On June 1, 1869, U.S. Patent No. 90,646 issued to Thomas A. Edison on an Electric Vote Recorder.
On May 31, 1955, U.S. Patent No. 2,709,773 issued to Ivan A. Getting and Lee L Davenport on Remote Control System with Position Indicating Means.
On May 29, 1888, U.S. Patent No. 383,746, issued to Elijah McCoy on a Lubricator (the “Real McCoy”).
On May 28, 1940, U.S. Patent No. 2,202,199 issued to Edmund Germer on a Discharge Device (the Metal Vapor Lamp).
On May 27, 1930, U.S. Patent No. 1,760,820, issued to Richard Gurley Drew on Adhesive Tape (Scotch Tape).
On May 26, 1868, U.S. Patent No. 78,317 issued to Alfred Nobel in an Improved Explosive Compound (dynamite).
On May 25, 1948, U.S. Patent No. 2,442,141 issued to Andrew J. Moyer on a Method of Production of Penicillin.
On May 24, 1932, U.S. Patent No. 1,859,624, issued to Leroy R. Grumman on Retractable Landing Gear.
On May 23, 1905, U.S. Patent No. 790,537 issued to Emmie Alice Thayer and Emily Wailee Thayer on a Mirror Support.
On May 22, 1849, U.S. Patent No. 6,469 issued to Abraham Lincoln on a Manner of Buoying Vessels.