2804604

Information

• Patent Grant
• 2804604

• References
• Source

• Patent Number

  2,804,604

• Date Filed

  Not available

• Date Issued

  Tuesday, August 27, 1957
  66 years ago

• CPC

  • H04Q1/40 - whereby duration of pulse or interval between two pulses is variable

• US Classifications

  • 340 - Communications: electrical
  • 379 - Telephonic communications