Today's Articles

People, Locations, Episodes

Tue, 07.23.1889

First Lock Improvement is Patented

Lock Blueprint

On this date in 1889, W. A. Martin, African American inventor, patented the lock. This device was an improvement over the 4000-year-old bolt invented by the Chinese.

Martin's lock consisted of a cylinder and spiral spring, coiled around a metal pin. It was the forerunner of modern door locks.

The Patent number is #407,738 7/23/1889

U.S. Patent and Trademark Office
Mail Stop USPTO Contact Center
P.O. Box 1450
Alexandria, VA 22313

Global Black Inventors

New Poem Each Day

Poetry Corner

Those days when it was all right to be a criminal, or die, a postman's son, full of hallways and garbage, behind the hotdog store or in the parking... LETTER TO E. FRANKLIN FRAZIER. by Amiri Baraka (LeRoi Jones).
Read More