3609249

Information

• Patent Grant
• 3609249

• References
• Source

• Patent Number

  3,609,249

• Date Filed

  Not available

• Date Issued

  Tuesday, September 28, 1971
  53 years ago

• CPC

  • H04M9/002 - with subscriber controlled access to a line
  • H04Q1/30 - Signalling arrangements Manipulation of signalling currents

• US Classifications

  • 379 - Telephonic communications