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| Patents for Percy Oliver Ott | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,819,689 | Aug. 18, 1931 | P.O. Ott | Hydraulic Pump | hydraulic pumps | |
| 1,965,388 | Jul. 03, 1934 | P.O. Ott | Rotary Pump | rotary pumps | |
| 1,988,213 | Jan. 15, 1935 | P.O. Ott | Multiple Rotary Pump | rotary pumps | |