Patents by Inventor Steven Niewiedzal

Steven Niewiedzal 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).

  • FCC process with enclosed vented riser
    Patent number: 5393414
    Abstract: An FCC process uses a highly efficient separation device to remove product from the catalyst so that the reactor vessel receives a low volume of feed hydrocarbons and riser by-products. The separation device encloses an upwardly directed outlet end of a ballistic separation device in low volume disengaging vessel that collects disengaged catalyst from the riser in a dense bed. Immediate contact of the dense bed with a stripping fluid minimizes the amount of hydrocarbons that are carried out of the disengaging vessel into the open volume of the reactor vessel.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: February 28, 1995
    Assignee: UOP
    Inventors: David A. Lomas, Ismail B. Cetinkaya, Steven Niewiedzal, John C. Sheckler, Paul A. Sechrist