US Patent: 20X
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Manufacturing Gun Powder
Powder Mill for Manufacturing Gun Powder
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Patentee:
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| Henry Keyser (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Aug. 10, 1791 |
USPTO (New site tip)
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Joel Havens
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Description: |
| Only about 2,000 of the almost 10,000 documents were recovered.
Because of the Patent Office fire in Dec. 1836, little is known about this patent. There are no patent drawings available. This patent is in the database for reference only.
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