Patents by Inventor Ernst Schenkenberger

Ernst Schenkenberger 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 spray-drying readily water-soluble dyes and fluorescent brighteners
    Patent number: 4594075
    Abstract: A process is described for spray-drying readily water-soluble dyes and fluorescent brighteners from a saturated aqueous solution which contains undissolved dye or fluorescent brightener in a ratio between dissolved and undissolved matter of 1:9 to 9:1.The free-flowing dye or brightener granulates obtained in this process are distinguished by high bulk density, abrasion resistance and dimensional stability.
    Type: Grant
    Filed: January 22, 1985
    Date of Patent: June 10, 1986
    Assignee: Ciba-Geigy Corporation
    Inventor: Ernst Schenkenberger
  • Process for the manufacture of fine-crystalline fluorescent brighteners of the bis-triazinylaminostilbene series in the .beta.-crystal form
    Patent number: 4326982
    Abstract: A process for the manufacture of fine-crystalline fluorescent brighteners of the bis-triazinylaminostilbene series in the .beta.-crystal form by mixing the water-containing fluorescent brightener filter cake with an aqueous dispersant solution at temperatures between 70.degree. and 85.degree. C. and grinding at this temperature, is provided.
    Type: Grant
    Filed: July 13, 1979
    Date of Patent: April 27, 1982
    Assignee: Ciba-Geigy Corporation
    Inventors: Konrad Neumann, Ernst Schenkenberger
  • Process for the production of negligibly dusty preparation
    Patent number: 4295851
    Abstract: Described is a process for the production of negligibly dusty preparations by spray drying an aqueous suspension containing at least one water-soluble dye or optical brightener and optionally further additives, characterized in that a dust-binding surface active agent is added to the aqueous suspension containing at least one adhesive as e.g. sorbitol and/or to the spray-dried product.
    Type: Grant
    Filed: June 17, 1980
    Date of Patent: October 20, 1981
    Assignee: Ciba-Geigy Corporation
    Inventors: Konrad Neumann, Ernst Schenkenberger, Friedrich Resch