2227989

Information

• Patent Grant
• 2227989

• References
• Source

• Patent Number

  2,227,989

• Date Filed

  Not available

• Date Issued

  Tuesday, January 7, 1941
  84 years ago

• CPC

  • H02H3/422 - using homopolar quantities
  • H02H1/04 - Arrangements for preventing response to transient abnormal conditions

• US Classifications

  • 361 - Electricity: electrical systems and devices