Patents by Inventor William A. Steen

William A. Steen 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 for preventing re-emission of mercury from a flue gas desulfurization system
    Patent number: 8425868
    Abstract: An improvement in the method for preventing re-emissions of mercury from a wet flue gas desulfurization (FGD) system by addition of an additive to the FGD scrubber liquor which interacts in the system scrubber with mercury present in the flue gas to curtail the mercury re-emissions; the mercury re-emissions are reduced to substantially zero by use of an additive selected from one or more members of the group consisting of a dithiol, a dithiolane, and a thiol having a single thiol group and either an oxygen or a hydroxyl group.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: April 23, 2013
    Assignee: URS Corporation
    Inventors: William A. Steen, John E. Currie, Gary M. Blythe, Jennifer L. Paradis, David W. DeBerry, Judith Gres DeBerry
  • METHOD FOR PREVENTING RE-EMISSION OF MERCURY FROM A FLUE GAS DESULFURIZATION SYSTEM
    Publication number: 20120321539
    Abstract: An improvement in the method for preventing re-emissions of mercury from a wet flue gas desulfurization (FGD) system by addition of an additive to the FGD scrubber liquor which interacts in the system scrubber with mercury present in the flue gas to curtail the mercury re-emissions; the mercury re-emissions are reduced to substantially zero by use of an additive selected from one or more members of the group consisting of a dithiol, a dithiolane, and a thiol having a single thiol group and either an oxygen or a hydroxyl group.
    Type: Application
    Filed: August 30, 2012
    Publication date: December 20, 2012
    Applicant: URS Corporation
    Inventors: William A. Steen, John E. Currie, Gary M. Blythe, Jennifer L. Paradis, Judith Gres DeBerry
  • Method for preventing re-emission of mercury from a flue gas desulfurization system
    Patent number: 8257672
    Abstract: An improvement in the method for preventing re-emissions of mercury from a wet flue gas desulfurization (FGD) system by addition of an additive to the FGD scrubber liquor which interacts in the system scrubber with mercury present in the flue gas to curtail the mercury re-emissions; the mercury re-emissions are reduced to substantially zero by use of an additive selected from one or more members of the group consisting of a dithiol, a dithiolane, and a thiol having a single thiol group and either an oxygen or a hydroxyl group.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: September 4, 2012
    Assignee: URS Corporation
    Inventors: William A. Steen, John E. Currie, Gary M. Blythe, Jennifer L. Paradis, David W. DeBerry, Judith Gres DeBerry, legal representative
  • METHOD FOR PREVENTING RE-EMISSION OF MERCURY FROM A FLUE GAS DESULFURIZATION SYSTEM
    Publication number: 20110262326
    Abstract: An improvement in the method for preventing re-emissions of mercury from a wet flue gas desulfurization (FGD) system by addition of an additive to the FGD scrubber liquor which interacts in the system scrubber with mercury present in the flue gas to curtail the mercury re-emissions; the mercury re-emissions are reduced to substantially zero by use of an additive selected from one or more members of the group consisting of a dithiol, a dithiolane, and a thiol having a single thiol group and either an oxygen or a hydroxyl group.
    Type: Application
    Filed: October 22, 2010
    Publication date: October 27, 2011
    Applicant: URS Corporation
    Inventors: William A. Steen, John E. Currie, Gary M. Blythe, Jennifer L. Paradis, David W. DeBerry, Judith Gres DeBerry