Patents by Inventor William G. Todd

William G. Todd 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).

  • Ethylene recovery from a polymerization process
    Patent number: 7709585
    Abstract: A method for solution polymerizing ethylene wherein an ethane purge stream is separated, subjected to high efficiency cryogenic distillation, and a side cut from that distillation recycled to the polymerization process while the overhead and bottoms from that distillation are removed from the polymerization process.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: May 4, 2010
    Assignee: Equistar Chemicals, LP
    Inventors: Alberto Buchelli, Ronald J. Morris, William G. Todd, Anthony Lee Zimmermann
  • Plug-flow method and apparatus for operating a curvilinear pressure vessel where transport phenomena occur
    Patent number: 7531024
    Abstract: A method and apparatus for operating a pressure vessel containing a bed of particulate material comprising substantially leveling the bed and employing a plug-flow inducer in the bed.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: May 12, 2009
    Assignee: Equistar Chemicals, LP
    Inventors: Alberto Buchelli, William G. Todd, Jeffrey R. Golden
  • Residence time distribution method and apparatus for operating a curvilinear pressure vessel where transport phenomena take place
    Patent number: 7491259
    Abstract: A method and apparatus for operating a pressure vessel containing a bed of particulate material comprising substantially leveling the bed and employing a fluid flow distributor above the bed.
    Type: Grant
    Filed: May 9, 2006
    Date of Patent: February 17, 2009
    Assignee: Equistar Chemicals, LP
    Inventors: Alberto Buchelli, William G. Todd
  • Plug-flow method and apparatus for operating a curvilinear pressure vessel where transport phenomena occur
    Publication number: 20070266852
    Abstract: A method and apparatus for operating a pressure vessel containing a bed of particulate material comprising substantially leveling the bed and employing a plug-flow inducer in the bed.
    Type: Application
    Filed: May 17, 2006
    Publication date: November 22, 2007
    Inventors: Alberto Buchelli, William G. Todd, Jeffrey R. Golden
  • High-temperature solution process for polyolefin manufacture
    Patent number: 6756455
    Abstract: A high-temperature solution process for making polyolefins is disclosed. Olefins polymerize at greater than about 130° C. in the presence of an activator and an organometallic complex. The complex includes a bridged indenoindolyl ligand. One part of the ligand is a second indenoindolyl group or a polymerization-stable, cyclopentadienyl-like group having an extended pi-electron system. Because the catalysts activate quickly and thoroughly, even with low levels of an alumoxane, the invention provides an efficient way to make high-molecular-weight (Mw>100K) polyolefins.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: June 29, 2004
    Assignee: Equistar Chemicals, LP
    Inventors: Sandor Nagy, Barbara M. Tsuie, William G. Todd, Charles S. Holland
  • High-temperature solution process for polyolefin manufacture
    Publication number: 20030229188
    Abstract: A high-temperature solution process for making polyolefins is disclosed. Olefins polymerize at greater than about 130° C. in the presence of an activator and an organometallic complex. The complex includes a bridged indenoindolyl ligand. One part of the ligand is a second indenoindolyl group or a polymerization-stable, cyclopentadienyl-like group having an extended pi-electron system. Because the catalysts activate quickly and thoroughly, even with low levels of an alumoxane, the invention provides an efficient way to make high-molecular-weight (Mw>100K) polyolefins.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 11, 2003
    Inventors: Sandor Nagy, Barbara M. Tsuie, William G. Todd, Charles S. Holland
  • Process for producing polyethylene
    Patent number: 5444133
    Abstract: Disclosed is a method of making polyethylene wherein ethylene, a catalyst, a cocatalyst and a solvent are added to a reactor. A first mixture is formed of the ethylene and either the catalyst or the cocatalyst and a second mixture is separately formed of the solvent and the other of the catalyst or cocatalyst. These two mixtures are then combined in a reactor to produce the polyethylene.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: August 22, 1995
    Assignee: Occidental Chemical Corporation
    Inventors: William G. Todd, Patrick A. Grimm, Joe C. Daws