1231991

Information

• Patent Grant
• 1231991

• References
• Source

• Patent Number

  1,231,991

• Date Filed

  Not available

• Date Issued

  Tuesday, July 3, 1917
  107 years ago

• CPC

  • H02J7/20 - due to variation of continuously variable ohmic resistor
  • Y10S320/36 - Distribution system

• US Classifications

  • 307 - Electrical transmission or interconnection systems
  • 315 - Electric lamp and discharge devices: systems
  • 320 - Electricity: battery or capacitor charging or discharging