve and submersible pump system
OTIS ENG CO69 citations96
US5275038AJan 4, 1994
Downhole reeled tubing inspection system with fiberoptic cable
OTIS ENG CO93 citations95
US5070595ADec 10, 1991
Method for manufacturing electrIc surface controlled subsurface valve system
OTIS ENG CO46 citations92
US4582134AApr 15, 1986
Well packer
OTIS ENG CO34 citations92
US4512399AApr 23, 1985
Well packer
OTIS ENG CO27 citations92
US4413677ANov 8, 1983
Dual string well packer
OTIS ENG CO21 citations81
US4738431AApr 19, 1988
Ball valve structure
OTIS ENG CO15 citations73