Patents by Inventor Elliot J. Roberts

Elliot J. Roberts 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).

  • Desilication in alkaline pulp processes
    Patent number: 4331507
    Abstract: In the alkaline digestion of silica-contaminated paper pulp raw material, an addition of aluminum oxide in the form of bauxite ore is made to the liquor, the aluminum oxide being present in the bauxite as a hydrated oxide such as Al.sub.2 O.sub.3.H.sub.2 O or Al.sub.2 O.sub.3.3H.sub.2 O, to insolubilize silica as a sodalite precipitate, and thereby minimize scaling evaporation, avoid undesirable increase in the viscosity of the liquor, as well as assuring recovery of lime by avoiding formation of calcium silicate during causticizing.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: May 25, 1982
    Assignee: Dorr-Oliver Incorporated
    Inventor: Elliot J. Roberts