TDIPH Archives - Page 12 of 21

This Day in Patent History - On December 28, 1976, Patent # 4,000,000 was issued in to Robert Mendenhall for a process for recycling asphalt compositions

This Day in Patent History – On December 28, 1976, Patent # 4,000,000 was issued in to Robert Mendenhall for a process for recycling asphalt…

This Day in Patent History - On December 26, 1933, Edwin Armstrong was granted a patent for a two-path FM radio

On December 26, 1933, Edwin Armstrong was granted a patent for a two-path FM radio. He has been called “the most prolific and influential inventor…

This Day in Patent History - On December 25, 2007, a patent was granted for this Christmas ornament that displays a string of Christmas lights on a spinning upper hub

On December 25, 2007, a patent was granted for this Christmas ornament that displays a string of Christmas lights on a spinning upper hub. …

This Day in Patent History - On December 24, 1928, Gulbransen Company was granted a patent for a piano

This Day in Patent History – On December 24, 1928, Gulbransen Company was granted a patent for a piano. Gulbransen is notable for several innovations…

This Day in Patent History - On December 23, 1879, Thomas Edison patented Magneto-Electric Machine

On December 23, 1879, Thomas Edison patented Magneto-Electric Machine. The invention helps increase the effectiveness of the revolving armature. …

This Day in Patent History - On December 22, 1891, a patent was granted for Toilet-paper roll

On December 22, 1891, a patent was granted for Toilet-paper roll. This 124-year-old patent solves the ‘over versus under’ toilet paper roll debate. According to…

This Day in Patent History - On December 21, 1839, S. Barnard patented a mode of constructing portable houses for emigrants

On December 21, 1839, S. Barnard patented a mode of constructing portable houses for emigrants. …

This Day in Patent History - On December 18, 1900, Cleophas Monjeau filed a patent for an apparatus for purifying water

On December 18, 1900, Cleophas Monjeau filed a patent for an apparatus for purifying water. The three-tiered filter was made up of vegetation on top,…