3614329

Information

• Patent Grant
• 3614329

• References
• Source

• Patent Number

  3,614,329

• Date Filed

  Not available

• Date Issued

  Tuesday, October 19, 1971
  53 years ago

• CPC

  • H04M3/42 - Systems providing special services or facilities to subscribers
  • H04M7/08 - for phantom working
  • H04Q3/54 - in which the logic circuitry controlling the exchange is centralised

• US Classifications

  • 379 - Telephonic communications