James H Mason patented the first US coffee percolator.
Source
John B. Meyenberg from St. Louis, Missouri, patented powdered milk.
Willis Carrier invented the world's first electronic air conditioner.
The lie detector, invented in 1921 by John Augustus Larson, was first used in the Netherlands.
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.
Inventor Elisha Otis acquired a patent for a steam engine for elevators.
