Patents Examined by W. Cheung
  • Propylene impact copolymers
    Patent number: 6492465
    Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.
    Type: Grant
    Filed: March 24, 2000
    Date of Patent: December 10, 2002
    Assignee: ExxonMobil Chemical Patents, Inc.
    Inventors: Terry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Jr., Francis C. Rix, Dawn C. Wiser
  • Optimization of a cooling water system of a polyolefin production unit
    Patent number: 6235852
    Abstract: The invention relates to a process for cooling polymerization reactors in the preparation of polyolefins, the polymerization being carried out in a first reactor and in at least one further reactor, the further reactor or reactors being connected downstream of the first reactor and each being cooled by an internal cooling circuit in which a cooling medium circulates. The invention comprises feeding cooling medium from the cooling circuit (9) of the first reactor (1) into the cooling circuit (10) of at least one further reactor (2) and taking off the same amount of cooling medium from the cooling circuit (10) of this reactor (2), cooling it and recirculating it into the cooling circuit (9) of the first reactor (1).
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: May 22, 2001
    Assignee: Aventis Research & Technologies GmbH & Co KG
    Inventors: Jürgen Hess, Matthias Stumpf