Arthur Schawlow & Charles Townes was granted the first patent for a laser.
Source
John Burr patented a better rotary blade lawn mower, designed with traction wheels and a rotary blade that would not easily get stuck with grass clipping.
John Hampton patented the Venetian blind.
The first US fire extinguisher patent was granted to Alanson Crane, Virginia.
George Westinghouse Jr. patented steam power brake devices in the US.
Thomas J Martin patented the fire extinguisher.
