Patents by Inventor Rene Dufresne

Rene Dufresne 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).

  • Roofing asphalt composition
    Patent number: 9932477
    Abstract: A roofing asphalt composition comprising an oxidized blend of a paving grade asphalt and recycled rubber is described herein.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: April 3, 2018
    Assignee: BITUMAR INC.
    Inventors: Hua Qin Liu, Vu Q. Nguyen, Rene Dufresne
  • Method of the production of a roofing asphalt composition using catalytic oxidation
    Patent number: 9279042
    Abstract: A catalytic process for preparing a roofing asphalt composition comprising an oxidized blend of a paving grade asphalt and recycled rubber is described herein.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: March 8, 2016
    Assignee: Bitumar Inc.
    Inventors: Hua Qin Liu, Vu Q. Nguyen, Rene Dufresne
  • ROOFING ASPHALT COMPOSITION
    Publication number: 20160009920
    Abstract: A roofing asphalt composition comprising an oxidized blend of a paving grade asphalt and recycled rubber is described herein.
    Type: Application
    Filed: July 11, 2014
    Publication date: January 14, 2016
    Inventors: Hua Qin Liu, Vu Q. Nguyen, Rene Dufresne
  • METHOD OF THE PRODUCTION OF A ROOFING ASPHALT COMPOSITION USING CATALYTIC OXIDATION
    Publication number: 20160009894
    Abstract: A catalytic process for preparing a roofing asphalt composition comprising an oxidized blend of a paving grade asphalt and recycled rubber is described herein.
    Type: Application
    Filed: July 11, 2014
    Publication date: January 14, 2016
    Inventors: Hua Qin Liu, Vu Q. Nguyen, Rene Dufresne