3638089

Information

• Patent Grant
• 3638089

• References
• Source

• Patent Number

  3,638,089

• Date Filed

  Not available

• Date Issued

  Tuesday, January 25, 1972
  53 years ago

• CPC

  • H02P7/2885 - whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
  • G11B19/28 - Speed controlling, regulating, or indicating
  • G11B23/505 - of disc carriers
  • H02P7/2913 - whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
  • Y10S388/912 - Pulse or frequency counter
  • Y10S388/922 - Tuned or resonant circuit

• US Classifications

  • 388 - Electricity: motor control systems
  • 318 - Electricity: motive power systems
  • 346 - Recorders
  • 360 - Dynamic magnetic information storage or retrieval
  • G9B - INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER