Inventor

MASON CHARLES E

3 patents

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

CONOCO INC

2 patents

US4247312AJan 27, 1981

Drilling fluid circulation system

CONOCO INC98 citations92

US4498532AFeb 12, 1985

Pump down tool and check valve

CONOCO INC23 citations77

CONTINENTAL OIL CO

1 patent

US4098415AJul 4, 1978

Method for rotating hose

CONTINENTAL OIL CO5 citations58