Patents by Inventor David J. Hannaht

David J. Hannaht 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).

  • Manufacture of articles from an organic material and a water-hardenable mass
    Patent number: 4297409
    Abstract: A material primarily for replacing asbestos-cement products includes a reinforcing network of continuous, fibrillated organic film and a water-hardened mass such as Portland cement and sand or alternatively gypsum. The organic film may be a polyolefin such as polypropylene or high modulus polyethylene. The reinforcement may be incorporated as a woven or non-woven network.A process for making such a material is also described.The material has, in some respects, superior properties in relation to those of asbestos-cement.
    Type: Grant
    Filed: November 6, 1979
    Date of Patent: October 27, 1981
    Assignee: University of Surrey
    Inventor: David J. Hannaht