US Patent: AI7
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| Canal lock gate
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Patentee:
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| David Wilkinson (exact or similar names) - Cohoes, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Apr. 24, 1838 |
| Reissue Information: |
| Reissue of 9,660X (May 14, 1836) |
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Joel Havens
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Description: |
| Additional Improvement patents were issued between 1836 and 1861 and allowed patentees to make small improvements, extensions and clarifications to an earlier patent. As is the case for many AI patents, only the drawing is available. |
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