One group of prolific innovators, however, has been largely ignored by history: black inventors born or forced into American slavery. Though U.S. patent law was created with color-blind language to foster innovation, the patent system consistently excluded these inventors from recognition.

As a law professor and a licensed patent attorney, I understand both the importance of protecting inventions and the negative impact of being unable to use the law to do so. But despite patents being largely out of reach to them throughout early U.S. history, both slaves and free African-Americans did invent and innovate. ...

During the 17th and 18th centuries, America was experiencing rapid economic growth. Black inventors were major contributors during this era – even though most did not obtain any of the benefits associated with their inventions since they could not receive patent protection.

Slave owners often took credit for their slaves’ inventions. In one well-documented case, a black inventor named Ned invented an effective, innovative cotton scraper. His slave master, Oscar Stewart, attempted to patent the invention. Because Stewart was not the actual inventor, and because the actual inventor was born into slavery, the application was rejected.

Stewart ultimately began selling the cotton scraper without the benefit of patent protection and made a significant amount of money doing so. In his advertisements, he openly touted that the product was “the invention of a Negro slave – thus giving the lie to the abolition cry that slavery dwarfs the mind of the Negro. When did a free Negro ever invent anything?”