Patents by Inventor Dan C. Yingling

Dan C. Yingling 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).

  • Automatic door operator
    Patent number: 5325628
    Abstract: An automatic door operator which works in conjunction with a sliding door(s) and existing track on which the door(s) moves, to open and close the door(s) without manual pushing and pulling. The invention is useful on single-sliding door installations, biparting single-track installations, and biparting overlapping door installations.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: July 5, 1994
    Inventor: Dan C. Yingling