Patents by Inventor Ragavan Vaidyanathan

Ragavan Vaidyanathan 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).

  • Process for producing polyolefins
    Publication number: 20040230031
    Abstract: A process is provided that produces polyolefins.
    Type: Application
    Filed: August 7, 2001
    Publication date: November 18, 2004
    Inventors: John D. Hottovy, Michael C Carter, Robert W. Bohmer, Scott E. Kufeld, David H. Burns, Donald W. Verser, Ragavan Vaidyanathan
  • Direct recycle fractionation method using a swing column
    Patent number: 6559247
    Abstract: A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the fluid components are flashed and wherein a slip stream comprising diluent and minor amounts of monomer is separated from the bulk of the flashed fluid components. The slip stream is subjected to olefin removal to give an essentially olefin-free stream for recycle to a catalyst mud preparation area. The bulk of the flashed fluid components are recycled directly back to the polymerization zone without expensive olefin removal, although treatment to remove other contaminants can optionally be performed. The polymer and entrained fluid is passed to a low pressure flash zone where the fluids are flashed off, compressed and joined with the flash from the high pressure flash tank.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: May 6, 2003
    Assignee: Chevron Phillips Chemical Company, LP
    Inventors: Scott E. Kufeld, David H. Burns, Ragavan Vaidyanathan
  • Direct recycle fractionation method using a swing column
    Publication number: 20030027945
    Abstract: A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the fluid components are flashed and wherein a slip stream comprising diluent and minor amounts of monomer is separated from the bulk of the flashed fluid components. The slip stream is subjected to olefin removal to give an essentially olefin-free stream for recycle to a catalyst mud preparation area. The bulk of the flashed fluid components are recycled directly back to the polymerization zone without expensive olefin removal, although treatment to remove other contaminants can optionally be performed. The polymer and entrained fluid is passed to a low pressure flash zone where the fluids are flashed off, compressed and joined with the flash from the high pressure flash tank.
    Type: Application
    Filed: July 17, 2002
    Publication date: February 6, 2003
    Inventors: Scott E. Kufeld, David H. Burns, Ragavan Vaidyanathan
  • Diluent slip stream to give catalyst wetting agent
    Patent number: 6262191
    Abstract: A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the fluid components are flashed and wherein a slip stream comprising diluent and minor amounts of monomer is separated from the bulk of the flashed fluid components. The slip stream is subjected to olefin removal to give an essentially olefin-free stream for recycle to a catalyst mud preparation area. The bulk of the flashed fluid components are recycled directly back to the polymerization zone without expensive olefin removal, although treatment to remove other contaminants can optionally be performed. The polymer and entrained fluid is passed to a low pressure flash zone where the fluids are flashed off, compressed and joined with the flash from the high pressure flash tank.
    Type: Grant
    Filed: March 9, 1999
    Date of Patent: July 17, 2001
    Assignee: Phillips Petroleum Company
    Inventors: John D. Hottovy, David H. Burns, Scott E. Kufeld, Timothy Roetman, Ragavan Vaidyanathan