Patents by Inventor Karl-Heinz Hermann

Karl-Heinz Hermann 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 isolating triarylmethane dyestuffs
    Patent number: 4247470
    Abstract: Process for isolating dyestuffs of the formula ##STR1## wherein R.sub.1 -R.sub.12 denote hydrogen, alkyl, halogenoalkyl, halogen, alkoxy, alkylmercapto, alkylsulphonyl, alkoxysulphonyl, alkylcarbonyl, alkoxycarbonyl, nitro or cyano, X and Y denote ##STR2## and R.sub.13 and R.sub.14 denote hydrogen, alkyl, halogenoalkyl, cyanoalkyl, cycloalkyl, aryl or aralkyl, and whereinX and R.sub.2, Y and R.sub.10, R.sub.1 and R.sub.2, R.sub.5 and R.sub.6 and R.sub.9 and R.sub.10 can form a 5- or 6-membered ring and A.sup.(-) denotes an anion,by dissolving the crude dyestuffs, which have been obtained by known processes, in aqueous acids, adding an organic solvent which is immiscible with water or of limited miscibility with water and then isolating the dyestuffs in a known manner.
    Type: Grant
    Filed: December 8, 1976
    Date of Patent: January 27, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Heinz Hermann, Hans-Lothar Dorsch
  • Composite sheet structures
    Patent number: 3983306
    Abstract: Composite sheet structures of polyethylene and of copolyamides of .epsilon.-caprolactam, 3-aminomethyl-3,5,5-trimethyl-cyclohexylamine and isophthalic acid.
    Type: Grant
    Filed: February 22, 1974
    Date of Patent: September 28, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Werner Nielinger, Rolf Dhein, Ulrich Haberland, Dietrich Michael, Karl-Heinz Hermann