On April 10, 1849, U.S. Patent No. 6281 issued to William Hunt on a pin – the first safety pin.
Category Archives: Patent of the Day
April 9 Patent of the Day
On April 9, 2002, U.S. Patent No. 6,368,277, to Steven Olson on a Method of Swinging on a Swing.
Unfortunately for young Mr. Olson, the Commissioner ordered reexamination of his patent, and the claims were found to be unpatentable.
April 8 Patent of the Day
On April 8, 1873, U.S. Patent No. 137,564 issued to Alfred Paraf on an Improvement in Purifying and Separating Fats.
April 7 Patent of the Day
On April 7, 1896, U.S. Patent No. 557,835 issued to Simon Lake on a Submarine Locomotive – a submarine.
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.
