Patents Represented by Attorney, Agent or Law Firm Mille, White, Zelano & Branigan, P.C.
  • Well cementing method using HMHPG filtrate reducer
    Patent number: 6257336
    Abstract: For controlling filtration loss during the installation of climber cement in a well, the procedure entails the addition of a specific quantity of at least one derivative of galactomannan, hydrophilically and hydrophobically modified, a hydrophobically modified hydroxy propyl guar (HMHPG).
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: July 10, 2001
    Assignees: Institut Francais du Petrole, Societe Lamberti SpA
    Inventors: Annie Audibert, Jean-François Argillier, Ugo Pfeiffer, Guiseppe Molteni