Patents by Inventor Theodore R. Walker, Jr.

Theodore R. Walker, 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).

  • Process for preparing diketones
    Patent number: 5338881
    Abstract: This invention concerns a process for preparing diketones and keto-acids by reacting a dicarboxylic acid and an aromatic compound in the presence of an alkylsulfonic acid such as methanesulfonic acid and a phosphorus pentoxide. The diketones and keto-acids can be used to prepare polyketones which are useful as molding plastics, coatings, films, fibers, and the like.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: August 16, 1994
    Assignee: Eastman Chemical Company
    Inventors: Theodore R. Walker, Jr., Winston J. Jackson, Jr., Jean C. Fleischer
  • Process for preparing alkylsulfonic anhydrides
    Patent number: 5292947
    Abstract: This invention relates to a process for preparing an alkylsulfonic anhydride comprising contacting(A) a dehydrated phosphoric acid with(B) an alkylsulfonic acid having 1 to 6 carbon atoms, under conditions of temperature and pressure to result in the substituted absence of phosphoric/alkylsulfonic mixed anhydride and production of a mixture of alkylsulfonic acid and its corresponding anhydride at a conversion of at least 10% of alkylsulfonic acid to the corresponding alkylsulfonic anhydride.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: March 8, 1994
    Assignee: Eastman Kodak Company
    Inventor: Theodore R. Walker, Jr.
  • Process for preparing diketones and keto-acids
    Patent number: 5107029
    Abstract: This invention concerns a process for preparing diketones and keto-acids by reacting a dicarboxylic acid and an aromatic compound in the presence of an alkylsulfonic acid such as methanesulfonic acid and an organic anhydride compound such as methanesulfonic anhydride or trifluoroacetic anhydride. The diketones and keto-acids can be used to prepare polyketones which are useful as molding plastics, coatings, films, fibers, and the like.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: April 21, 1992
    Assignee: Eastman Kodak Company
    Inventors: Theodore R. Walker, Jr., Winston J. Jackson, Jr., Jean C. Fleischer
  • Polyamide with improved gas barrier properties from cyclo-alkylidene bisphenoxy diacetic acid
    Patent number: 4959446
    Abstract: Polyamide resins useful for forming containers having improved resistance to gas permeability comprising the reaction product of(A) a dicarboxylic acid corresponding to the structure ##STR1## wherein X is hydrogen or unsubstituted alkyl containing 1-5 carbons and n is an integer in the range of 4 to 10, and(B) a diamine containing 5 to 16 carbon atoms.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: September 25, 1990
    Assignee: Eastman Kodak Company
    Inventors: Burns Davis, deceased, Theodore R. Walker, Jr.
  • Production of dialkyl (phenylenedioxy) diacetates
    Patent number: 4922000
    Abstract: Disclosed is a process for preparation of dialkyl (phenylenedioxy)acetates such as dimethyl (1,3-phenylenedioxy)acetate in high yield.The process involves controlling certain reaction conditions such as order of addition of reactants and rate of addition.
    Type: Grant
    Filed: September 21, 1988
    Date of Patent: May 1, 1990
    Assignee: Eastman Kodak Company
    Inventors: Theodore R. Walker, Jr., W. Carl Wooten, Jr.