Patents by Inventor Theresa D. Hancock

Theresa D. Hancock 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).

  • Ethoxylated alcohol and dialkylphenol surfactants as Kraft pulping additives for reject reduction and yield increase
    Patent number: 5250152
    Abstract: A method for enhancing the penetration of cooking liquor into wood chips to form a Kraft pulp which comprises adding to the cooking liquor specific surfactants such as ethoxylated dialkylphenols and ethoxylated alcohols.
    Type: Grant
    Filed: July 14, 1992
    Date of Patent: October 5, 1993
    Assignee: Betz PaperChem, Inc.
    Inventors: Tien-Feng Ling, Theresa D. Hancock
  • Process for producing kraft pulp for paper using nonionic surface active agents to improve pulp yield
    Patent number: 4952277
    Abstract: A process for making paper and linerboard, employing certain nonionic surface active agents to increase the yield of kraft pulping. The surface active agents having the structural formula ##STR1## where n is an integer from 8 to 12, and x is a positive integer from 1 to about 100, the surface active agent being present in the cooking liquor in an amount effective to increase the yield of pulp.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: August 28, 1990
    Assignee: Bet PaperChem, Inc.
    Inventors: Cheng-I Chen, Theresa D. Hancock