Patents by Inventor Stephen Patrick Harrison

Stephen Patrick Harrison 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 the production of methyl methacrylate
    Patent number: 6670501
    Abstract: A process for the manufacture of methyl methacrylate includes a process for separating the methyl methacrylate from certain impurities, at least one of which has a freezing point of greater than −50° C., by a fractional crystallisation process.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: December 30, 2003
    Assignee: Lucite International UK Limited
    Inventors: Stephen Patrick Harrison, William David Parten, Joseph Youngblood Stuart, John Stuart Martin
  • Treatment of formaldehyde-containing mixtures
    Patent number: 6384268
    Abstract: A process for the removal of formaldehyde species from a liquid carboxylic acid or carboxylic acid ester stream which forms a two-phase mixture with water is disclosed which comprises the step of subjecting the liquid organic mixture to at least one liquid liquid extraction stage wherein water is used as an extractant to produce an organic phase stream which is substantially formaldehyde free and an aqueous phase stream which contains substantially all of the formaldehyde in the output streams from the liquid liquid extraction. The process is particularly useful for reducing the formaldehyde content of a methyl methacrylate product stream.
    Type: Grant
    Filed: January 11, 2000
    Date of Patent: May 7, 2002
    Assignee: Ineos Acrylics UK Limited
    Inventors: William David Parten, Stephen Patrick Harrison, John Stuart Martin