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| Patents for I. Dreyfus | |||||
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| Picture | Number | Date | Patentee | Title | |
| 64,956 | May 21, 1867 | I. Dreyfus | Improvement in automatic lubricators | ||
| D3,434 | Mar. 30, 1869 | I. Dreyfus | Design for an oil-cup for journal-boxes | ||
 | 106,261 | Aug. 09, 1870 | I. Dreyfus | Improvement in lubricators | |
 | 109,118 | Nov. 08, 1870 | I. Dreyfus | Improvement in lubricators | |