Patents by Inventor Derek Andrew Pratt

Derek Andrew Pratt 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).

  • Azaphenothiazines and azaphenoxazines as antioxidants
    Patent number: 11512262
    Abstract: The present disclosure relates generally to antioxidants. More particularly, the present disclosure relates to lubricating compositions comprising an antioxidant.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: November 29, 2022
    Assignee: University of Ottawa
    Inventors: Derek Andrew Pratt, Evan Haidasz
  • AZAPHENOTHIAZINES AND AZAPHENOXAZINES AS ANTIOXIDANTS
    Publication number: 20200010776
    Abstract: The present disclosure relates generally to antioxidants. More particularly, the present disclosure relates to lubricating compositions comprising an antioxidant.
    Type: Application
    Filed: March 15, 2018
    Publication date: January 9, 2020
    Inventors: Derek Andrew PRATT, Evan HAIDASZ
  • Lubricant Composition
    Publication number: 20180265800
    Abstract: A lubricant composition includes a base oil present in an amount of greater than 70 parts by weight per 100 parts by weight of the lubricant composition and an antioxidant. The antioxidant has the structure: wherein each X is independently CH or N, so long as at least one X is N, wherein Y is CRR?, NR?, PR?, S, or O, each R, R? and R? is independently H, alkyl or aryl, and R? is alkyl, aryl, alkoxy or aryloxy. Each A is independently an electron donating group. The electron donating group (1) has an atom having at least one lone pair of electrons that is bonded directly to the aromatic ring, (2) is an aryl or alkyl group, or (3) is a hydrogen atom.
    Type: Application
    Filed: September 2, 2016
    Publication date: September 20, 2018
    Inventors: Philippe Rabbat, Mary Elizabeth Dery, Bridgett Rakestraw, Sai P. Shum, Paul Angelo Odorisio, Derek Andrew Pratt, Evan Antony Haidasz