On February 21, 1865, U.S. Patent No. 46,454 issued to John Deere on a Plow:
February 20 Patent of the Day
On February 20, 1872, Silas Noble and James P. Cooley were issued U.S. Patent No. 123,790 on an Improvement in Tooth-Pick Machines:
February 19 Patent of the Day
On February 19, 1878, Thomas A. Edison was issued U.S. Patent No. 200,521 on a Phonograph or Speaking Machine:
February 18 Patent of the Day
On February 18, 1879, U.S. Patent No. D11,023 issued to Auguste Bartholdi on a Statute (the Statute of Liberty):
February 17 Patent of the Day
On February 17, 1976, U.S. Patent No. 3,939,151 issued to Thomas Sheehan for Displacement of the Thiazolidine Ring in Penicillin with the Formation of a Biologically Active Cephem System — a synthetic Penicillin.
February 16 Patent of the Day
On February 16, 1993, Kyle Gorka and Curt Smith were issued U.S. Patent No. 5,186,196 on a Beverage Shader:
February 15 Patent of the Day
On February 15, 1955, U.S. Patent No. 2,702,035 issued to John H. Gibbon, Gustav V.A. Malmros, and Edmund A Barber, Jr., on an Oxygenating Unit for Extracorporeal Circulation Devices (the heart/lung machine).
February 14 Patent of the Day
On February 14, 1871, U.S. Patent No. 111,798 issued to Thomas Adams on an Improvement in Chewing-Gum. 
Adams conceived the idea while working as a secretary to former Mexican leader Santa Anna, who chewed a natural gum called chicle. After failing to turn it to a rubber suitable for tires, he made the chicle into a chewing gum called Chiclets.
February 13 Patent of the Day
On February 13, 1906, Alfred Einhorn was issued U.S. Patent No. 812,544 on Alkamin Esters of Para-Aminobenzoic Acid or Procain. which was marketed under the brand NOVOCAIN. As Alfred described it:
February 12 Patent of the Day
On February 12, 1884, Louis E. Waterman was issued U.S. Patent No. 293,545 on the Fountain Pen.
