Evolution of the Lightbulb

Main

Joseph Swan receives a patent for an incandescent bulb

1869

Edison works on incandescent bulbs

1878 - 1880

Edison begins to work on incandescent bulbs

1878

Edison patents a bulb

1879

Joseph Swan, a British inventor, sues Edison for patent infringement

1882

Edison has the same model of bulb that Swan made 10 years before.

1882

Edison has to work with Swan as a consequence.

1882