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| Patents for Oscar U. Zerk | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,697,217 | Jan. 01, 1929 | O.U. Zerk | Lubricant Fitting | |
 | 1,748,819 | Feb. 25, 1930 | O.U. Zerk | Lubricating Coupler | |
| 1,883,282 | Oct. 18, 1932 | O.U. Zerk | Lubicating Apparatus | ||