Patents by Inventor Peter B. L. Cook

Peter B. L. Cook 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).

  • Manufacturing plaster articles
    Patent number: 5026428
    Abstract: In the production of plaster articles, for example, dental dies and moulds, powdered gypsum (calcium sulphate) is mixed with an aqueous solution of boric acid and/or silicic acid.By incorporating boric acid and/or silicic acid in the mix, the hardness and setting characteristics of the mix are improved. In a typical application the concentration of boric acid in the aqueous solution is from 0.3 to 1.1 grams boric oxide per liter of solution and the preferred concentration of silicic acid in the aqueous solution is within the range of from 75 mls to 300 mls concentrated silicic acid per liter of aqueous solution.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: June 25, 1991
    Inventor: Peter B. L. Cook