Patents Represented by Attorney M. N. Cheairs
  • Patent number: 5240851
    Abstract: A new lipase and a new protease, which can be produced by a new Pseudomonas strain, and methods of producing such lipase and protease using said strain, protease, or producing enzymatic additives for detergents whose main active component is the lipase of the invention. Further disclosed are detergent washing compositions containing the lipase and/or the protease or the enzymatic additives, and a washing process using said compositions.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: August 31, 1993
    Assignee: Fina Research, S.A.
    Inventors: Line Paridans, Lea Tirtiaux-Nafpliotis
  • Patent number: 5223468
    Abstract: Syndiospecific catalysts and processes for the syndiotactic propagation of a polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is a substituted vinyl compound. The catalysts comprise an unbalanced metallocene cation characterized by a cationic metallocene ligand having sterically dissimilar ring structures joined to a positively charged coordinating transition metal atom, and a stable noncoordinating counter anion for the metallocene cation. The ring structures are substituted cyclopentadienyl rings which are sterically different from one another at sufficiently low kinetic energy states induced by the substituents on the cyclopentadienyl groups to impart a stereorigid relationship relative to said coordinating metal atom to prevent rotation of the rings about their coordination axes at the polymerization temperature.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: June 29, 1993
    Assignee: Fina Technology, Inc.
    Inventor: Abbas Razavi
  • Patent number: 5223467
    Abstract: Syndiospecific catalysts and processes for the syndiotactic propagation of a polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is a subsituted vinyl compound. The catalysts comprise an unbalanced metallocene cation having sterically dissimilar ring structures joined to a positively charged coordinating transition metal atom and a stable noncoordinating counter anion for the metallocene cation. Both ring structures are substituted cyclopentadienyl rings and one is sterically different from the other. Both are in stereorigid relationship to the coordinating transition metal atom to prevent rotation of the rings by direct stearic hindrence between the ring structures. The catalyst is contacted with a C3+ alpha olefin or other ethylenically unsaturated compound in a polymerization reaction zone and maintained in contact with the catalyst in the reaction zone under polymerization conditions to produce a syndiotactic polymer.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: June 29, 1993
    Assignee: Fina Technology, Inc.
    Inventor: Abbas Razavi