Patents by Inventor Eva M. sterberg

Eva M. sterberg 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).

  • Acidizing method using microemulsion
    Patent number: 4650000
    Abstract: Formations surrounding oil wells, gas wells, injection wells and similar bore holes are treated by the injection of a microemulsion containing an acid solution. The main surfactant of the microemulsion is characterized by having at least two hydrocarbon groups attached to a nitrogen atom via a polar groups.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: March 17, 1987
    Assignees: Berol Kemi AB, Tendex Kjemiservice A/S
    Inventors: Eva M. Andreasson, Finn Egeli, Krister A. Holmberg, Borje Nystrom, Kjell G. Stridh, Eva M. sterberg