Patents by Inventor Gerard Le Fevre

Gerard Le Fevre 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 finely divided particulate siliceous material by decomposition of alkali metal silicate with sulfitic species
    Patent number: 5262143
    Abstract: Production of siliceous precipitates, for example sodium aluminosilicates by decomposition of an alkali metal sulfite solution with a solution of a sulfitic species such as sulfur dioxide, sulfurous acid or a salt thereof. Precipitates having excellent properties are obtained and the co-produced aqueous phase is a solution of alkali metal sulfite which has utility in pulp and paper mills. The process is advantageously carried out in proximity to a pulp and paper making operation wherein the siliceous precipitate may be used as a paper making filler and the alkali metal sulfite solution may be used in the pulping process.
    Type: Grant
    Filed: June 10, 1992
    Date of Patent: November 16, 1993
    Assignee: National Silicates Ltd.
    Inventors: Gerard Le Fevre, Fraser McLellan, Graham R. Hagens