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John C. Holden
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Duncan, OK, US
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last 30 patents
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Patent Grant
Wellbore circulating valve
Patent number
4,058,165
Issue date
Nov 15, 1977
Halliburton Company
John C. Holden
E21 - EARTH DRILLING MINING
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Patent Grant
Apparatus for testing oil wells
Patent number
3,964,305
Issue date
Jun 22, 1976
Halliburton Company
Gary Q. Wray
E21 - EARTH DRILLING MINING
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Patent Grant
Wellbore circulating valve
Patent number
3,930,540
Issue date
Jan 6, 1976
Halliburton Company
John C. Holden
E21 - EARTH DRILLING MINING