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| Patents for William E. Hale | |||||
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| Number | Date | Patentee | Title | Type | |
| 368,445 | Aug. 16, 1887 | C.W. Baldwin | Gas Engine | gas and gasoline engines | |
| 407,320 | Jul. 23, 1889 | C.W. Baldwin | Gas Engine | gas and gasoline engines | |
| 407,321 | Jul. 23, 1889 | C.W. Baldwin | Gas Engine | gas and gasoline engines | |
| 408,683 | Aug. 13, 1889 | C.W. Baldwin | Gas Engine | gas and gasoline engines | |