3649778

Information

• Patent Grant
• 3649778

• References
• Source

• Patent Number

  3,649,778

• Date Filed

  Not available

• Date Issued

  Tuesday, March 14, 1972
  52 years ago

• CPC

  • H04Q5/24 - for two-party-line systems
  • H01J1/14 - characterised by the material

• US Classifications

  • 370 - Multiplex communications
  • 455 - Telecommunications