Patents by Inventor Philip Edward Cowen

Philip Edward Cowen 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).

  • Cellulosic particles and methods of making them
    Patent number: 6451884
    Abstract: Cationic cellulose particles useful in papermaking comprise from greater than 10 up to 50 percent by weight on cellulose of a polymeric amine of weight-average molecular weight in the range from 100,000 to 1,000,000 comprising monomeric units having the formula: —XCR3((CH2)nNR1R2)(CH2)m— where X is selected from the group consisting of a chemical bond, O and NR4; R1 and R2 are the same or different and are selected from the group consisting of H, C1-C4 alkyl, phenyl and phenyl substituted with one, two or three substituents selected from the group consisting of C1-C4 alkyl, C1-C4 alkoxy, F, Cl and Br; R3 and R4 are independently selected from the group consisting of H, methyl and ethyl; m is an integer in the range from 1 to 4; and n is an integer in the range from 0 to 4.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: September 17, 2002
    Assignee: Acordis Kelheim GmbH
    Inventors: Philip Edward Cowen, Richard Kinseher