Patents by Inventor Karl-Heinz Risken

Karl-Heinz Risken 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 production of insulating coatings on electrical conductors
    Patent number: 3931418
    Abstract: The invention relates to a process for the insulative coating of electrical conductors with thermosetting resins. According to the invention, the resins used are thermosetting ester resins produced from polyhydric alcohols, carboxylic acids with two or more carboxyl groups attached to an aromatic ring and, as optional components, an aliphatic carboxylic acid and amino group-containing compounds. Low molecular weight resins are used containing from 0.85 to 1 mol of polyhydric alcohols per equivalent of co-condensed carboxylic acid. The resins used have a melt viscosity of at most 40,000 m Pa s at 120.degree.C. Coating is preferably carried out using a solvent-free composition, and at a low temperature.
    Type: Grant
    Filed: February 6, 1974
    Date of Patent: January 6, 1976
    Assignee: Dr. Kurt Herberts & Co. Gesellschaft mit beschrankter Haftung Vorm. Otto Louis Herberts
    Inventor: Karl-Heinz Risken