Patents by Inventor David J. Christopher

David J. Christopher 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).

  • Copolymers and detergent compositions containing them
    Patent number: 5431846
    Abstract: Novel block copolymers comprising from 20 to 95 mole % of monomer units derived from itaconic acid or a homologue thereof and from 5 to 80 mole % of monomer units derived from vinyl alcohol or a lower vinyl ester are excellent binders of divalent or polyvalent metals and are useful as potentially biodegradable builders in detergent compositions as well as in machine dishwashing compositions and anti-scaling rinse compositions.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: July 11, 1995
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: David J. Christopher, Alfred R. Elmes, Sigrun Eriksen, Ezat Khoshdel, Derek G. Savill