Patents by Inventor William James Swatos

William James Swatos 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 the preparation of dianhydrides
    Patent number: 6590108
    Abstract: A method for the synthesis of a dianhydride comprises transimidation of bis (imide) (IV) in the presence of a substituted phthalic anhydride or 4-substituted tetrahydrophthalic anhydride to yield dianhydride (V)
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: July 8, 2003
    Assignee: General Electric Company
    Inventors: Roy Ray Odle, Thomas Link Guggenheim, William James Swatos, Michael J. Vollmer
  • Methods for the preparation poly(etherimide)s
    Patent number: 6498224
    Abstract: A new method for the synthesis of poly(etherimide)s comprises transimidation of bis(imide) (IV) in the presence of a substituted phthalic anhydride or 4-substituted tetrahydrophthalic anhydride to yield dianhydride (V) which may then be reacted with a diamine to produce poly(etherimide)s. By-product substituted N-alkylphthalimide or 4-substituted N-alkyltetrahydrophthalic anhydride may be recycled or converted to 4-substituted N-alkylphthalimide for use in the formation bisimide (IV), obviating the need for a nitration step.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: December 24, 2002
    Assignee: General Electric Company
    Inventors: Roy Ray Odle, Thomas Link Guggenheim, William James Swatos, Michael J. Vollmer