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| Patents for R. S. Gray | |||||
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| Number | Date | Patentee | Title | Type | |
| 634,541 | Oct. 10, 1899 | J.W. Raymond | Electric starting device for gas-engines | gas and gasoline engines | |
| 636,452 | Nov. 07, 1899 | J.W. Raymond | Starting device for gas-engines | gas and gasoline engines | |
| 636,453 | Nov. 07, 1899 | J.W. Raymond | Electric igniter for gas-engines | gas and gasoline engines | |