Patents by Inventor Steven M. Chranowski

Steven M. Chranowski 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).

  • Static control with TEOS
    Patent number: 5731392
    Abstract: A process for maintaining the electrostatic charges substantially at neutral levels thereby reducing or avoiding sheeting in a fluid bed gas phase olefin polymerization reactor.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: March 24, 1998
    Assignee: Mobil Oil Company
    Inventors: Ahmed H. Ali, Steven M. Chranowski, J. Greg Foster, Thomas A. Geoghegan
  • Supported metallocene catalysts for the production of polyolefins
    Patent number: 5498582
    Abstract: A catalyst precursor is formed by providing in slurry: (1) a carrier, which is porous and in the form of particles, or spheres, preferably particles of a crosslinked polymer, having a particle diameter of about 1 to about 300 microns, a porosity of about 0.001 to about 10 cc/gm, and a surface area of about 1 to about 1,000 m.sup.2 /gm; (2) a metallocene complex having an empirical formulaCp.sub.m MA.sub.n B.sub.pin which Cp is an unsubstituted or substituted cyclopentadienyl group, M is zirconium, titanium, or hafnium; m is 1, 2, or 3 and each of A and B is a halogen atom, hydrogen or an alkyl group, and (3) an anion forming reagent comprising either a borate complex or a borane. An alkyl aluminum compound is used in conjunction with the catalyst as either a cocatalyst or an impurity scavenger.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: March 12, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Michael J. Krause, Frederick Y. Lo, Steven M. Chranowski