On May 20, 1873, U.S. Patent No. 139121 issued to Jacob W. Davis on Fastening Pocket-Openings (using rivets).

On May 19, 1896, U.S. Patent No. 560,351 issued to Martin Goetze on a Device for Producing Dimples.

On May 18, 1869, U.S. Patent No. 90,298 issued to Francis Peters and George Clem on Improvements in Privy-Seats.

On May 17, 1955, U.S. Patent No. 2,708,656 issued to Enrico Fermi and Leo Szilard on a Neutronic Reactor.

On May 16, 1933, U.S. Patent No. PP65 issued to Luther Burbank on a Rose.

On May 15, 1945, U.S. Patent No. 2,376,028 issued to Leo F. Buck on a Pig Racing Apparatus.

On May 14, 1963, U.S. Patent No. 3,089,670, issued to Elmer G. Johnson on a Solar Powered Vehicle (aircraft).

On May 13, 1980, U.S. Patent No. 4,202,396 issued to Abraham Levy on Motor Vehicles and Sunshields.

On May 12, 1925, U.S. Patent No. 1,537,879, issued to A.L. Putnam on  a Pneumatic Treated Vehicle Tire.

On May 11, 2016, U.S. Patent No. 5,901,666 issued to Brice Belisle on Pet Display Clothing.