Patents by Inventor Roger H. Sandvik

Roger H. Sandvik 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).

  • Fluid actuator
    Patent number: 4070946
    Abstract: The actuator piston has a generally cylindrical central projection about the exterior of which a similarly formed rolling diaphragm is closely fitted. The piston rod can turn freely, to avoid any twisting of the piston and diaphragm, and can also be axially withdrawn from its engagement with the piston. Return spring means extends into the diaphragm enclosed part of the piston.
    Type: Grant
    Filed: May 3, 1976
    Date of Patent: January 31, 1978
    Assignee: Design & Manufacturing Corporation
    Inventors: Roger H. Sandvik, Richard G. Huebscher