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