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Eli Whitney applied for a patent on 28 October, 1793. On 14 March, 1794 the patent was granted. However, the patent was not validated until 1807.
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No exact date available
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No exact dates available
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Submitted for ratification on 31 January, 1865
Ratified on 6 December, 1865 -
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Submitted for ratification on 13 June, 1866
Ratified on 9 July, 1868 -
Submitted for ratification on 26 February, 1869
Ratified on 3 February, 1870 -
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