Robert D. Donaldson Jr.

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Dallas, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Variable roller valve system for internal combustion engine
- Patent number 5,655,494
- Issue date Aug 12, 1997
- Three Star Enterprises, Inc.
- Robert D. Donaldson
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Variable roller valve system for internal combustion engine
- Patent number 5,572,967
- Issue date Nov 12, 1996
- Three Star Enterprises, Inc.
- Robert D. Donaldson
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES