On April 7, 1896, U.S. Patent No. 557,835 issued to Simon Lake on a Submarine Locomotive – a submarine.
Category Archives: Patent of the Day
April 6 Patent of the Day
On April 6, 1869, U.S. Patent No. 88,583 issued to William M. Parker on a Fire Extinguisher.
April 5 Patent of the Day
On April 5, 2006, U.S. Patent No. D518403 issued to Georgio Armani on a Necklace with Pendant.
April 4 Patent of the Day
On April 4, 1950, U.S. Patent No. 2,502,488, issued to William Shockley on a Semiconductor Amplifier — the transistor.
April 3 Patent of the Day
On April 3, 1973, U.S Patent No. 3,724,070 issued to Francis Dorion on a Dual Razor Blade Assembly.
April 2 Patent of the Day
On April 2, 1946, U.S. Patent No. 2,397,657 was issued to Robert H, Goddard for a Control Mechanism for Rocket Apparatus.
April 1 Patent of the Day
On April 1, 1969, U.S. Patent No. 3,435,826 issued to Thomas J. Fogarty on a Embolectomy Catheter — the balloon catheter.
March 31 Patent of the Day
On March 31, 1908, U.S. Patent No. 883,611 issued to Joseph Barad and Edward Markoff on a Device Employed for Exterminating Rats, Mice, and Other Animals — a better mousetrap! It puts a belled collar on the vermin so the cat can catch it.
March 30 Patent of the Day
On March 30, 2004, U.S. Patent No. 6,711,769 issued to Marielena Jane-Prats on a Pillow with Retractable Umbrella – perfect for spring break.
March 29 Patent of the Day
On March 29, 1983, U.S. Patent No. 4,378,116 issued to Erno Rubik on a Spatial Logical Toy, the Rubik’s Cube
