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| Patents for Pearl Ridenour | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,310,351 | Jul. 15, 1919 | V.R. Koontz | Emmert K1 "New Improved" Universal Vise | vises | |
| 1,353,048 | Sep. 14, 1920 | V.R. Koontz | Collapsible tap | taps and dies | |
| 1,356,867 | Oct. 26, 1920 | V.R. Koontz | Collapsible tap | taps and dies | |