John Robert Herold

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Cypress, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Tool protection guide
- Patent number 5,896,925
- Issue date Apr 27, 1999
- FMC Corporation
- Gerald Brian Swagerty
- E21 - EARTH DRILLING MINING
Information Patent Grant
Retrieval tool for back pressure valve and tree test plug
- Patent number 5,782,297
- Issue date Jul 21, 1998
- FMC Corporation
- Martin L. Samuels
- E21 - EARTH DRILLING MINING
Information Patent Grant
Tool protection guide with energy absorbing bumper
- Patent number 5,730,218
- Issue date Mar 24, 1998
- FMC Corporation
- Gerald Brian Swagerty
- E21 - EARTH DRILLING MINING
Information Patent Grant
Wellhead retrieval tool assembly
- Patent number 5,474,124
- Issue date Dec 12, 1995
- Martin L. Samuels
- E21 - EARTH DRILLING MINING