Patents by Inventor Waqar R. Qureshi

Waqar R. Qureshi 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).

  • Functionalized higher diamondoids
    Patent number: 7795468
    Abstract: This invention is directed to functionalized higher diamondoids having at least one functional group. Preferably these derivatives have the following Formula I: wherein D is a higher diamondoid nucleus and wherein R1, R2, R3, R4, R5 and R6 are independently selected from a group consisting of hydrogen and functional groups, provided that there is at least one functional group on the derivative. The functionalized higher diamondoid compounds may also be of the formula D—L—(D)n wherein D is a higher diamondoid nucleus and L is a linking group and n is 1 or more. The functionalized higher diamondoid compounds additionally may be of the formula R38—D—D—R39 wherein D is a higher diamondoid nucleus and R38 and R39 are substituents.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: September 14, 2010
    Assignee: Chevron U.S.A. Inc.
    Inventors: Shenggao Liu, Robert M. Carlson, Jeremy E. Dahl, Waqar R. Qureshi
  • Processes for concentrating higher diamondoids
    Patent number: 7173160
    Abstract: Hydroprocessing such as hydrocracking is advantageously employed in processes for the recovery and purification of higher diamondoids from petroleum feedstocks. Hydrocracking and other hydroprocesses degrade nondiamondoid contaminants.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: February 6, 2007
    Assignee: Chevron U.S.A. Inc.
    Inventors: Theo Maesen, Robert M. Carlson, Jeremy E. Dahl, Shenggao Liu, Hye Kyung C. Timken, Waqar R. Qureshi
  • Processes for concentrating higher diamondoids
    Publication number: 20040054243
    Abstract: Hydroprocessing such as hydrocracking is advantageously employed in processes for the recovery and purification of higher diamondoids from petroleum feedstocks. Hydrocracking and other hydroprocesses degrade nondiamondoid contaminants.
    Type: Application
    Filed: July 16, 2003
    Publication date: March 18, 2004
    Applicant: CHEVRON USA INC.
    Inventors: Theo Maesen, Robert M. Carlson, Jeremy E. Dahl, Shenggao Liu, Hye Kyung C. Timken, Waqar R. Qureshi
  • Functionalized higher diamondoids
    Publication number: 20030199710
    Abstract: This invention is directed to functionalized higher diamondoids having at least one functional group.
    Type: Application
    Filed: December 6, 2002
    Publication date: October 23, 2003
    Inventors: Shenggao Liu, Robert M. Carlson, Jeremy E. Dahl, Waqar R. Qureshi