3021556

Information

• Patent Grant
• 3021556

• References
• Source

• Patent Number

  3,021,556

• Date Filed

  Not available

• Date Issued

  Tuesday, February 20, 1962
  63 years ago

• CPC

  • E05F3/06 - in which a torsion spring rotates a member around an axis perpendicular to the axis of the piston
  • E05Y2900/132 - Doors
  • Y10S16/09 - Hydraulic actuated checks, closers
  • Y10T16/2774 - Floor pivot
  • Y10T16/53826 - Resiliently biased rolling or sliding cam surface
  • Y10T16/5388 - Coil

• US Classifications

  • 016 - Miscellaneous hardware
  • 267 - Spring devices