3533070

Information

• Patent Grant
• 3533070

• References
• Source

• Patent Number

  3,533,070

• Date Filed

  Not available

• Date Issued

  Tuesday, October 6, 1970
  53 years ago

• CPC

  • H04Q9/06 - Calling by using amplitude or polarity of dc

• US Classifications

  • 340 - Communications: electrical
  • 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems