Patents by Inventor Dave P. Palmer

Dave P. Palmer 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).

  • Economical purification of bisphenol A
    Patent number: 6806394
    Abstract: Process and related apparatus are disclosed for economically producing a very high quality bisphenol A product by a multistage crystallization process utilizing a new cross-flow wash design whereby a high purity wash phenol stream is fed to every washing stage, optionally also in combination with a modified stream flow/recycle design which avoids increased by product production and yield losses otherwise expected from processing increased volumes of wash phenol.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: October 19, 2004
    Assignee: Stone & Webster, Inc.
    Inventors: Steven D. Evitt, Dave P. Palmer
  • Economical purification of bisphenol a
    Publication number: 20040044254
    Abstract: Process and related apparatus are disclosed for economically producing a very high quality bisphenol A product by a multistage crystallization process utilizing a new cross-flow wash design whereby a high purity wash phenol stream is fed to every washing stage, optionally also in combination with a modified stream flow/recycle design which avoids increased by product production and yield losses otherwise expected from processing increased volumes of wash phenol.
    Type: Application
    Filed: September 29, 2003
    Publication date: March 4, 2004
    Inventors: Steven D. Evitt, DAve P. Palmer