Inventor

CROMWELL JOHN E

4 patents

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

KOPPERS CO INC

2 patents

US3938814AFeb 17, 1976

Bearing member having a wear resistant coating on its bearing face

KOPPERS CO INC40 citations89

US4176434ADec 4, 1979

Method of making piston rings with chrome-filled grooves

KOPPERS CO INC16 citations69

HYDE GLENN F

1 patent

US4334927AJun 15, 1982

Piston ring coatings

HYDE GLENN F27 citations76

CROMWELL JOHN E

1 patent

US4307890ADec 29, 1981

Piston ring with chrome-filled groove

CROMWELL JOHN E17 citations65