P

Inventor

BOLLFRASS CHARLES A

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

HYDRIL CO

3 patents
US4928999AMay 29, 1990

Elastomeric guard seal for tubular connections

HYDRIL CO65 citations94
US4373754AFeb 15, 1983

Threaded connector

HYDRIL CO230 citations94
US4133095AJan 9, 1979

Treating, including induction heating of well pipe connections

HYDRIL CO11 citations72

BAKER HUGHES INC

2 patents
US5029906AJul 9, 1991

Method and apparatus for forming a ventable seal

BAKER HUGHES INC34 citations91
US4893844AJan 16, 1990

Tubular coupling with ventable seal

BAKER HUGHES INC41 citations91

THREAD TECHNOLOGY INTERNATIONA

1 patent
US4588213AMay 13, 1986

Threaded pipe connection

THREAD TECHNOLOGY INTERNATIONA60 citations87

(unassigned)

1 patent
US6925954B1Aug 9, 2005

Systems and methods for allowing underwater escape from a submarine

11 citations67