3787637

Information

• Patent Grant
• 3787637

• References
• Source

• Patent Number

  3,787,637

• Date Filed

  Not available

• Date Issued

  Tuesday, January 22, 1974
  51 years ago

• CPC

  • H04M3/4874 - Intercept announcements
  • G11B5/004 - Recording on, or reproducing or erasing from, magnetic drums
  • H04M3/487 - Arrangements for providing information services

• US Classifications

  • 360 - Dynamic magnetic information storage or retrieval
  • 369 - Dynamic information storage or retrieval
  • 379 - Telephonic communications