Patents by Inventor Leonard G. Sutherland

Leonard G. Sutherland 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).

  • Scissor lift
    Patent number: 5722513
    Abstract: A scissor lift has a pair of leg assemblies pivotally connected to a base. Relative movement between the legs and the base is opposed by spring assemblies that may be selectively connected to a carriage to vary the bias on the legs. A cam member secured to the leg acts on the carriage to modify the motion between the leg and the carriage to maintain a uniform vertical spring rate.
    Type: Grant
    Filed: June 20, 1995
    Date of Patent: March 3, 1998
    Assignee: Pentalift Equipment Corporation
    Inventors: Richard T. Rowan, Leonard G. Sutherland, Gary Cooke, Paul A. Pedersen