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| Patents for John D. Rovick | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,167,146 | Jul. 25, 1939 | J.D. Rovick, J.C. Drader | Means for Finishing Gears | ||
| 2,245,654 | Jun. 17, 1941 | J.D. Rovick, J.C. Drader | Gear Lapping and Finishing Machine | ||
| 2,257,195 | Sep. 30, 1941 | J.D. Rovick | Internal Gear Finishing Machine | ||
| 2,270,741 | Jan. 20, 1942 | J.D. Rovick | Machine and Tool for Finishing Gears | ||