Patents by Inventor Hugo Tlach

Hugo Tlach 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).

  • Process for producing sized paper and cardboard with polyelectrolytes and epoxide-amine-polyamide reaction products
    Patent number: 4299654
    Abstract: A process for producing paper or cardboard sized in the pulp with epoxide-amine-polyamide reaction products is disclosed.This process comprises adding to the fibre suspension, which has a pH value of 5 to 8,(A) at least one water-soluble higher molecular polyelectrolyte, which is cationic if the pH value of the fibre suspension is 6.5 to 8 and anionic if the pH value of the fibre suspension is 5 to 7, followed by(B) at least one water-soluble or water-dispersible salt of an epoxide-amine-polyamide reaction product,and further processing the fibre suspension into the form of paper or cardboard.
    Type: Grant
    Filed: December 31, 1979
    Date of Patent: November 10, 1981
    Assignee: Ciba-Geigy Corporation
    Inventors: Hugo Tlach, Klaus-Dieter Leifels, Werner Mischler
  • Process for producing sized paper or cardboard with dyes or optical brighteners and epoxide-amine-polyamide reaction products
    Patent number: 4200489
    Abstract: A process for producing paper or cardboard which is sized in the pulp with epoxide-amine-polyamide reaction products is disclosed.In this process there are added to the fibre suspension(A) at least one water-soluble, anionic, substantive direct dye and/or optical brightener, followed by(B) at least one water-soluble or water-dispersible salt of an epoxide-amine-polyamide reaction product,whereupon the fibre suspension is further processed into paper or into cardboard.
    Type: Grant
    Filed: August 15, 1978
    Date of Patent: April 29, 1980
    Assignee: Ciba-Geigy Corporation
    Inventors: Hugo Tlach, Klaus-Dieter Leifels, Werner Mischler