3562436

Information

• Patent Grant
• 3562436

• References
• Source

• Patent Number

  3,562,436

• Date Filed

  Not available

• Date Issued

  Tuesday, February 9, 1971
  54 years ago

• CPC

  • H04M15/18 - according to duration of the call , or the communication

• US Classifications

  • 370 - Multiplex communications
  • 340 - Communications: electrical
  • 379 - Telephonic communications