Patents by Inventor Alfons Knauf

Alfons Knauf 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).

  • Process for the manufacture of lump calcium sulfate
    Patent number: 4173610
    Abstract: Pelletized calcium sulfate is prepared from finely divided, natural or synthetic calcium sulfate, wherein the particle size of the finely divided calcium sulfate is at least about 90 per cent by weight less than 200 .mu.m, there being no particles larger than 500 .mu.m, and wherein the finely divided calcium sulfate has a free water content of from about 0.5 to about 4 per cent by weight, by pressing the finely divided calcium sulfate in the presence of water with a roll press using a surface pressure of 1 to 5 Mp per cm roller length.
    Type: Grant
    Filed: December 20, 1977
    Date of Patent: November 6, 1979
    Assignee: Gebr. Knauf Westdeutsche Gipswerke
    Inventors: Rolf Huller, Alfons Knauf, Franz Wirsching
  • Multi-layer plasterboard
    Patent number: 3993822
    Abstract: A multi-layered gypsum board for construction purposes in which a mixture of gypsum, water and fibers provide the center or core of the board, and a composite coating of a fiberglass layer and a layer of fiberglass fleece covers one of the major surfaces of the core, with the fiberglass layer being embedded into the mixture and plaster favorably adhering to the outer surface of the fiberglass fleece layer. The other major surface of the core may be covered with a similar coating, or a layer, for example, of pasteboard.
    Type: Grant
    Filed: March 16, 1973
    Date of Patent: November 23, 1976
    Assignee: Gebr. Knauf Westdeutsche Gipswerke
    Inventors: Alfons Knauf, Karl Knauf, Franz Wirsching, Gerhard Neuhauser, Herbert Altenhofer