Patents by Inventor Helmut Hohenegger

Helmut Hohenegger 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 production of dustfree granules of dyes and optical brighteners
    Patent number: 4227880
    Abstract: Described is a process for the production of solid dustfree preparations of water-soluble dyes and optical brighteners, which process comprises subjecting the pulverulent dyes or optical brighteners, together with a melt or a solution of ethylene carbonate or propylene carbonate, to a dynamic treatment. The preparations obtained have in particular the advantage that the dust-binding effect is retained undiminished over a long period of time, and that they are completely soluble when used in aqueous baths of dyes or optical brighteners.
    Type: Grant
    Filed: April 14, 1978
    Date of Patent: October 14, 1980
    Assignee: Ciba-Geigy Corporation
    Inventors: Helmut Hohenegger, Hanspeter Baumann, Urs Buchel