Patents by Inventor Stephen C. Pearson

Stephen C. Pearson 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).

  • Process for rapidly dissolving gels of water-soluble polymers by extrusion, cutting and then slurrying under high shearing forces
    Patent number: 4113688
    Abstract: A process for rapidly forming dilute aqueous solutions of water-soluble polymer from gels of such polymers is provided. In the process polymer gel is extruded, cut, and slurried in water. The slurry of gel particles is subjected to high shear forces immediately after slurry formation to form a slurry of very fine gel particles. The slurry of fine gel particles is mixed with additional water under low shear conditions to form the dilute aqueous solution of polymer. The process reduces degradation of certain important polymer properties.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: September 12, 1978
    Assignee: Hercules Incorporated
    Inventor: Stephen C. Pearson
  • Cationic polymer prepared from dicyandiamide, a polyamide, a dialkylamine, and an epoxide
    Patent number: 4045377
    Abstract: Cationic polymers which are useful as flocculants are prepared by reacting (a) a condensation polymer prepared from dicyandiamide and a polyalkylenepolyamine, (b) a dialkylamine, and (c) a difunctional epoxide.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: August 30, 1977
    Assignee: Hercules Incorporated
    Inventor: Stephen C. Pearson