Patents by Inventor William James Gamble

William James Gamble 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).

  • Recovery of components from polyester resins
    Patent number: 5747547
    Abstract: There is described a process and apparatus for the depolymerization of polyester resins, such as polyethylene terephthalate into component monomers using a countercurrent or crossflow reactor.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: May 5, 1998
    Assignee: Eastman Kodak Company
    Inventors: Andrius Algimantas Naujokas, William James Gamble
  • Purification of ethylene glycol recovered from polyester resins
    Patent number: 5672780
    Abstract: There is described a process for removing dimethyl terephthalate contaminants from ethylene glycol. The process comprises distilling ethylene glycol in the presence of an ester exchange catalyst to cause reaction between ethylene glycol and dimethyl terephthalate to form compounds that are less volatile than either ethylene glycol or dimethyl terephthalate, such as bishydroxyethyl terephthalate.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: September 30, 1997
    Assignee: Eastman Kodak Company
    Inventors: William James Gamble, Andrius Algimantas Naujokas
  • Recovery of components from polyester resins
    Patent number: 5654470
    Abstract: There is described a process for the depolymerization of polyethylene terephthalate into component monomers at ambient pressure. Monomer solids that deposit during cooling, as part of the recovery operation, are removed using a scraped wall heat exchanger.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: August 5, 1997
    Assignee: Eastman Kodak Company
    Inventors: Andrius Algimantas Naujokas, William James Gamble