Patents by Inventor Staaland, Torbjrn

Staaland, Torbjrn 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).

  • Single acting hydraulic actuator with variable return force
    Patent number: 4791856
    Abstract: A spring operated valve actuator with variable return force includes a compact spring mechanism with a short but very powerful closing characteristic. The energy provided by the spring mechanism is applied during the entire movement of the valve, with varying forces localized according to particular needs. The spring mechanism and a movable piston member are mechanically and drivingly interconnected by a variable reduction mechanism.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: December 20, 1988
    Assignee: Skarpenord Control Systems A/S
    Inventors: Edgar Heim, Kurt Sande, Staaland, Torbjrn