Patents by Inventor Guenther Zwahlen

Guenther Zwahlen 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 the dyeing of colored shaped articles of high polymer, synthetic resins and preparations for such process
    Patent number: 3969302
    Abstract: A process for the manufacture of colored shaped articles from high polymer synthetic resins, wherein water-insoluble, hydrophobic, high polymer synthetic resins in solid form, especially in the form of granules or powders, in a mixture of hydrophilic and organophilic solvents that are reciprocally soluble in one another only to a limited extent and form a two-phase system, are treated with dyestuffs or optical brighteners, the solubility of which in the organophilic portion of the two-phase system is greater than in the hydrophilic portion, the solvent is removed, the synthetic resin dried and shaped, optionally with addition of untreated high polymer fully synthetic resin, from the melt or from a solvent.
    Type: Grant
    Filed: September 26, 1974
    Date of Patent: July 13, 1976
    Assignee: Ciba-Geigy AG
    Inventors: Jacques Wegmann, Carl Becker, Guenther Zwahlen, Werner Kuster
  • Dyestuff preparations and printing inks
    Patent number: 3961965
    Abstract: The invention relates to a dyestuff preparation containing1. at least one dyestuff and/or fluorescent brightening agent which sublimes at 100.degree. to 300.degree.C and2. at least one resin soluble in organic solvents.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: June 8, 1976
    Assignee: Sublistatic Holding SA
    Inventor: Guenther Zwahlen