1820950

Information

• Patent Grant
• 1820950

• References
• Source

• Patent Number

  1,820,950

• Date Filed

  Not available

• Date Issued

  Tuesday, September 1, 1931
  93 years ago

• CPC

  • E04F21/1805 - Ceiling panel lifting devices
  • E04F21/1833 - spring-force actuated
  • Y10T74/20666 - Lever engaging
  • Y10T403/32459 - Retainer extends through aligned recesses
  • Y10T403/32991 - Axially spring-biased coaxial members

• US Classifications

  • 248 - Supports
  • 074 - Machine element or mechanism
  • 182 - Fire escape, ladder, or scaffold
  • 188 - Brakes
  • 403 - Joints and connections
  • 410 - Freight accommodation on freight carrier