Patents by Inventor Willy Opitz

Willy Opitz 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).

  • Drilling mud additives based on a polymer mixture, their use, and a process for their production
    Patent number: 5028342
    Abstract: Drilling mud additives based on a polymer mixture of 20 to 80% by weight carboxymethyl cellulose and 80 to 20% by weight of a polycarboxylic acid selected from polyacrylate, polymethacrylate and/or copolymers thereof and/or salts thereof, in which the carboxymethyl cellulose, which has been obtained from raw linters and/or wood cellulose by the slurry process, is mixed in wet, alcohol-moist form with the polycarboxylic acid and dried, to their use in drilling muds or workover and packer liquids, and to a process for their production.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: July 2, 1991
    Assignees: Henkel Kommanditgesellschaft auf Aktien, Phrikolat Chemische Erzeugnisse GmbH
    Inventors: Willy Opitz, Heinz Mueller, Claus-Peter Herold, Stephan Von Tapavicza