Patents by Inventor Gururaj Sathyanarayana

Gururaj Sathyanarayana 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).

  • Methods for purifying p,p-bisphenol-A
    Patent number: 7371902
    Abstract: Methods for purifying a p,p-bisphenol A generally include distilling a feed stream comprising p,p-BPA in a distillation column at a pressure less than or equal to 20 millibars. The distillation column separates the bisphenol feed stream to produce a light fraction, an intermediate fraction and a heavy fraction. The intermediate fraction comprising the purified bisphenol contains lesser impurities that the p,p-BPA in the feed stream. In one embodiment, the intermediate stream is recovered using a side-draw. The side-draw is located between a first zone and a third zone in the distillation column.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: May 13, 2008
    Assignee: General Electric Company
    Inventors: Ramachandran Kumar, Gomatam Raghavan Ravi, Hyacinth Mary Bastian, Gururaj Sathyanarayana, Sheldon Jay Shafer, Kumar Krishna Ramamurthy, Dwijaraja Mouli Murukutla, Venkata Rama Narayanan Ganapathy Bhotla
  • Methods for purifying p,p-bisphenol-A
    Publication number: 20060069292
    Abstract: Methods for purifying a p,p-bisphenol A generally include distilling a feed stream comprising p,p-BPA in a distillation column at a pressure less than or equal to 20 millibars. The distillation column separates the bisphenol feed stream to produce a light fraction, an intermediate fraction and a heavy fraction. The intermediate fraction comprising the purified bisphenol contains lesser impurities that the p,p-BPA in the feed stream. In one embodiment, the intermediate stream is recovered using a side-draw. The side-draw is located between a first zone and a third zone in the distillation column.
    Type: Application
    Filed: September 29, 2004
    Publication date: March 30, 2006
    Inventors: Ramachandran Kumar, Gomatam Ravi, Hyacinth Bastian, Gururaj Sathyanarayana, Sheldon Shafer, Kumar Ramamurthy, Dwijaraja Murukutla, G.V. Ramanarayanan