Patents by Inventor David A. Katonak

David A. Katonak 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).

  • Diesters of phosphoric acid 2,5-dioxo-4,4-diphenyl-imidazolidin-1-ylmethyl ester
    Patent number: 6255492
    Abstract: An improved process for the preparation of a diester of phosphoric acid 2,5-dioxo-4,4-diphenyl-imidazolidin-1-ylmethyl ester is described where an alkali metal phosphate is treated with a 3-(chloromethyl)- or 3-(bromomethyl)-5,5-diphenyl-2,4-imidazolidinedione to afford the desired product, as well as valuable intermediates used in the process.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: July 3, 2001
    Assignee: Warner-Lambert Company
    Inventors: Edward M. Davis, James E. Ellis, David A. Katonak
  • Process for the synthesis of diesters of phosphoric acid 2,5-dioxo-4,4-diphenyl-imidazolidin-1-ylmethyl ester
    Patent number: 6022975
    Abstract: An improved process for the preparation of a diester of phosphoric acid 2,5-dioxo-4, 4-diphenyl-imidazolidin-1-ylmethyl ester is described where an alkali metal phosphate is treated with a 3-(chloromethyl)- or 3-(bromomethyl)-5,5-diphenyl-2,4-imidazolidinedione to afford the desired product, as well as valuable intermediates used in the process.
    Type: Grant
    Filed: October 15, 1998
    Date of Patent: February 8, 2000
    Assignee: Warner-Lambert Company
    Inventors: Edward M. Davis, James E. Ellis, David A. Katonak