1987992

Information

• Patent Grant
• 1987992

• References
• Source

• Patent Number

  1,987,992

• Date Filed

  Not available

• Date Issued

  Tuesday, January 15, 1935
  90 years ago

• CPC

  • H02P9/20 - due to variation of continuously-variable ohmic resistance

• US Classifications

  • 320 - Electricity: battery or capacitor charging or discharging
  • 290 - Prime-mover dynamo plants
  • 307 - Electrical transmission or interconnection systems
  • 322 - Electricity: single generator systems