Patents by Inventor David Malcolm Stitt

David Malcolm Stitt 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).

  • Concrete formulation
    Patent number: 6875266
    Abstract: An additive for use in the preparation of lightweight concrete, said additive including a blend of from around 40% to 99% of organic polymeric material and from 1% to around 60% of an air entraining agent. The additive is particularly suitable for the preparation of lightweight concrete which uses polystyrene aggregate. It provides for excellent dispersion of the polystyrene aggregate and improved bond between the polystyrene aggregate and surrounding cementitious binder. The resultant lightweight concrete formulation may be pumped and is particularly suitable for sandwich wall construction.
    Type: Grant
    Filed: April 10, 2000
    Date of Patent: April 5, 2005
    Assignee: James Hardie Research Pty Limited
    Inventors: Basil Taha Naji, Ihor Himezak, David Malcolm Stitt
  • Cement formulation
    Patent number: 6030447
    Abstract: This invention relates to a formulation for preparing a dry formulation for preparing an autoclave cured cementitious product comprising:a cementitious material;a siliceous material; anda dehydroxylated clay mineral.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: February 29, 2000
    Assignee: James Hardie Research Pty. Limited
    Inventors: Basil Taha Naji, Steven Alfred Duselis, James Albert Gleeson, Danielle Simone Klimesch, Brian Patrick Sloane, David Malcolm Stitt