1638825

Information

• Patent Grant
• 1638825

• References
• Source

• Patent Number

  1,638,825

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1927
  97 years ago

• CPC

  • H02P9/18 - the switching being caused by a servomotor, measuring instrument, or relay
  • Y10T307/812 - Differential speed between two bodies
  • Y10T307/937 - Switch actuation
  • Y10T307/977 - Electrical actuator

• US Classifications

  • 322 - Electricity: single generator systems
  • 307 - Electrical transmission or interconnection systems
  • 318 - Electricity: motive power systems
  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets