P

Inventor

SCHAEPER GARY R

US13 patents
⚠️ This page may combine multiple inventors who share the name “SCHAEPER GARY R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

NL INDUSTRIES INC

4 patents
US4602794AJul 29, 1986

Annular blowout preventer with upper and lower spherical sealing surfaces and rigid translation element

NL INDUSTRIES INC22 citations81
US4283039AAug 11, 1981

Annular blowout preventer with upper and lower spherical sealing surfaces

NL INDUSTRIES INC21 citations81
US4460149AJul 17, 1984

Annular blowout preventer with upper and lower spherical sealing surfaces

NL INDUSTRIES INC16 citations73
US4438900AMar 27, 1984

Locking mechanism for annular blowout preventer

NL INDUSTRIES INC19 citations73

CAMERON IRON WORKS INC

3 patents
US4579314AApr 1, 1986

Annular blowout preventer

CAMERON IRON WORKS INC19 citations81
US4580628AApr 8, 1986

Blowout preventer stacks and method of tensioning stack tie rods

CAMERON IRON WORKS INC18 citations73
US4460150AJul 17, 1984

Annular blowout preventer

CAMERON IRON WORKS INC17 citations68

COOPER IND INC

2 patents
US5005802AApr 9, 1991

Variable bore packer for a ram type blowout preventer

COOPER IND INC34 citations91
US5165704ANov 24, 1992

Blowout preventer bonnet seal carrier

COOPER IND INC14 citations72

SCHAEPER GARY R

2 patents
US7207382B2Apr 24, 2007

Shearing sealing ram

SCHAEPER GARY R48 citations90
US8444109B2May 21, 2013

Blowout preventer translating shaft locking system

SCHAEPER GARY R5 citations71

VENTRE CORP

1 patent
US4458876AJul 10, 1984

Annular blowout preventer

VENTRE CORP62 citations94

NAT OILWELL VARCO LP

1 patent
US9238950B2Jan 19, 2016

Blowout preventer with packer assembly and method of using same

NAT OILWELL VARCO LP4 citations72