3559172

Information

• Patent Grant
• 3559172

• References
• Source

• Patent Number

  3,559,172

• Date Filed

  Not available

• Date Issued

  Tuesday, January 26, 1971
  54 years ago

• CPC

  • H04M3/12 - Marking faulty circuits "busy" Enabling equipment to disengage itself from faulty circuits; Using redundant circuits; Response of a circuit, apparatus or system to an error
  • H04L12/08 - Alloting numbers to messages Counting characters, words or messages

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 379 - Telephonic communications