Patents by Inventor William M. Johnson

William M. Johnson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Tool fastening
    Patent number: 4342166
    Abstract: A mounting bracket for fastening replaceable earth engaging tools such as rotary hoe blades or trench digger teeth in which the shaft of the tool fits within a recess in the bracket and a spring biased pin is arranged to pass through both the shaft and the bracket at right angles to the longitudinal dimension of the shaft. This arrangement does away with the need to use bolts.
    Type: Grant
    Filed: July 14, 1980
    Date of Patent: August 3, 1982
    Assignee: Ralph McKay Limited
    Inventors: William M. Johnson, Alan Lindsay, Harry Klaassens
  • Agricultural discs
    Patent number: 4305272
    Abstract: Agricultural discs are given a hardened annular run by providing a differential heat treatment. During the heat treatment step an annular ring of heat conductive material is placed on the outer periphery of the disc. Thus ensures that the outer edge is of greater hardness than the central portion of the disc.
    Type: Grant
    Filed: April 5, 1979
    Date of Patent: December 15, 1981
    Assignee: Ralph McKay Limited
    Inventor: William M. Johnson
  • Tillage discs
    Patent number: 4246971
    Abstract: An agricultural tillage disc having a replaceable annular blade. The central hub of the disc consists of two sections clamped together so that the inner edge of the annular blade is securely held therebetween.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: January 27, 1981
    Assignee: Ralph McKay Limited
    Inventor: William M. Johnson
  • Adaptor for an agricultural tine
    Patent number: D260772
    Type: Grant
    Filed: April 19, 1979
    Date of Patent: September 15, 1981
    Assignee: Ralph McKay Limited
    Inventors: William M. Johnson, Allan Lindsay
  • Agricultural tine
    Patent number: D262028
    Type: Grant
    Filed: March 9, 1979
    Date of Patent: November 24, 1981
    Assignee: Ralph McKay Limited
    Inventor: William M. Johnson