2840797

Information

• Patent Grant
• 2840797

• References
• Source

• Patent Number

  2,840,797

• Date Filed

  Not available

• Date Issued

  Tuesday, June 24, 1958
  65 years ago

• CPC

  • H04Q9/08 - Calling by using continuous ac

• US Classifications

  • 370 - Multiplex communications
  • 178 - Telegraphy
  • 340 - Communications: electrical
  • 367 - Communications, electrical: acoustic wave systems and devices
  • 455 - Telecommunications