Patents by Inventor William J. Roettger

William J. Roettger 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).

  • Spring return cylinder actuator
    Patent number: 4885981
    Abstract: A reversible spring return cylinder actuator having a pair of piston rods extending from a common spring load piston to the exterior of the housing. In a non-pressure position of the piston, one of the piston rods extends further from the housing than the other. Either piston rod and either end of the housing can be mounted to a device to be actuated so that the same actuator can be used to define a non-pressure extend or retracted actuator without disassembly of the actuator.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: December 12, 1989
    Assignee: General Signal Corporation
    Inventors: William J. Roettger, Douglas Y. Tanner