Patents by Inventor Cheryl L. Senger Elsbernd

Cheryl L. Senger Elsbernd 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).

  • Foamed nitrogen in liquid CO2 for fracturing
    Patent number: 6729409
    Abstract: A method for fracturing subterranean formations surrounding oil and gas wells using a fracturing fluid consisting of a foam constituted by a liquid phase and a gaseous phase. The liquid phase has a foam forming substance dissolved therein. The foam forming substance is preferably a surfactant such as a non-ionic hydrofluoroether surfactant. The liquid phase is preferably CO2 and the gaseous phase N2.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: May 4, 2004
    Inventors: D. V. Satyanarayana Gupta, Ronald G. Pierce, Cheryl L. Senger Elsbernd
  • Stabilized carbon dioxide fluid composition and use thereof
    Patent number: 6235701
    Abstract: A stable fluid comprising compressed fluid carbon dioxide, an inert gas and a fluorochemical stabilizer is disclosed. The fluid composition is useful in cleaning of metals, glass, ceramics, natural and synthetic polymers, and fabrics and in the extraction of desirables substances, such as the extraction of essential oils from plants.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: May 22, 2001
    Assignee: 3M Innovative Properties Company
    Inventor: Cheryl L. Senger Elsbernd