Patents by Inventor Edward Richman

Edward Richman 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).

  • Absorbent composition of matter, process for preparing same and article prepared therefrom
    Patent number: 4454055
    Abstract: A dry, solid, water-swellable absorbent composition of matter is prepared by blending together (a) a water-insoluble absorbent polymer and (b) from 1 to 75%, by weight of the blend, of an extender material selected from uncrosslinked cellulose derivatives, starch, certain clays and minerals, or mixtures thereof. The composition is characterized by having an absorbency exceeding the sum of the absorbencies, calculated proportionately, of the individual components. In one preferred embodiment, the absorbent polymer is a water-swellable ionic complex of a water-soluble anionic polyelectrolyte and a polyvalent metal cation having a valence of at least three.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: June 12, 1984
    Assignee: National Starch and Chemical Corporation
    Inventors: Edward Richman, Mark A. Thorn