Patents by Inventor Walter Dammert

Walter Dammert 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).

  • Azo compounds from pigments of a heterocyclic-substituted aniline coupled to a 2,6-dihydroxy-4-methyl-3-cyano or -3-carbamoylpyridine
    Patent number: 3941766
    Abstract: Azo pigments having 2,6-dihydroxy-4-methyl-3-cyanopyridine or 2,6-dihydroxy-4-methyl-3-carbamolpyridine as coupling component and a heterocyclic substituted aniline as diazo component. The pigments have the formula ##SPC1##In whichR is cyano or carbamoyl;A is an unsubstituted or substituted benzene ring; andB is a heterocyclic ring which is fused with the benzene ring and which contains at least one --NH-- and --CO-- or at least one --NH--CO-- group. Compounds of this formula as pigments are eminently suitable for coloring printing inks, surface coatings and resins.
    Type: Grant
    Filed: January 7, 1974
    Date of Patent: March 2, 1976
    Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft
    Inventors: Peter Dimroth, Walter Dammert
  • Process for the production of iron complexes of tetraazaannulenes
    Patent number: 3936445
    Abstract: Process for the production of iron complexes of tetraazaannulenes starting from isoxazole, o-phenylene diamines and iron compounds. The process yields the iron complexes in good yields and a state of high catalytic activity for oxidation processes.
    Type: Grant
    Filed: March 14, 1974
    Date of Patent: February 3, 1976
    Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft
    Inventors: Helmut Pfitzner, Walter Dammert