2678435

Information

• Patent Grant
• 2678435

• References
• Source

• Patent Number

  2,678,435

• Date Filed

  Not available

• Date Issued

  Tuesday, May 11, 1954
  70 years ago

• CPC

  • H04L13/10 - Distributors
  • H04M19/02 - providing ringing current or supervisory tones

• US Classifications

  • 341 - Coded data generation or conversion
  • 361 - Electricity: electrical systems and devices
  • 370 - Multiplex communications