Patents by Inventor Frank J. Dinan

Frank J. Dinan 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).

  • Method for the purification of dioxydiphthalic anhydride and ester intermediate made therein
    Patent number: 5512686
    Abstract: Crude mixtures of dioxydiphthalic anhydride containing alkali metal salts are purified by treating the crude mixture with an alkanol, such as n-butanol, to form the dioxydiphthalic acid diester; removing the insoluble alkali metal salts by filtration; removing the excess alkanol; and reconverting the dioxydiphthalic acid diester to dioxydiphthalic anhydride.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: April 30, 1996
    Assignee: Occidental Chemical Corporation
    Inventors: Willis T. Schwartz, Frank J. Dinan, Jeffrey S. Stults
  • Highly fluorinated bis-imides
    Patent number: 5233049
    Abstract: This invention relates to novel fluorinated bis-imides of the formula ##STR1## where X is H or F. The compounds are useful as additives to enhance the properties of high performance polymers such as polyimides.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: August 3, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Frank J. Dinan, Willis T. Schwartz, Roger A. Wolfe
  • Bis-imides of dioxydiphthalic acid
    Patent number: 5185451
    Abstract: Bis-imides of dioxydiphthalic or oxydiphthalic anhydride, are characterized by the formula ##STR1## where Z is H, alkyl of 1-12 carbon atoms, or ##STR2## A is H, Cl, F, NO.sub.2, OH, CF.sub.3, alkyl, alkoxy, alkylaryl or aryloxy, wherein the alkyl groups are 1-6 carbon atoms and the aryl groups are 6-14 carbon atoms; alkenyl or alkynyl of 2-6 carbon atoms; or benzoyl; and Y is H, Cl, F, NO.sub.2, OH, or CF.sub.3 ; X is halogen; X' is hydrogen or halogen; or X and X' together represent an oxygen atom, forming a second ether linkage.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: February 9, 1993
    Assignee: Occidental Chemical Corporation
    Inventors: Jeffrey S. Stults, Willis T. Schwartz, Frank J. Dinan
  • Dioxydiphthalic acid esters
    Patent number: 5166404
    Abstract: Oxydiphthalic acid esters of the formula ##STR1## where Z is H or alkyl, and X is halo, X' is H or halo, or X and X' together represent an oxygen atom; are prepared by the esterification reaction of the corresponding halo-oxydiphthalic anhydride or dioxydiphthalic anhydride with an alkanol.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: November 24, 1992
    Assignee: Occidental Chemical Corporation
    Inventors: Jeffrey S. Stults, Willis T. Schwartz, Frank J. Dinan