Patents by Inventor Robert R. Burch, Jr.

Robert R. Burch, Jr. 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).

  • Catalysts for polyester production
    Patent number: 5382650
    Abstract: Novel catalysts for polyester production by esterification and/or transesterification are MoS.sub.2 or WS.sub.2 which have been intercalated by alkali metals cations, especially lithium cations, and then contacted with an alcohol or a polyol, a preferred polyol being a glycol which is one of the monomeric units in the polyester produced.
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: January 17, 1995
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert V. Kasowski, Robert R. Burch, Jr.
  • Preparation of polybenzoxazoles from halogenated polyamide anions
    Patent number: 5202389
    Abstract: This invention relates to a process for making polymers containing benzoxazole groups by heating, and thereby dehalogenating, novel anions of orthohalogenated aromatic amide groups of a polyamide. The products are useful as fibers and films.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: April 13, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert R. Burch, Jr.
  • Halogenated aromatic polyamide anion
    Patent number: 5093436
    Abstract: This invention relates to a process for making polymers containing benzoxazole groups by heating, and thereby dehalogenating, novel anions of orthohalogenated aromatic amide groups of a polyamide. The products are useful as fibers and films.
    Type: Grant
    Filed: June 28, 1990
    Date of Patent: March 3, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert R. Burch, Jr.
  • Preparation of articles of manufacture from isotropic and anisotropic polyamide anion solutions
    Patent number: 5084497
    Abstract: A process for preparing shaped articles of manufacture such as fibers, films and coatings from aromatic polyamide anions in liquid sulfoxides; anisotropic solutions of aromatic polyamide anions useful for the preparation of shaped articles having anistropic properties; isotropic solutions comprising the potassium salt of the polyamide anion; and methods for regulating solution viscosity by control of the degree to which the aromatic polyamide anions are deprotonated.
    Type: Grant
    Filed: May 30, 1990
    Date of Patent: January 28, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert R. Burch, Jr., Hans-Werner Schmidt