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| Patents for Nicolaus August Otto | |||||
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| Number | Date | Patentee | Title | Type | |
| 433,813 | Aug. 05, 1890 | N.A. Otto | Gas or Oil Motor Engine | oil engines | |
| 433,814 | Aug. 05, 1890 | N.A. Otto | Gas or Oil Motor Engine | oil engines | |
| 437,507 | Sep. 30, 1890 | N.A. Otto | Petroleum or Oil Motor Engine | oil engines | |
| 437,508 | Sep. 30, 1890 | N.A. Otto | Gas or Motor Engine | ||