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

• Current Assignee: Bernard A. Cousino
• Original Assignee: Bernard A. Cousino
• Inventors: Cousino, Bernard A.
• Application Number:
  US03/500,403
• Time in Patent Office: 869 Days
• US Class Current: 428/323
• CPC Class Codes: G11B 5/71 characterised by the lubricant
• CPC Class Codes: Y10S 428/90 Magnetic feature
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31971 Of carbohydrate

Claims

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.