Patents by Inventor Fletcher Walley

Fletcher Walley 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).

  • Pitch reduction on paper machine forming fabrics and press fabrics
    Patent number: 5368694
    Abstract: A method for controlling or inhibiting the deposition of pitch derived from aqueous pulp suspensions having a neutral or cationic soluble charge onto paper machine equipment surfaces which contact the pulp, comprising a) contacting the pulp with an anionic polymer in an amount sufficient to maintain an anionic charge in the pulp and b) contacting the paper machine equipment surfaces with a cationic polymer in an amount sufficient to inhibit the deposition of pitch deposits thereon.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: November 29, 1994
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Evan V. Rohlf, Fletcher Walley, Richard J. Wagner