Patents by Inventor Harry Rohraff, Sr.

Harry Rohraff, Sr. 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).

  • Patent number: 5375374
    Abstract: A combination manual and electric door opener having a bracket mounted to a door frame at a hinged side of the door. An electric motor is connected to the bracket and in turn connects to a threaded rod. A threaded nut is positioned around the threaded rod. Connected to the threaded rod is a cam arm. Upon engagement by the motor, the threaded nut rotates in a translational direction along the threaded rod. The cam arm is pivoted about a pivot point fastened to the top of the doorway and engages a closed door. The door is thus pivotally acted upon until it is in an open position.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: December 27, 1994
    Inventor: Harry Rohraff, Sr.