Patents by Inventor Hugo Hendriks

Hugo Hendriks 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).

  • Cement composition containing chemically crosslinked polyvinyl alcohol (PVA)
    Patent number: 5594050
    Abstract: The invention relates to a new, chemically crosslinked PVA. Its application is that of a fluid loss control agent in fluids used in the oil industry, in particular cement slurries, separating fluids, or "spacers", and drilling muds. Its advantages are that it does not delay the setting of the cement, that it has high temperature properties that are relatively insensitive to external conditions.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: January 14, 1997
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Roland Audebert, Joseph Janca, Pierre Maroy, Hugo Hendriks
  • High temperature retarders for oil field cements, cement slurries and corresponding cementing processes
    Patent number: 5503672
    Abstract: The invention relates to the cementing of high temperature wells. The retarder consists of a methylene phosphonic acid derivative and of a boric acid or a borate at least as acid as borax in an aqueous solution, in particular, Na pentaborate, in a preferred ratio of 0.08 to 0.92 parts by weight. A long setting time and a very swift compressive strength development are obtained at the same time.
    Type: Grant
    Filed: March 8, 1994
    Date of Patent: April 2, 1996
    Assignee: Dowell, a division of Schlumberger Technology Corporation
    Inventors: Veronique Barlet-Gouedard, Hugo Hendriks, Pierre Maroy