Plants Art From Old Light Bulbs

On December 13, 1904, Hungarian Sándor Just and Croatian Franjo Hanaman were granted a Hungarian patent (No. 34541) for a tungsten filament lamp, that lasted longer and gave a brighter light than the carbon filament. Tungsten filament lamps were first marketed by the Hungarian company Tungsram in 1904, so this type is often called Tungsram-bulbs in many European countries. Their experiments have also shown that the luminosity of bulbs that were filled up with an inert gas was higher. The tungsten filament outlasted all other types.
In 1906, the General Electric Company patented a method of making filaments from sintered tungsten and in 1911, used ductile tungsten wire for incandescent light bulbs.
In 1913, Irving Langmuir found that filling a lamp with inert gas instead of a vacuum resulted in twice the luminous efficacy and reduction of bulb blackening. In 1924, Marvin Pipkin, an American chemist, patented a process for frosting the inside of lamp bulbs without weakening them, and in 1947, he patented a process for coating the inside of lamps with silica.
In 1916, Hygrade, predecessor to Osram Sylvania, discontinued its refilling service for burned-out light bulbs and produced 11,000 new light bulbs per day.