Patents by Inventor John K. Richardson

John K. Richardson 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).

  • Crane safety device
    Patent number: 4252243
    Abstract: A crane has a hoist rope which passes over a boom to a drum driven by a hudraulic motor and including a brake. The crane includes means for releasing the brake when the free end of the rope is a given distance below the crane, and has means for relieving hydraulic pressure from the motor in response to the horizontal radius of the free end of the rope so that at a given radius the motor can lift only a given maximum load.
    Type: Grant
    Filed: January 12, 1979
    Date of Patent: February 24, 1981
    Assignee: Priestman Brothers Limited
    Inventors: Frank M. Robinson, John K. Richardson
  • Roller bearings
    Patent number: 3967867
    Abstract: The invention concerns a bearing assembly having inner and outer bearing rings and two axially spaced coaxial annular passageways between said bearing rings and a number of rollers retained within said passageways, some of said rollers being inclined in one sense to the axis of said bearing and the others of said rollers being inclined in the opposite sense to said bearing axis.
    Type: Grant
    Filed: January 7, 1975
    Date of Patent: July 6, 1976
    Assignee: Priestman Brothers Limited
    Inventor: John K. Richardson