APPENDIX

Patents Issued to Laurens Hammond Date of U, S. Patent

Date Patent No. Description

     

1907

(France)

Automatic gearshift for automobiles

1912

1,015,886

Differential mercury barometer

1920

1,345,767

Heat seal

1922

15,299 (Reissue) Tickless clock

1922

1,435,520 Teleview - stereoscopic motion pictures

1924

1,481,006 Shadow graph

1924

1,506,524 Stereoscopic motion picture device

1928

1,686,854 Stereoscopic picture-viewing apparatus

1929

1,719,805 Alternating current clock

1930

1,744,268 Electrolytic condenser structure

1930

1,858,947 Battery eliminator

1931

1,796,649 Alternating current clock

1931

1,797,912 Alternating current clock

1932

1,867,315 Synchronous electric motor

1932

1,873,397 method of making stator and rotor plates

1932

1,889,729 Card table with automatic dealing mechanism

1933

1,915,090 Synchronous electric phonograph motor

1933

1,924,606 Electrolytic condenser

1933

1,924,853 Alternating current clock

1934

1,956,350 Electric organ - first patent (used a crank to start it then!)

1934

1,960,672 Frequency-indicating and control apparatus so power plants will

keep on time keep clocks right!

1934

1,964,914 Card-feeding device (filed 1932)

1935

1,998,672 Card, table

1935

2,003,116 Electric clock motor

1935

2,013,208 Electric clock

1936

2,027,531 Electric alarm clock

1936

2,042,337 Electric calendar clock (filed 1931)

1937

2,067,708 Electric clock, self-starting

1937

2,080,371 Self-starting mechanism for electric clock

1937

2,099,204 Multiple key switches for organ

1938

2,117,002 Keyboard for musical instruments

1938

2,126,464 Electric piano

1938

2,126,682 Novachord

1939

2,159,505 Electric organ - improvements

1939

2,161,706 Electric organ - gradual attack

1939

2,184,424 Electric piano - key action

1940

2,199,702 Method of broadcasting signals from an organ

   

 
   
Appendix II    Index