D. V. Keller Jr.

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Lafayette, NY, US

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Patents Grantslast 30 patents

Information Patent Grant
Methods of and apparatus for hydrocarbon recovery
- Patent number 4,027,731
- Issue date Jun 7, 1977
- Otisca Industries, Ltd.
- Clay D. Smith
- E21 - EARTH DRILLING MINING
Information Patent Grant
Separation of hydrocarbonaceous substances from mineral solids
- Patent number 3,941,679
- Issue date Mar 2, 1976
- OTISCA Industries Ltd.
- Clay D. Smith
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL