Patents by Inventor David Taylor Bowers

David Taylor Bowers 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 clear copolyesters of terephthalic acid, napthalenedicarboxylic acid and ethylene glycol
    Patent number: 5942596
    Abstract: The present invention relates to a process comprising polymerizing repeat units derived from an acid component comprising terephthalic acid and naphthalenedicarboxylic acid and at least one glycol in the presence of less than about 10 ppm sodium carbonate and between about 10 and about 60 ppm phosphorus. Polyesters formed via the process of the present invention display surprisingly good clarity and color.
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: August 24, 1999
    Assignee: Eastman Chemical Company
    Inventors: Maureen Clare Maag, David Taylor Bowers, Robert Lewis Stoots, Jr.
  • Process for making polyesters containing low concentrations of diethylene glycol
    Patent number: 5856424
    Abstract: The present invention relates to a process for producing a high molecular weight polyester having less than about 0.5 weight % diethylene glycol comprising adding at least one carbonate compound to the ester exchange reaction product produced from reaction of a glycol component comprising ethylene glycol and an ester component comprising dimethylterephthalate, dimethylnaphthalenedicarboxylate and mixtures thereof wherein said reaction product is formed without a Ti catalyst.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: January 5, 1999
    Assignee: Eastman Chemical Company
    Inventors: David Taylor Bowers, Ronnie Jay Jones, Michael Duane Cliffton, Joseph Franklin Knight, Donna Rice Quillen