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| Patents for Rudolph Conrader | |||||
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| Picture | Number | Date | Patentee | Title | |
| 404,686 | Jun. 04, 1889 | R. Conrader | Grinding Machine | ||
| 498,240 | May 30, 1893 | R. Conrader | Reamer Grinding Machine | ||
| 513,632 | Jan. 30, 1894 | R. Conrader | Machine for Grinding Spherical or Other Curved Surfaces | ||
| RE11,593 | Mar. 23, 1897 | R. Conrader | Machine for Grinding Spherical or other Curved Surfaces | ||