Christopher E. Cunningham

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Edinburgh, GB

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Patents Grantslast 30 patents

Information Patent Grant
Down hole well tool with pressure relief chamber
- Patent number 5,259,451
- Issue date Nov 9, 1993
- FMC Corporation
- Richard Kent
- E21 - EARTH DRILLING MINING
Information Patent Grant
Metal-to-metal sealing pipe swivel joint
- Patent number 5,044,672
- Issue date Sep 3, 1991
- FMC Corporation
- Harold B. Skeels
- E21 - EARTH DRILLING MINING
Information Patent Grant
Well pipe hanger with metal sealing annulus valve
- Patent number 5,044,432
- Issue date Sep 3, 1991
- FMC Corporation
- Christopher E. Cunningham
- E21 - EARTH DRILLING MINING