Patents by Inventor Warren Letzsch

Warren Letzsch 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).

  • Operation of catalyst withdrawal wells with packing
    Publication number: 20090269252
    Abstract: An improved fluidized catalyst withdrawal well containing packing or other structured internals is disclosed for improving the flow of particular solids between two apparatus, such as between a catalyst regenerator and riser reactor.
    Type: Application
    Filed: April 23, 2008
    Publication date: October 29, 2009
    Applicant: Stone & Webster Process Technology, Inc.
    Inventors: Ed Yuan, David Banks, Gary Jackson, Eusebius Gbordzoe, Warren Letzsch
  • Riser termination device
    Patent number: 7429363
    Abstract: The present invention provides an improved separator for use in hydrocarbon cracking process.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: September 30, 2008
    Assignee: Stone & Webster Process Technology, Inc.
    Inventors: Ed Yuan, Warren Letzsch, Gary Jackson, Jim Evans, John Hood
  • Process and apparatus for controlling catalyst temperature in a catalyst stripper
    Patent number: 7273543
    Abstract: A process and an apparatus for catalytic cracking a hydrocarbon feed to lighter hydrocarbon employing a catalyst cooler in flow communication with a catalyst stripper is disclosed.
    Type: Grant
    Filed: August 4, 2003
    Date of Patent: September 25, 2007
    Assignee: Stone & Webster Process Technology, Inc.
    Inventor: Warren Letzsch
  • Riser termination device
    Publication number: 20060177357
    Abstract: The present invention provides an improved separator for use in hydrocarbon cracking process.
    Type: Application
    Filed: February 8, 2005
    Publication date: August 10, 2006
    Inventors: Ed Yuan, Warren Letzsch, Gary Jackson, Jim Evans, John Hood
  • Deep catalytic cracking process
    Publication number: 20050163674
    Abstract: The present invention provides a catalytic cracking reactor system and process in which a riser reactor is configured to have two sections of different radii in order to produced improved selectivity to propene and butenes as products.
    Type: Application
    Filed: March 21, 2005
    Publication date: July 28, 2005
    Inventor: Warren Letzsch
  • Process and apparatus for controlling catalyst temperature in a catalyst stripper
    Publication number: 20050029163
    Abstract: A process and an apparatus for catalytic cracking a hydrocarbon feed to lighter hydrocarbon employing a catalyst cooler in flow communication with a catalyst stripper is disclosed.
    Type: Application
    Filed: August 4, 2003
    Publication date: February 10, 2005
    Inventor: Warren Letzsch