Patents by Inventor Per E. A. Hansson

Per E. A. Hansson 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).

  • Water soluble polyamidoaminepolyamine having weight average molecular weight of at least 5.times.10.sup.5
    Patent number: 4689374
    Abstract: A product formed by reacting a polymeric polyamidoamine with a low molecular weight polyamine under reactions conditions to cause transamidation and then further reacting the transamidation product with a compound which is polyfunctional with respect to amino groups present in the transamidation product. The resultant material is useful in paper making processes as a retention and drainage aid.
    Type: Grant
    Filed: March 28, 1986
    Date of Patent: August 25, 1987
    Assignee: W. R. Grace & Co.
    Inventors: Per E. A. Hansson, Felek Jachimowicz
  • Wet strength material
    Patent number: 4566943
    Abstract: A process and product formed therefrom for imparting wet strength to cellulosic sheet materials by incorporating into the materials a polymeric product having the structural characterization of a substantially completely saturated hydrocarbon polymer chain with pendant secondary and/or tertiary alkylene amine groups and alkylene quaternary ammonium groups.
    Type: Grant
    Filed: November 21, 1984
    Date of Patent: January 28, 1986
    Assignee: W. R. Grace & Co.
    Inventors: Per E. A. Hansson, Felek Jachimowicz
  • Process for the preparation of polymeric amine containing products
    Patent number: 4526936
    Abstract: A process of forming polymeric products having a high degree of pendant secondary or tertiary alkylene amino groups by contacting, in a liquid media, a hydrocarbon polymer having olefinic groups therein with a primary or secondary amine, carbon monoxide and hydrogen in the presence of a catalytic amount of a Group VIII metal compound.
    Type: Grant
    Filed: March 18, 1983
    Date of Patent: July 2, 1985
    Assignee: W. R. Grace & Co.
    Inventors: Felek Jachimowicz, Per E. A. Hansson
  • Wet strength material
    Patent number: 4513121
    Abstract: A process and product formed therefrom for imparting wet strength to cellulosic sheet materials by incorporating into the materials a polymeric product having the structural characterization of a substantially completely saturated hydrocarbon polymer chain with pendant secondary and/or tertiary alkylene amine groups and alkylene quaternary ammonium groups.
    Type: Grant
    Filed: March 18, 1983
    Date of Patent: April 23, 1985
    Assignee: W. R. Grace & Co.
    Inventors: Per E. A. Hansson, Felek Jachimowicz