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Ellen S. Schwartz
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Warren, MI, US
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last 30 patents
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Patent Grant
Oil life monitor for diesel engines
Patent number
6,327,900
Issue date
Dec 11, 2001
General Motors Corporation
John E. Mc Donald
F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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Patent Grant
Automatic engine oil change indicator system
Patent number
4,847,768
Issue date
Jul 11, 1989
General Motors Corporation
Ellen S. Schwartz
B60 - VEHICLES IN GENERAL
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Patent Grant
Automatic engine oil change indicator system
Patent number
4,742,476
Issue date
May 3, 1988
General Motors Corporation
Ellen S. Schwartz
G07 - CHECKING-DEVICES