Patents by Inventor Herbert Knopf

Herbert Knopf 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).

  • Age resistant chrome tanning agents
    Patent number: 4298344
    Abstract: A pulverulent spray dried chrome tanning agent having about 1.8 to 2.6 mols of formate/mol Cr.sub.2 O.sub.3, a basicity of at least about 42% and a sulphate content of at least about 1.8 mols SO.sub.3 /mol Cr.sub.2 O.sub.3, maintaining its solubility in water over a prolonged period of time compared with a similar composition having a lower sulphate content, i.e. the latter becomes increasingly water-insoluble with the passage of time.
    Type: Grant
    Filed: February 15, 1980
    Date of Patent: November 3, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Herbert Knopf, Heinrich Spahrkas, Wolfhard Luck