Patents by Inventor Mark J. Ziegler

Mark J. Ziegler 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 of making proppants used in gas or oil extraction
    Patent number: 8464969
    Abstract: A method of making frac sand having a selected grade from a naturally occurring, mined sand having a SiO2 content of at least about 80 percent and having a particle size range where the maximum particle size is less than about 8.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: June 18, 2013
    Assignee: Unimin Corporation
    Inventor: Mark J. Ziegler
  • Method of making proppants used in gas or oil extraction
    Patent number: 8235313
    Abstract: A method of making frac sand having a selected grade from a naturally occurring, mined sand having a SiO2 content of at least about 80 percent and having a particle size range where the maximum particle size is less than about 8.
    Type: Grant
    Filed: September 10, 2009
    Date of Patent: August 7, 2012
    Assignee: Unimin Corporation
    Inventor: Mark J. Ziegler
  • METHOD OF MAKING PROPPANTS USED IN GAS OR OIL EXTRACTION
    Publication number: 20110290917
    Abstract: A method of making frac sand having a selected grade from a naturally occurring, mined sand having a SiO2 content of at least about 80 percent and having a particle size range where the maximum particle size is less than about 8.
    Type: Application
    Filed: August 3, 2011
    Publication date: December 1, 2011
    Applicant: UNIMIN CORPORATION
    Inventor: Mark J. Ziegler
  • METHOD OF MAKING PROPPANTS USED IN GAS OR OIL EXTRACTION
    Publication number: 20100071902
    Abstract: A method of making frac sand having a selected grade from a naturally occurring, mined sand having a SiO2 content of at least about 80 percent and having a particle size range where the maximum particle size is less than about 8.
    Type: Application
    Filed: September 10, 2009
    Publication date: March 25, 2010
    Inventor: Mark J. Ziegler