2784393

Information

• Patent Grant
• 2784393

• References
• Source

• Patent Number

  2,784,393

• Date Filed

  Not available

• Date Issued

  Tuesday, March 5, 1957
  68 years ago

• CPC

  • G08C19/14 - using combination of fixed frequencies
  • G08C15/10 - the signals being represented by frequencies or phase of current or voltage in transmission link
  • H04J3/17 - in which the transmission channel allotted to a first user may be taken away and re-allotted to a second user if the first user becomes inactive
  • H04J3/24 - in which the allocation is indicated by an address the different channels being transmitted sequentially
  • H04L27/26 - Systems using multi-frequency codes

• US Classifications

  • 340 - Communications: electrical
  • 379 - Telephonic communications