Patents by Inventor Joseph Janca

Joseph Janca 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