3221257

Information

• Patent Grant
• 3221257

• References
• Source

• Patent Number

  3,221,257

• Date Filed

  Not available

• Date Issued

  Tuesday, November 30, 1965
  59 years ago

• CPC

  • G05B11/013 - using discharge tubes

• US Classifications

  • 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems
  • 236 - Automatic temperature and humidity regulation
  • 318 - Electricity: motive power systems