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, Albany County, 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 9,040X (Aug. 17, 1835) |
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Patent Pictures:
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USPTO (New site tip)
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Joel Havens
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Description: |
| In the United States, the term "Additional Improvement Patents" refers to a specific, historical category of patents used between 1837 and 1861. Under the Patent Act of 1836, an inventor could add improvements to their already existing patent rather than filing an entirely new application.
AI (Additional Improvements) patents were issued between 1836 and 1861 and only 318 were ever issued.
Only the patent drawing is available. |
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