Patents by Inventor Steven J. Hardwick

Steven J. Hardwick 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).

  • Mitigation of mercury vapor emissions
    Patent number: 11865496
    Abstract: Some aspects of the present disclosure relate to a method comprising obtaining a sorbent polymer composite material, contacting the sorbent polymer composite material with mercury vapor to form a used sorbent polymer composite material; wherein the used sorbent polymer composite material comprises oxidized mercury and wherein the used sorbent polymer composite material emits oxidized mercury vapor; and contacting the used sorbent polymer composite material with a halogen source, so as to result in a treated sorbent polymer composite material. In some embodiments, the treated sorbent polymer composite material emits less than 0.01 ?g oxidized mercury vapor per minute per gram of the treated sorbent polymer composite, compared to a used sorbent polymer composite, when measured at 65° C. in air having a relative humidity of 95%.
    Type: Grant
    Filed: May 12, 2020
    Date of Patent: January 9, 2024
    Assignee: W. L. Gore & Associates, Inc.
    Inventor: Steven J. Hardwick
  • MITIGATION OF MERCURY VAPOR EMISSIONS
    Publication number: 20220314164
    Abstract: Some aspects of the present disclosure relate to a method comprising obtaining a sorbent polymer composite material, contacting the sorbent polymer composite material with mercury vapor to form a used sorbent polymer composite material; wherein the used sorbent polymer composite material comprises oxidized mercury and wherein the used sorbent polymer composite material emits oxidized mercury vapor; and contacting the used sorbent polymer composite material with a halogen source, so as to result in a treated sorbent polymer composite material. In some embodiments, the treated sorbent polymer composite material emits less than 0.01 ?g oxidized mercury vapor per minute per gram of the treated sorbent polymer composite, compared to a used sorbent polymer composite, when measured at 65° C. in air having a relative humidity of 95%.
    Type: Application
    Filed: May 12, 2020
    Publication date: October 6, 2022
    Inventor: Steven J. Hardwick
  • Textile Filter System, Method For Regenerating A Textile Filter and Regeneration Apparatus
    Publication number: 20140246055
    Abstract: A textile filter system of a pulse jet filtration device that includes a particulate textile filter bag to restrain particles in a gas stream and a textile, chemically active filter sleeve to remove substances from the gas stream. For regenerating a chemically active textile filter, the filter is removed from the filtration device and washed in water along with mechanically treating the textile filter.
    Type: Application
    Filed: February 28, 2014
    Publication date: September 4, 2014
    Applicant: W.L. Gore & Associates GmbH
    Inventors: Johannes Ebert, Steven J. Hardwick, Tim W. Sherman, Richard E. Gebert
  • Purification of sulfur hexafluoride
    Patent number: 5298229
    Abstract: Impurities such as oxygen and moisture can be removed from sulfur hexafluoride by contacting the impure gas with the reaction product of sulfur hexafluoride and a lithium-substituted macroreticulate polymer.
    Type: Grant
    Filed: July 8, 1993
    Date of Patent: March 29, 1994
    Assignee: Hercules Incorporated
    Inventor: Steven J. Hardwick
  • Purification of sulfur hexafluoride
    Patent number: 5252259
    Abstract: Impurities such as oxygen and moisture can be removed from sulfur hexafluoride by contacting the impure gas with the reaction product of sulfur hexafluoride and a lithium-substituted macroreticulate polymer.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: October 12, 1993
    Assignee: Hercules Incorporated
    Inventor: Steven J. Hardwick
  • Crash bag propellant compositions for generating high quality nitrogen gas
    Patent number: 4734141
    Abstract: A crash bag propellant composition and method for generating non-toxic nitrogen gas comprising an azide salt and an oxidant component in which metal oxides are substantially replaced with one or more bi-metallic complexes containing copper or iron in combination with chromium, molybdenum or tungsten.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: March 29, 1988
    Assignee: Hercules Incorporated
    Inventors: Richard V. Cartwright, Steven J. Hardwick