Henry Blair was the second black inventor to receive a patent the first was Thomas Jennings who received a patent in 1821 for a dry cleaning process.
Henry Blair signed his patents with an "x" because he could not write. Henry Blair died in 1860.
The Research of Henry BakerWhat we know about early black inventors comes mostly from the work of Henry Baker. He was an assistant patent examiner at the U.S. Patent Office who was dedicated to uncovering and publicizing the contributions of Black inventors.
Around 1900, the Patent Office conducted a survey to gather information about black inventors and their inventions. Letters were sent to patent attorneys, company presidents, newspaper editors, and prominent African Americans. Henry Baker recorded the replies and followed-up on leads. Bakers research also provided the information used to select Black inventions exhibited at the Cotton Centennial in New Orleans, the Worlds Fair in Chicago, and the Southern Exposition in Atlanta. By the time of his death, Henry Baker had compiled four massive volumes.