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| Patents Granted on 1811-11-01 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,601X | Nov. 01, 1811 | S. Witherill, Jr. | Screening and separating in water the corroded parts of lead from the uncorroded parts in the process of making white lead | manufacturing potash | |
| 1,602X | Nov. 01, 1811 | S. Witherill, Jr. | Machine for separating the oxidated from the metallic lead in the process of manufacturing red lead and of the manner of using the machine | manufacturing potash | |