Eli Whitney's Cotton Gin Patent

Background. A cotton gin—meaning "cotton engine"—is a machine that quickly separates cotton fibers from their seeds, enabling far greater productivity than manual separation. Earlier roller gins, used in the Indian subcontinent since around 500 A.D., handled only long-staple cotton; Hugo Krebs in 1772 and Joseph Eve in 1788 modified them, but short-staple cotton remained unprocessed until Whitney's 1793 development.

Invention at Mulberry Grove. Eli Whitney Jr. (December 8, 1765 – January 8, 1825) was an American inventor widely known for inventing the cotton gin in 1793. Catherine Greene invited Whitney to visit her Georgia plantation, Mulberry Grove, where he constructed ingenious household devices that led Greene to introduce him to businessmen discussing the desirability of a machine for processing cotton.

Patent and Aftermath. Whitney applied for the patent on October 28, 1793, and received it on March 14, 1794, later numbered X72, though it was not validated until 1807. He had hoped the invention would reduce the labor needed to process cotton, but it instead increased demand for laborers to harvest the crop, as picking became the bottleneck.