Patents by Inventor Stephan von Tapavizca

Stephan von Tapavizca 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).

  • Waste disposal of contaminated drill cuttings from geological drilling using drilling fluid systems containing mineral oil
    Patent number: 5755892
    Abstract: Described is the use of ecologically compatible, and more particularly of biologically degradable, oils having flash points of above 80.degree. C. for washing mineral oil-loaded drill cuttings prior to the disposal thereof by off-shore and/or on-shore deposition. For the use as wash oils there are preferred aerobically and/or anaerobically degradable low-viscosity oils are employed which are also suitable for being used as a mixture component of the continuous oil phase of W/O invert drilling fluids.
    Type: Grant
    Filed: January 15, 1997
    Date of Patent: May 26, 1998
    Assignees: Henkel Kommanditgesellschaft auf Aktien, Baroid Limited
    Inventors: Claus-Peter Herold, Heinz Mueller, Stephan von Tapavizca, Malcolm Ellice, Douglas John Grimes