Patents Represented by Attorney C. L. Johnson

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  • Drill chuck
    Patent number: 4684139
    Abstract: A drill chuck having a cylindrical sleeve connected to its bevel gear element and a rearward part of the sleeve being rotatable on a cylindrical portion of the chuck body, the chuck body being formed with a number of localized swellings at the surface of the cylindrical portion to retain the sleeve in position, the swellings having been formed by plastic deformation of the metal of the body part.
    Type: Grant
    Filed: January 31, 1986
    Date of Patent: August 4, 1987
    Assignee: The Jacobs Manufacturing Company, Limited
    Inventor: George C. Derbyshire
  • Pressure relief device
    Patent number: 4676266
    Abstract: An improvement in a pressure relief device of the type used in a power transformer, the improvement consisting of a flat circular gasket fixedly mounted about its inner periphery, and having its outer periphery flexibly arranged for wiping contact with the inner surface of a cup-like valve member.
    Type: Grant
    Filed: January 7, 1982
    Date of Patent: June 30, 1987
    Assignee: Qualitrol Corporation
    Inventor: Wendell D. Johnson
  • Tool chest with retractable step
    Patent number: 4545628
    Abstract: A tool chest for mechanics tools which chest is movable on wheels and has a retractable step affording easy access to the topmost storage compartments when stepped upon by the tool chest user. The step is horizontally movable beneath the tool chest when not in use, and also is movable vertically so that it does not engage the floor when the tool chest is being moved.
    Type: Grant
    Filed: February 17, 1984
    Date of Patent: October 8, 1985
    Assignee: The Jacobs Manufacturing Co.
    Inventor: Clyde D. Richey
  • Combined pressure relief valve and clamp
    Patent number: D282393
    Type: Grant
    Filed: April 1, 1983
    Date of Patent: January 28, 1986
    Assignee: Qualitrol Corporation
    Inventor: Wendell D. Johnson
  • Mobile tool chest
    Patent number: D283263
    Type: Grant
    Filed: September 21, 1983
    Date of Patent: April 1, 1986
    Assignee: The Jacobs Manufacturing Company
    Inventor: Clyde Richey
  • Electronic temperature monitor
    Patent number: D287701
    Type: Grant
    Filed: June 27, 1984
    Date of Patent: January 13, 1987
    Assignee: Qualitrol Corporation
    Inventor: Joseph F. Foster