Patents Examined by Nel M. Shapiro
  • Enzymatic clarification process for improving the injectivity and filtrabhility of xanthan gums
    Patent number: 4416990
    Abstract: Enzymatic treatment, in aqueous dispersion, of a xanthan gum containing bacteria cell residues and microgels, as impurities, by means of Basidiomycete cellulase, the aqueous dispersion having a pH from 3 to 7 and containing at least 0.1 equivalent/liter of at least one salt of alkali or alkaline-earth metal, said treatment being conducted at a temperature from 25.degree. to 65.degree. C., improved the injectivity and filtrability thereof.
    Type: Grant
    Filed: October 6, 1981
    Date of Patent: November 22, 1983
    Assignee: Institut Francais du Petrole
    Inventors: Marguerite Rinaudo, Michel Milas, Norbert Kohler