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| Patents for Otto Kromer | |||||
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| Number | Date | Patentee | Title | Type | |
| 87,586 | Mar. 09, 1869 | O. Kromer, C. Ohlemacher | Improvement in dovetailing-machine | dovetailing machines | |
| 278,025 | May 22, 1883 | O. Kromer, F. Rinkleff | Spoke lathe | pattern lathes | |
| 333,016 | Dec. 22, 1885 | O. Kromer | Double reversible lathe | pattern lathes | |
| 336,813 | Feb. 23, 1886 | O. Kromer | Spoke lathe | pattern lathes | |
| 422,809 | Mar. 04, 1890 | O. Kromer | Spoke lathe | pattern lathes | |