Patents by Inventor Craig D. Marken

Craig D. Marken 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).

  • Modified lignosulfonate drilling fluid dispersants and process for the preparation thereof
    Patent number: 4728727
    Abstract: The present invention relates to modified lignosulfonate materials and the process for their preparation. These modified lignosulfonates result from the sulfonation of ultrafiltered lignosulfonates by reaction with sulfite-bisulfite salts. The removal of sugars and other low molecular weight impurities makes formation of these new modified lignosulfonates more complete. These derivative materials when reacted with metal salts such as chromium, ferrous, ferric, titanium, and zirconium produce oil well drilling fluid dispersant products with significantly improved performance and thermal properties.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: March 1, 1988
    Assignee: ITT Corporation
    Inventors: Marten Reintjes, Craig D. Marken