Patents by Inventor Robert N. Barnard

Robert N. Barnard 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).

  • Portable door locking mechanism
    Patent number: 5401068
    Abstract: A portable door lock comprises a planar lock plate for extending from a door frame and a door edge with a transverse tongue at one end that passes through a frame striker plate into a recess. Apertures in a central portion of the lock plate align with apertures in a block that slides on the lock plate. A locking pin extends through registered apertures in the block and lock plate to lock the block relative to the lock plate when the block is slid against the door.
    Type: Grant
    Filed: May 11, 1994
    Date of Patent: March 28, 1995
    Inventor: Robert N. Barnard