Patents by Inventor Ray W. Hinkel

Ray W. Hinkel 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).

  • Use of fibrous mat-faced gypsum board in shaft wall assemblies and improved fire resistant board
    Patent number: 5148645
    Abstract: Glass mat-faced gypsum boards having a set core containing gypsum dihydrate and at least a minimum amount of chopped fibers, as well as other optional fire-resistant additives, are provided. The resulting boards obtain superior fire resistance properties over conventional paper-faced boards of like thickness which include a similar amount of chopped glass fibers.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: September 22, 1992
    Assignee: Georgia-Pacific Corporation
    Inventors: Charles W. Lehnert, Brian G. Randall, George F. Fowler, Jr., Ray W. Hinkel
  • Fire door
    Patent number: 4748771
    Abstract: A fire door comprising a core and edge banding, the principal ingredients of the core being expanded perlite, gypsum and cement, the edge banding comprising a strip of natural wood, a strip of a cast mixture of which the principal ingredient is gypsum and an intervening strip of plastic laminate.
    Type: Grant
    Filed: July 30, 1985
    Date of Patent: June 7, 1988
    Assignee: Georgia-Pacific Corporation
    Inventors: Charles W. Lehnert, James R. Van Dyke, Ray W. Hinkel