Patents by Inventor Sandra Botelho Rondinini

Sandra Botelho Rondinini 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).

  • Process for the controlled fixing of scale inhibitor in a subterranean formation
    Patent number: 5840658
    Abstract: A process for fixing of a scale inhibitor in a subterranean formation, which comprises:a) injecting into the formation a solution comprising a polymeric scale inhibitor, a metal cation, a precursor and a weak organic acid, wherein the polymeric scale inhibitor and metal cation are slightly soluble in water in the formation and wherein the precursor reacts in the formation to produce an alkaline compound which causes the polymeric scale inhibitor to precipitate in the formation; andb) allowing the polymeric scale inhibitor to precipitate in the formation in an amount which is effective in inhibiting scale formation for a given period of time.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: November 24, 1998
    Assignee: Petroleo Brasilerio S.A.- Petrobras
    Inventors: Francisca Ferreira Do Rosario, Carlos Nagib Khalil, Maria Carmen Moreira Bezerra, Sandra Botelho Rondinini