1720555

Information

• Patent Grant
• 1720555

• References
• Source

• Patent Number

  1,720,555

• Date Filed

  Not available

• Date Issued

  Tuesday, July 9, 1929
  95 years ago

• CPC

  • H02P1/34 - by progressive reduction of impedance in secondary circuit
  • Y10S388/921 - Timer or time delay means
  • Y10T307/76 - Selectively actuated

• US Classifications

  • 388 - Electricity: motor control systems
  • 307 - Electrical transmission or interconnection systems
  • 318 - Electricity: motive power systems