Patents by Inventor Robert J. Duncanson

Robert J. Duncanson 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).

  • Patent number: 5357728
    Abstract: An improved panel jointing system wherein panels (10,11) are provided with profiled edge portions comprising tongue formations (12) and recesses (13) which are of complementary shape to the tongues (12), the tongues (12) of one panel being receivable in the recesses (13) of another panel, wherein the profiled edge portions comprise integrally formed projections (15, 16) projecting from the edge surfaces of the tongues (12) and/or from the walls forming the recesses (13), the tongues (12), recesses (13) and projections (15, 16) being shaped and dimensioned so that when the tongues are received in the recesses, the tongues (12) form a friction fit with the recesses (13), and the opposed facing surfaces of the tongues (12) and the walls of the recesses (13) being spaced apart so as to form a gap (18) of approximately uniform width which extends along the joint between the panels, interrupted by the projections (15, 16), the gap being fillable with adhesive.
    Type: Grant
    Filed: October 24, 1991
    Date of Patent: October 25, 1994
    Inventor: Robert J. Duncanson