Patents by Inventor Roger E. Bergstrom

Roger E. Bergstrom 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).

  • Removable core lockset with anti-pick core removal ring
    Patent number: 4703638
    Abstract: A removable core (15) for a lockset (10) has a core removal ring (35') which is provided with a gap therein which prevents the lock from being picked by turning the core removal ring with an elongate wire having a wedge-shaped end. One of the end edges of the core removal ring (35') defining the gap is positioned in substantial registration with a keyway (18) at an approximate 6 o'clock position. The other end edge of core removal ring (35') normally resides at an approximate 3 o'clock position.
    Type: Grant
    Filed: August 25, 1986
    Date of Patent: November 3, 1987
    Inventor: Roger E. Bergstrom