1989972

Information

• Patent Grant
• 1989972

• References
• Source

• Patent Number

  1,989,972

• Date Filed

  Not available

• Date Issued

  Tuesday, February 5, 1935
  90 years ago

• CPC

  • G01G23/362 - using electric contacts
  • Y10T307/773 - Light, heat, vibratory or radiant energy
  • Y10T307/951 - With time delay or retardation means
  • Y10T307/977 - Electrical actuator

• US Classifications

  • 318 - Electricity: motive power systems
  • 236 - Automatic temperature and humidity regulation
  • 307 - Electrical transmission or interconnection systems