Patents by Inventor Leslie John Lawrence

Leslie John Lawrence 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).

  • Production of calcinable material
    Patent number: 4112035
    Abstract: Pelletizing damp gypsum to render the gypsum easily calcinable by a process in which the damp gypsum is agitated, and when moisture is observed at the surface of the forming pellets a dry powdered compound of calcium is added until the forming pellets are coated with the powdered compound to become free-flowing.
    Type: Grant
    Filed: May 11, 1977
    Date of Patent: September 5, 1978
    Assignee: Tioxide Group Limited
    Inventors: Leslie John Lawrence, Denis Ansbro