Patents by Inventor John W. Steiner

John W. Steiner 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).

  • Floor imbedded door bolt
    Patent number: 4343500
    Abstract: A security door stop bolt mounted in the floor preventing entrance through the door including a tube housing imbedded in the floor with a door stop sliding in the tube, nestled in the tube when not in use but raised with a manual lifting means to prevent inadvertent triggering of the stop bolt with a carpet cut out attached to the top of the door stop to hide the entire mechanism.
    Type: Grant
    Filed: May 21, 1980
    Date of Patent: August 10, 1982
    Assignee: Thunderbolt Corporation
    Inventor: John W. Steiner