Patents by Inventor David W. Akerson

David W. Akerson 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).

  • Method for embossing mineral fiber board
    Patent number: 4073230
    Abstract: A method for surface embossing mineral fiber sheets, comprising mineral fibers, perlite and binders, is disclosed. A liquid, preferably water, is sprayed on the surface of the board to be embossed and the wet surface is compressed at an elevated temperature of from 550.degree. to 750.degree. F for about 0.1 to about 2 seconds. The elevated temperature rapidly forms steam which penetrates the sheet surface to be embossed by the simultaneous application of pressure.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: February 14, 1978
    Assignee: Conwed Corporation
    Inventor: David W. Akerson
  • Non-combustible hardboard sheet
    Patent number: 4072558
    Abstract: A process for preparing a non-combustible hardboard sheet is disclosed. The process comprises the formation of relatively low density insulation board type product which is dried, whereafter the board is wetted on both sides and compressed at relatively high temperatures to form a dense non-combustible hardboard product.
    Type: Grant
    Filed: February 16, 1977
    Date of Patent: February 7, 1978
    Assignee: Conwed Corporation
    Inventor: David W. Akerson
  • Ceiling panel or similar article
    Patent number: D253911
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: January 8, 1980
    Assignee: Conwed Corporation
    Inventors: Miner H. Hendrickson, David W. Akerson