Patents by Inventor Thord Gustav G. Hassler

Thord Gustav G. Hassler 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).

  • Method for controlling pitch on a papermaking machine
    Patent number: 5626720
    Abstract: A method for the control of pitch in an aqueous system used in pulp or paper making is disclosed which comprises adding to the system, or to the pulp making or paper making machinery, a water soluble polymer derived from (a) an epihalohydrin, a diepoxide or a precursor of an epihalohydrin or diepoxide, (b) an alkyl amine having a functionality with respect to an epihalohydrin of 2 and (c) an amine which has a functionality with respect to an epihalohydrin greater than 2 and which does not possess any carbonyl groups.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: May 6, 1997
    Assignee: W.R. Grace & Co.-Conn.
    Inventor: Thord Gustav G. Hassler