Patents by Inventor Roger J. Norberg

Roger J. Norberg 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).

  • Square butt door frame and method of assembly
    Patent number: 4843775
    Abstract: A square butt hollow door frame including upper and lower rail members, and a pair of stile members wherein the inner walls of the stile members are provided at each end with a recess defining inwardly laterally extending flanges adapted to be received in corresponding slots defined through each end of the upper and lower rail members, such that when the respective flanges are received in the respective slots, a locking mechanism is positioned, thereby securing the side members and rail members together to form a door frame.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: July 4, 1989
    Assignee: Nichols- Homeshield, Inc.
    Inventors: Laurence P. Armstrong, Scott A. Libby, James L. Peterson, Roger J. Norberg