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| Patents for William H. Petit | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,034,441 | Mar. 17, 1936 | E.S. Hineline, W.H. Petit | Art or Method of Accurately Photographing Upon Film Strips Having Nonsensitized Ends | cameras | |
| 2,123,151 | Jul. 05, 1938 | E.S. Hineline, W.H. Petit | Method of Photographically Recording Voting Machine Indications | cameras | |