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Multiple sound tracks

  • US 2,950,971 A
  • Filed: 12/17/1957
  • Issued: 08/30/1960
  • Est. Priority Date: 12/17/1957
  • Status: Expired due to Term
First Claim
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1. A MULTIPLE SOUND TRACK MEANS COMPRISING A BASE FILM UNIFORMLY TRANSPARENT TO LIGHT OF THE INFA-RED PORTION OF THE LIGHT SPECTRUM, AN EMULSION HAVING AN OPTICAL SOUND IMAGE THEREIN DEPOSITED UPON ONE SURFACE OF SAID BASE FILM PROVIDING AN OPTICAL SOUND TRACK TO MODULATE THE LIGHT OF SAID INFRA-RED PORTION OF THE LIGHT SPECTRUM AND MEANS COMPRISING MAGNETIC IRON OXIDE IN A BINDER THAT IS UNIFORMLY TRANSPARENT TO THE LIGHT OF SAID INFRARED PORTION OF THE LIGHT SPECTRUM DEPOSITED UPON SAID BASE FILM IN SUPERPOSED RELATION TO SAID EMULSION FOR PROVIDING A MAGNETIC SOUND TRACK, SAID MAGNETIC IRON OXIDE SOUND TRACK HAVING A SLIGHTLY GREATER TRANSVERSE WIDTH THAN SAID OPTICAL SOUND TRACK SO AS TO EXTEND BEYOND THE EDGES OF SAID OPTICAL SOUND TRACK.

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