Patents by Inventor Gina M. Stewart

Gina M. Stewart 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).

  • Carbon dioxide cleaning and separation systems
    Patent number: 6506259
    Abstract: A separation method includes (a) providing a heterogeneous separation system, the heterogeneous cleaning system comprising CO2 in a first phase and an oil in a separate second phase; (b) entraining a material to be separated in the second phase; (c) wholly or partially solubilizing the second phase in the first phase to produce a separation system in which said material to be separated is insoluble; and then (d) separating the material from the system. The separating step is preferably followed by the step of (e) recovering at least a portion of the oil. The system is useful in a variety of applications, including cleaning (particularly metal cleaning), polymerization, extraction, coating, and particle formation and treatment.
    Type: Grant
    Filed: November 20, 2000
    Date of Patent: January 14, 2003
    Assignee: Micell Technologies, Inc.
    Inventors: Timothy J. Romack, James B. McClain, Gina M. Stewart, Ramone D. Givens
  • Deposition methods utilizing carbon dioxide separation systems
    Patent number: 6413574
    Abstract: A separation method includes (a) providing a heterogeneous separation system, the heterogeneous cleaning system comprising CO2 in a first phase and an oil in a separate second phase; (b) entraining a material to be separated in the second phase; (c) wholly or partially solubilizing the second phase in the first phase to produce a separation system in which said material to be separated is insoluble; and then (d) separating the material from the system. The separating step is preferably followed by the step of (e) recovering at least a portion of the oil. The system is useful in a variety of applications, including cleaning (particularly metal cleaning), polymerization, extraction, coating, and particle formation and treatment.
    Type: Grant
    Filed: May 26, 2000
    Date of Patent: July 2, 2002
    Assignee: Micell Technologies, Inc.
    Inventors: Timothy J. Romack, James B. McClain, Gina M. Stewart, Ramone D. Givens
  • CARBON DIOXIDE CLEANING AND SEPARATION SYSTEMS
    Publication number: 20020048629
    Abstract: A separation method includes (a) providing a heterogeneous separation system, the heterogeneous cleaning system comprising CO2 in a first phase and an oil in a separate second phase; (b) entraining a material to be separated in the second phase; (c) wholly or partially solubilizing the second phase in the first phase to produce a separation system in which said material to be separated is insoluble; and then (d) separating the material from the system. The separating step is preferably followed by the step of (e) recovering at least a portion of the oil. The system is useful in a variety of applications, including cleaning (particularly metal cleaning), polymerization, extraction, coating, and particle formation and treatment.
    Type: Application
    Filed: May 26, 2000
    Publication date: April 25, 2002
    Inventors: Timothy J. Romack, James B. McClain, Gina M. Stewart, Ramone D. Givens
  • End functionalized polysiloxane surfactants in carbon dioxide formulations
    Patent number: 6270531
    Abstract: A method for dry-cleaning articles such as fabrics and clothing in carbon dioxide comprises contacting an article to be cleaned with a liquid dry cleaning composition for a time sufficient to clean the fabric. The liquid dry-cleaning composition comprises a mixture of carbon dioxide, water, and an end-functional polysiloxane surfactant. After the contacting step, the article is separated from the liquid dry cleaning composition. The method is preferably carried out at ambient temperature.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: August 7, 2001
    Assignee: Micell Technologies, Inc.
    Inventors: James P. DeYoung, Gina M. Stewart, Bernadette Storey-Laubach
  • End functionalized polysiloxane surfactants in carbon dioxide formulations
    Patent number: 6228826
    Abstract: A method for dry-cleaning articles such as fabrics and clothing in carbon dioxide comprises contacting an article to be cleaned with a liquid dry cleaning composition for a time sufficient to clean the fabric. The liquid dry-cleaning composition comprises a mixture of carbon dioxide, water, and an end-functional polysiloxane surfactant. After the contacting step, the article is separated from the liquid dry cleaning composition. The method is preferably carried out at ambient temperature.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: May 8, 2001
    Assignee: MiCell Technologies, Inc.
    Inventors: James P. DeYoung, Gina M. Stewart, Bernadette Storey-Laubach
  • Carbon dioxide cleaning and separation systems
    Patent number: 6200393
    Abstract: A separation method includes (a) providing a heterogeneous separation system, the heterogeneous cleaning system comprising CO2 in a first phase and an oil in a separate second phase; (b) entraining a material to be separated in the second phase; (c) wholly or partially solubilizing the second phase in the first phase to produce a separation system in which said material to be separated is insoluble; and then (d) separating the material from the system. The separating step is preferably followed by the step of (e) recovering at least a portion of the oil. The system is useful in a variety of applications, including cleaning (particularly metal cleaning), polymerization, extraction, coating, and particle formation and treatment.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: March 13, 2001
    Assignee: MiCell Technologies, Inc.
    Inventors: Timothy J. Romack, James B. McClain, Gina M. Stewart, Ramone D. Givens
  • Carbon dioxide cleaning and separation systems
    Patent number: 6120613
    Abstract: A separation method includes (a) providing a heterogeneous separation system, the heterogeneous cleaning system including CO.sub.2 in a first phase and an oil in a separate second phase; (b) entraining a material to be separated in the second phase; (c) wholly or partially solubilizing the second phase in the first phase to produce a separation system in which said material to be separated is insoluble; and then (d) separating the material from the system. The separating step is preferably followed by the step of (e) recovering at least a portion of the oil. The system is useful in a variety of applications, including cleaning (particularly metal cleaning), polymerization, extraction, coating, and particle formation and treatment.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: September 19, 2000
    Assignee: MiCell Technologies, Inc.
    Inventors: Timothy J. Romack, James B. McClain, Gina M. Stewart, Ramone D. Givens
  • Methods of dry cleaning with compositions which contain carbon dioxide and end functionalized polysiloxane surfactants
    Patent number: 6001133
    Abstract: A method for dry-cleaning articles such as fabrics and clothing in carbon dioxide comprises contacting an article to be cleaned with a liquid dry cleaning composition for a time sufficient to clean the fabric. The liquid dry-cleaning composition comprises a mixture of carbon dioxide, water, and an end-functional polysiloxane surfactant. After the contacting step, the article is separated from the liquid dry cleaning composition. The method is preferably carried out at ambient temperature.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: December 14, 1999
    Assignee: MiCell Technologies, Inc.
    Inventors: James P. DeYoung, Gina M. Stewart, Bernadette Storey-Laubach