Patents by Inventor Paul C. Lessard

Paul C. Lessard 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).

  • Mechanical activation of granitic powders
    Patent number: 6630022
    Abstract: A mechanically activated pozzolan prepared from granitic quarry fines. Quarry fines are milled by a high-energy milling process to convert the essentially inert raw granitic fines into a chemically reactive state. When added to a portland cement mortar mixture, mechanically activated fines combined with calcium hydroxide to improve the strength of the cured mortar compared to a similar mixture prepared with raw fines. Mortars prepared with mechanically activated granitic fines typically show strength values comparable to or exceeding similar mortars made using fly ash as a pozzolan. In some instances, the strength of a mortar prepared with mechanically activated granitic quarry fines exceeded a mortar prepared using 100% portland cement as the cementitious component.
    Type: Grant
    Filed: May 12, 1999
    Date of Patent: October 7, 2003
    Assignee: Granite Rock Company
    Inventors: Paul C. Lessard, Michael Havens-Cook
  • MECHANICAL ACTIVATION GRANITIC POWDERS
    Publication number: 20030131764
    Abstract: A mechanically activated pozzolan prepared from granitic quarry fines. Quarry fines are milled by a high-energy milling process to convert the essentially inert raw granitic fines into a chemically reactive state. When added to a portland cement mortar mixture, mechanically activated fines combined with calcium hydroxide to improve the strength of the cured mortar compared to a similar mixture prepared with raw fines. Mortars prepared with mechanically activated granitic fines typically show strength values comparable to or exceeding similar mortars made using fly ash as a pozzolan. In some instances, the strength of a mortar prepared with mechanically activated granitic quarry fines exceeded a mortar prepared using 100% portland cement as the cementitious component.
    Type: Application
    Filed: May 12, 1999
    Publication date: July 17, 2003
    Inventors: PAUL C. LESSARD, MICHAEL HAVENS-COOK