Patents by Inventor LiJien Lee

LiJien Lee 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).

  • Glycol based drilling fluid
    Patent number: 6291405
    Abstract: This invention relates to an improved glycol based aqueous drilling fluid. The drilling fluid of this invention has demonstrated utility in controlling and/or reducing swelling of clay formations in the drilling of subterranean wells.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: September 18, 2001
    Assignee: M-I LLC
    Inventors: LiJien Lee, Arvind D. Patel, Emanuel Stamatakis