Patents by Inventor Willard H. Nyenbrink

Willard H. Nyenbrink 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).

  • Door opener
    Patent number: 4660324
    Abstract: A door opener is secured to a door jamb on the hinge side. A radius arm extends from a vertical-axis shaft, and overlies the door. Force is transferred to the door by a roller mounted at the outer end of the arm on an axis parallel to the shaft.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: April 28, 1987
    Inventor: Willard H. Nyenbrink