Patents by Inventor Diwalker Singh

Diwalker Singh 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).

  • Patent number: 6838532
    Abstract: The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.
    Type: Grant
    Filed: October 10, 2003
    Date of Patent: January 4, 2005
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Thomas Redden Veariel, George Varcelia Yenetchi, Sandy Clay Hinds, Diwalker Singh, Thierry Polchlopek