This patent started the era of shape-shifting furniture - This Day in Patent History On August 15, 1848, the first U.S. patent for a dental chair with adjustable elevation and tilt of the seat and back was issued to M.W. Hanchett…
This Day in Patent History - On November 10, 1998, Ethicon patented an electrosurgical device for welding tissue to control bleeding during surgical procedures On November 10, 1998, Ethicon patented an electrosurgical device for welding tissue to control bleeding during surgical procedures. …
