This Day in Patent History - On December 7, 1880, Alexander Graham Bell patented photophone, which allowed for the transmission of speech on a beam of light

On December 7, 1880, Alexander Graham Bell patented photophone, which allowed for the transmission of speech on a beam of light.

Bell believed the photophone was his most important invention. He said the photophone was “his greatest invention, greater than the telephone”.

PatentYogi_On December 7, 1880, Alexander Graham Bell patented photophone, which allowed for the transmission of speech on a beam of light

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Patent Information
Publication number: US235199 A
Patent Title: Alexander g
Publication type: Grant
Publication date: 7 Dec 1880
Filing date: 28 Aug 1880
Inventors: Alexander G. Bell

US235199

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