On April 30, 1912, U.S. Patent No. 1,025,075 issued to Frank J. Schumann on a Vending-Machine, adapted for postage stamps or tickets — and yet we still wait on long lines to buy both.

On April 27, 1976, U.S. Patent No. 3,953,566 issued to Robert W. Gore on a Process for Producing Porous Products – Goretex.

On April 26, 1966, U.S. Patent No. 3,248,705 issued to James E Dammann and Edward J. Skiko, on an Automatic Editor — one of the first word processing systems.

On April 25, 1950, Erwin J. Schweitzer and Carmine Jordan received U.S. Patent No. 2,505,652 on the Tail Wheel Actuated Arresting Hook — that automatically deployed the tail hook with the landing gear to facilitate landing on an aircraft carrier.

On April 23, 1907, U.S. Patent No. 850978 issued to Ignatius Soares on a Nose Shaper.  Fortunately for plastic surgeons everywhere, Ignatius’ invention never caught on, because the user sure looks delighted.

On April 22, 1879, U.S. Patent No. 214,663 issued to William L Hunt on Improvement in Theater Appliances — the appliance in question being a human cannon.

On April 21, 1959, U.S. Patent No. 2,882,643 issued to Alexander G Jianas, John R, Dos Passos, Nicholas C. Spanos, and Gene Towne, on a Bubble Toy — a space age looking bubble gun.

On April 19, 1904, U.S. Patent No. issued to John A Fleming on a Device for Wireless Telegraphy (a wireless radio).

On April 18, 1911, U.S. Patent No. 990,191 issued to Carl Bosch, Ph.D. on a Process of Producing Ammonia.

On April 17, 1973, U.S. Patent No. 3,728,480 issued to Ralph H. Baer on a Television Gaming and Training Apparatus.  This product was marketed as the Magnavox Odyssey in 1972-1975.