Patents by Inventor Otto E. Kersten

Otto E. Kersten 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).

  • Industrial hydraulic door operator
    Patent number: 4941320
    Abstract: A door operator having a fluid drive motor and a manual override. The bidirectional hydraulic motor connects to a drive shaft through a power train including a shiftable --quill--type manual clutch mechanism which allows an alternate connection of the drive shaft to a manually-operated wheel. When the cable which shifts the clutch for manual drive is pulled, a switch disables the control for the hydraulic motor. When the motor is not provided with pressured fluid from the pump a hydraulic brake engages the motor.
    Type: Grant
    Filed: June 17, 1988
    Date of Patent: July 17, 1990
    Assignee: ASI Technologies, Inc.
    Inventors: Otto E. Kersten, Jack E. Moll, George C. Balbach