2253340

Information

• Patent Grant
• 2253340

• References
• Source

• Patent Number

  2,253,340

• Date Filed

  Not available

• Date Issued

  Tuesday, August 19, 1941
  84 years ago

• CPC

  • H02P9/16 - due to variation of ohmic resistance in field circuit, using resistances switched in or out of circuit step by step
  • Y10T307/352 - With control of magnitude of current or power

• US Classifications

  • 322 - Electricity: single generator systems
  • 307 - Electrical transmission or interconnection systems