Patents by Inventor Edward M. Rigby

Edward M. Rigby 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).

  • Continuous processing equipment for making fiberboard
    Patent number: 5632848
    Abstract: A continuous manufacturing line for preparing gypsum fiberboard is provided. The manufacturing line includes equipment for admixing hydratable gypsum, paper, and a quantity of water to form a substantially homogenous slurry, dewatering apparatus for removing a portion of the excess water from the slurry to produce a substantially continuous wet web, pressing equipment for configuring the wet web with a compression means to form a substantially continuous green board, a cutting station for cutting the substantially continuous green board into individual uncured lengths, and a heating station for curing the individual uncured lengths to form gypsum-dihydrate-containing fiberboards.
    Type: Grant
    Filed: February 16, 1995
    Date of Patent: May 27, 1997
    Assignee: Georgia-Pacific Corporation
    Inventors: Turner W. Richards, Hubert C. Francis, George F. Fowler, Dale R. Greve, Edward M. Rigby