Patents by Inventor Friedrich Kunert

Friedrich Kunert 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).

  • Leather dyeing agents and their preparation: membrame separation of dye mother liquor
    Patent number: 4402701
    Abstract: Leather dyeing agents, which can be obtained by concentrating, by means of a membrane separation process, the mother liquors, which are produced in the salting-out process in the preparation of organic dyestuffs which are water-soluble or which contain groups imparting water-solubility, the mother liquors having an extinction in the absorption maximum which is .gtoreq.500, with a layer thickness of 10 cm, and by drying the concentrate, if appropriate.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: September 6, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harald Gleinig, Hans-Heinz Molls, Jochen Koll, Gottfried Dick, Reinhold Hornle, Friedrich Kunert