The New York Stock Exchange is not open on weekends. Stock Exchanges in America, Europe, and Asia follow the typical Monday to Friday schedule. However, in the Middle East the work week typically runs from Sunday through Thursday.
Thomas L. Jennings (1791 â February 12, 1856) was an African-American tradesman and abolitionist in New York City, New York. He operated and owned a tailoring and dry-cleaning business, and, on March 3,1821, he was granted patent 3306x for a dry scrub process as the first African American to be granted a patent.
Despite these constraints, there were a number of successful black inventors whose inventions proved useful and important. Thomas Jennings, the first known African American to hold a patent, used the money he earned from his invention to fund abolitionist causes.