Patents by Inventor Guido De Stefano

Guido De Stefano 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).

  • Clay inhibitors for the drilling industry
    Publication number: 20070207932
    Abstract: The present invention relates to a method for inhibiting hydration of clays in drilling operations comprising the use of an aqueous based drilling fluid containing from 0.2 to 5 wt % of 1,2-cyclohexanediamine and/or its salts.
    Type: Application
    Filed: August 6, 2004
    Publication date: September 6, 2007
    Inventors: Luigi Merli, Guido De Stefano, Giuseppe Li Bassi