Spirit Level Patents (Class D10/69)
  • Spherical spirit level
    Patent number: D243931
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: April 5, 1977
    Inventors: Richard A. Pitkin, Stanley T. Beale
  • Level
    Patent number: D244837
    Type: Grant
    Filed: April 17, 1975
    Date of Patent: June 28, 1977
    Assignee: Libella Tool AB
    Inventors: Hans Kristian Thingstad, Horst Jurgensen
  • Golf tee level
    Patent number: D249657
    Type: Grant
    Filed: January 11, 1977
    Date of Patent: September 26, 1978
    Inventor: Leighton E. Griffiths
  • Ladder inclinometer
    Patent number: D249875
    Type: Grant
    Filed: July 23, 1976
    Date of Patent: October 10, 1978
    Inventors: Paul Bumbal, John V. Mizzi
  • Necklace
    Patent number: D252195
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: June 26, 1979
    Inventor: Herman S. Keys
  • Leveling instrument
    Patent number: D252500
    Type: Grant
    Filed: September 7, 1977
    Date of Patent: July 31, 1979
    Inventor: John F. Mason
  • Four way corner level
    Patent number: D253581
    Type: Grant
    Filed: June 30, 1977
    Date of Patent: December 4, 1979
    Assignee: Vy-Dawn, Inc.
    Inventor: Robert H. Vanderwerf
  • Frame leveler
    Patent number: D255434
    Type: Grant
    Filed: September 23, 1977
    Date of Patent: June 17, 1980
    Inventor: Larry K. Hanson
  • Spirit level vial container
    Patent number: D255504
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: June 24, 1980
    Assignee: Vy-Dawn, Incorporated
    Inventor: Robert H. Vanderwerf