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Magnetic sound tape

  • US 2,804,401 A
  • Filed: 04/11/1955
  • Issued: 08/27/1957
  • Est. Priority Date: 04/11/1955
  • Status: Expired due to Term
First Claim
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6. A METHOD OF TREATING A MAGNETIC RECORDING TAPE HAVING A CONTINUOUS FILM OF SYNTHETIC PLASTIC WITH A SMOOTH MAGNETIC SURFACE WHICH COMPRISES PROVIDING A VOLATILE LIQUID CARRIER HAVING MINUTELY DIVIDED GRAPHITE PARTICLESA DISPERSED THEREIN, APPLYING SAID CARRIER TO AT LEAST ONE FACE OF SAID TAPE, AND DRYING SAID TAPE TO LEAVE A COATING OF GRAPHITE ON SAID FACE.

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