Patents by Inventor Edward J. Witkoski

Edward J. Witkoski 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 locking system
    Patent number: 4637237
    Abstract: A combination lock system on a narrow stile door having selective operation through a drive mechanism including a slide for retraction of the latch bolt operated by the combination lock and a manual control or key operation of the latch bolt. The key operation provides an override of the combination lock operation.
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: January 20, 1987
    Assignee: Simplex Security Systems, Inc.
    Inventors: Edward J. Witkoski, Edgar G. Lizotte