Patents by Inventor Thord G. G. Hassler

Thord G. 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 paper-making machine
    Patent number: 5223097
    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: June 20, 1989
    Date of Patent: June 29, 1993
    Assignee: W. R. Grace AB
    Inventor: Thord G. G. Hassler
  • Novel amino resins useful in sizing paper and their use
    Patent number: 4847315
    Abstract: A water-soluble, thermosetting resin comprising units derived from tris(2-aminoethyl)amine, and preferably units derived from dicyandiamide and/or epichlorohydrin, is useful as an accelerator in paper sizing, e.g. using an alkyl ketene dimer.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: July 11, 1989
    Assignee: W. R. Grace AB
    Inventor: Thord G. G. Hassler