The plastic shirt collar was patented in the US by Walter Hunt.
Source
Samuel Hopkins was awarded the first US patent.
Inventor Phillip W Pratt obtained the patent for his sprinkler system designed to extinguish fires.
Arthur Schawlow & Charles Townes was granted the first patent for a laser.
The first idea of a fire escape was patented.
William B. Purvis patented the electric switch on railways that would shut off the electric supply after carriages pass the contact device.
