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John C. Todd
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Dallas, TX, US
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last 30 patents
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Patent Grant
Method and apparatus for producing viscous or waxy crude oils
Patent number
4,446,917
Issue date
May 8, 1984
John C. Todd
E21 - EARTH DRILLING MINING
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Patent Grant
Method and apparatus for steam generation at the bottom of a well bore
Patent number
4,237,973
Issue date
Dec 9, 1980
John C. Todd
E21 - EARTH DRILLING MINING
Information
Patent Grant
Electrode well for electrically heating a subterranean formation
Patent number
4,084,639
Issue date
Apr 18, 1978
Petro Canada Exploration Inc.
John C. Todd
E21 - EARTH DRILLING MINING
Information
Patent Grant
Method of producing viscous materials from subterranean formations
Patent number
4,084,637
Issue date
Apr 18, 1978
Petro Canada Exploration Inc.
John C. Todd
E21 - EARTH DRILLING MINING