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Continuing patent application
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==Early history== <!-- Deleted image removed: [[Image:AI4.jpg|thumb|Example of early "Additional Improvement Patent" from 1838|200px]] --> From 1838 to 1861, inventors could file patent applications on improvements to their inventions. These were published as "additional improvement patents" and were given numbers preceded by "A.I.". About 300 of these patents were issued.<ref>{{Cite web|url=https://www.uspto.gov/web/offices/pac/mpep/s901.html|title=MPEP|website=www.uspto.gov}}</ref>
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