Patents by Inventor Jeffrey R. Cowart

Jeffrey R. Cowart 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 controlling deposit of sticky material
    Patent number: 6517682
    Abstract: Method of inhibiting the deposit of sticky material on a papermill felt used in processing pulp slurry into sheets, comprising applying to the papermill felt at least one cationic polymer and at least one nonionic surfactant having an HLB of about 11 to 14.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: February 11, 2003
    Assignee: Hercules Incorporated
    Inventors: William A. Hendriks, Jeffrey R. Cowart
  • Process for controlling deposit of sticky material
    Publication number: 20010000064
    Abstract: Method of inhibiting the deposit of sticky material on a papermill felt used in processing pulp slurry into sheets, comprising applying to the papermill felt at least one cationic polymer and at least one nonionic surfactant having an HLB of about 11 to 14.
    Type: Application
    Filed: November 30, 2000
    Publication date: March 29, 2001
    Inventors: William A. Hendrik, Jeffrey R. Cowart
  • Process for controlling deposit of sticky material
    Patent number: 6171445
    Abstract: Method of inhibiting the deposit of sticky material on a papermill felt used in processing pulp slurry into sheets, comprising applying to the papermill felt at least one cationic polymer and at least one nonionic surfactant having an HLB of about 11 to 14.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: January 9, 2001
    Assignee: Hercules Incorporated
    Inventors: William A. Hendriks, Jeffrey R. Cowart
  • Felt conditioner for deinked recycled newsprint papermaking system
    Patent number: 5575893
    Abstract: A method for conditioning the felts in a papermaking process utilizing deinked secondary fiber in the furnish by adding a felt conditioner consisting of from 5-33% of a nonionic surfactant, from 5-33% of a dispersant, or blends thereof, with the remainder water; wherein the nonionic surfactant is selected from the group consisting of ethoxylated nonylphenols having moles of ethoxylation of from 7.5 to 30 and an HLB of about 12 to 17.2 and di-alkyl phenol ethoxylates having moles of ethoxylation of from 15 to 24 and an HLB of about 13 to 15.1; and wherein the dispersant is selected from the group consisting of the sodium salt of naphthalene sulfonate formaldehyde-condensate having an average molecular weight of from about 700 to 3500, the potassium salt of polymerized alkyl naphthalene sulfonic acid having an average molecular weight of approximately 1000, or the sodium or ammonium salt of lignosulfonate. Additionally, from 1 to 5% of an alkylether hydroxypropyl sultaine enhances performance.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: November 19, 1996
    Assignee: BetzDearborn Inc.
    Inventors: Abdul Q. Khan, Kevin D. Curham, Jeffrey R. Cowart