3871754

Information

• Patent Grant
• 3871754

• References
• Source

• Patent Number

  3,871,754

• Date Filed

  Not available

• Date Issued

  Tuesday, March 18, 1975
  50 years ago

• CPC

  • G03B21/323 - Cassettes
  • G03B31/02 - in which sound track is on a moving-picture film

• US Classifications

  • 352 - Optics: motion pictures
  • 226 - Advancing material of indeterminate length
  • 360 - Dynamic magnetic information storage or retrieval