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| Patents for Potter-Parlin Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 590,134 | Sep. 14, 1897 | W.T. Johnston, E. Crawley, Jr. | Coffee Roasting Machine | coffee roasters | |
| 590,567 | Sep. 28, 1897 | W.T. Johnston, E. Crawley, Jr. | Coffee Roasting Machine | coffee roasters | |
| 615,252 | Dec. 06, 1898 | W.T. Johnston, E. Crawley, Jr. | Coffee Roasting Machine | coffee roasters | |