Loudspeaker

To the first loudspeaker

Period: Jan 1, 1861 to Jan 1, 1926

Johann Philipp Reis - Electric Loudspeaker developed

Oct 26, 1861

Loudspeaker was added to the world's first telephone, called the Reis telephone.

Alexander Graham Bell - Improved loudspeaker

Mar 7, 1876

Improved on by Ernst Siemens - German patent gotten

Dec 14, 1877

German inventor and industrialist. Founder of Siemens telecommunications company.
The patent received was for an 'electromechanical "dynamic" or moving-coil transducer".

Oliver Lodge - Moving Coil (Dynamic) Driver Speakers

Feb 1, 1898

Peter L. Jensen, Edwin Pridham - First Practical application of Dynamic Driver Speakers

Dec 24, 1915

Moving-coil loudspeaker

Dynamic Driver Speakers patented by Chester W. Rice, Edward W. Kellogg

Apr 1, 1925

First prototype in 1921. Patent filed April 1st, 1925.