Patents by Inventor Rudolf Erdmenger

Rudolf Erdmenger 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 the preparation and conditioning of copper phthalocyanine
    Patent number: 4077972
    Abstract: A process and apparatus for conditioning crude copper phthalocyanine pigment prepared in a solvent-free process which comprises kneading at a shear gradient of 300-20,000 sec..sup.-1 for 10 seconds to 15 minutes and with an energy comsumption of 0.4-50 KWH/Kg. of copper phthalocyanine, a mixture of1. 1.0 part crude copper phthalocyanine which has not previously been subjected to extractive boiling;2. 0.1-20 parts of a salt which is soluble in water or in aqueous acids or bases; and3. 0.3-5 parts of an organic or inorganic solvent or mixture thereof which does not have significant amounts of the pigment or the salt.
    Type: Grant
    Filed: April 2, 1976
    Date of Patent: March 7, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz-Ewald Baurecht, Reinhold Hornle, Rudolf Erdmenger, Gerd Muller, Karlheinz Wolf