Patents by Inventor Patricia R. Keen

Patricia R. Keen 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).

  • Press felt conditioner for neutral and alkaline papermaking systems
    Patent number: 4895622
    Abstract: This invention relates to an improved press felt conditioning treatment which controls the deposition of polymerically flocculated particulate substances in a press felt. The treatment comprises applying to the felt an effective inhibiting amount of a conditioner comprising a relatively low molecular weight organic, anionic polymer and at least one hydrophilic, nonionic or anionic surfactant. The polymer preferrably has an acrylic acid or methacrylic acid functionality and is preferrably selected from the group consisting of homopolymers of acrylic acid, a methacrylic acid/polyethylene glycol allyl ether copolymer, a homopolymer of methacrylic acid, an acrylic acid/polyethylene glycol allyl ether copolymer, and an acrylic acid/1-allyloxy-2-hydroxypropane sulfonic acid copolymer.
    Type: Grant
    Filed: November 9, 1988
    Date of Patent: January 23, 1990
    Assignee: Betz Laboratories, Inc.
    Inventors: Daniel J. Barnett, Abdul Q. Khan, Patricia R. Keen