Patents by Inventor Yong Ding

Yong Ding 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).

  • Polymide gas separation membranes
    Patent number: 6790263
    Abstract: Soluble polyamic acid salt (PAAS) precursors comprised of tertiary and quaternary amines, ammonium cations, sulfonium cations, or phosphonium cations, are prepared and fabricated into membranes that are subsequently imidized and converted into rigid-rod polyimide articles, such as membranes with desirable gas separation properties. A method of enhancing solubility of PAAS polymers in alcohols is also disclosed.
    Type: Grant
    Filed: September 14, 2000
    Date of Patent: September 14, 2004
    Assignee: Praxair Technology, Inc.
    Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson
  • Methods for the preparation of polyesters, poly(ester amide)s and poly(ester imide)s and uses of the materials obtained therefrom
    Publication number: 20040152863
    Abstract: The present invention relates to methods for the preparation of polyesters, poly(ester amide)s and poly(ester imide)s. The materials obtained by the methods of present invention are useful as fluid separation membranes and as high performance materials.
    Type: Application
    Filed: February 2, 2004
    Publication date: August 5, 2004
    Inventors: Yong Ding, Benjamin Bikson
  • Methods for the preparation of polyesters, poly(ester amide)s and poly(ester imide)s and uses of the materials obtained therefrom
    Patent number: 6740728
    Abstract: The present invention relates to methods for the preparation of polyesters, poly(ester amide)s and poly(ester imide)s. The materials obtained by the methods of present invention are useful as fluid separation membranes and as high performance materials.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: May 25, 2004
    Assignee: Praxair Technology, Inc.
    Inventors: Yong Ding, Benjamin Bikson
  • Gas separation using membranes formed from blends of perfluorinated polymers
    Patent number: 6723152
    Abstract: A preferred gas separation membrane made from a blend of a copolymer of 2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole (BDD) and tetrafluoroethylene (TFE) with a 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxide based polymer is disclosed, the membrane exhibiting an advantageous combination of gas separation and permeation properties for a number of gas separation applications. In particular, the membrane formed from the blend of these polymers exhibits unexpectedly high gas separation factors for separation of volatile organic hydrocarbon vapors (VOC) from air, compared to the component polymers that form the blends. Fabrication of composite membranes formed from perfluoropolymer blends is further disclosed.
    Type: Grant
    Filed: July 1, 2002
    Date of Patent: April 20, 2004
    Assignee: Praxair Technology, Inc.
    Inventors: Benjamin Bikson, Yong Ding, Johann Katz Leroux, Joyce Katz Nelson
  • Polyimide amic acid salts and polyimide membranes formed therefrom
    Patent number: 6716270
    Abstract: The invention relates to preparation and uses of novel polymeric materials, polyimide amic acid salts (PIAAS). The use of these materials for the fabrication of fluid separation membranes is further disclosed.
    Type: Grant
    Filed: January 23, 2003
    Date of Patent: April 6, 2004
    Assignee: Praxair Technology, Inc.
    Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson, James Timothy Macheras
  • Gas separation using membranes formed from blends of perfluorinated polymers
    Publication number: 20040003714
    Abstract: A preferred gas separation membrane made from a blend of a copolymer of 2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole (BDD) and tetrafluoroethylene (TFE) with a 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxide based polymer is disclosed, the membrane exhibiting an advantageous combination of gas separation and permeation properties for a number of gas separation applications. In particular, the membrane formed from the blend of these polymers exhibits unexpectedly high gas separation factors for separation of volatile organic hydrocarbon vapors (VOC) from air, compared to the component polymers that form the blends. Fabrication of composite membranes formed from perfluoropolymer blends is further disclosed.
    Type: Application
    Filed: July 1, 2002
    Publication date: January 8, 2004
    Inventors: Benjamin Bikson, Yong Ding, Johann Katz Leroux, Joyce Katz Nelson
  • Composite gas separation membranes from perfluoropolymers
    Publication number: 20040000231
    Abstract: Improved composite gas separation membranes from perfluoropolymers are disclosed. The membranes are formed by depositing an ultrathin, dense separation layer of a soluble amorphous perfluoropolymer on top of a porous polyethersulfone substrate. The membranes are particularly useful for the separation and recovery of volatile organic hydrocarbon vapors.
    Type: Application
    Filed: July 1, 2002
    Publication date: January 1, 2004
    Inventors: Benjamin Bikson, Yong Ding, Joyce Katz Nelson
  • Methods for the preparation of polyesters, poly (ester amide) s and poly (ester imide) s and uses of the materials obtained therefrom
    Publication number: 20030233933
    Abstract: The present invention relates to methods for the preparation of polyesters, poly(ester amide)s and poly(ester imide)s. The materials obtained by the methods of present invention are useful as fluid separation membranes and as high performance materials.
    Type: Application
    Filed: May 24, 2002
    Publication date: December 25, 2003
    Inventors: Yong Ding, Be Njamin Bikson
  • Novel polyimide amic acid salts and polyimide membranes formed therefrom
    Publication number: 20030164090
    Abstract: The invention relates to preparation and uses of novel polymeric materials, polyimide amic acid salts (PIAAS). The use of these materials for the fabrication of fluid separation membranes is further disclosed.
    Type: Application
    Filed: January 23, 2003
    Publication date: September 4, 2003
    Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson, James Timothy Macheras
  • Production and use of improved polyimide separation membranes
    Patent number: 6497747
    Abstract: A process for preparing polyimide gas separation membranes is disclosed. The process involves preparing polyamic acid salt membrane precursors that are converted into polyimide membranes by mild thermal or chemical treatments. The gas separation processes that utilize these polyimide membranes are further disclosed.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: December 24, 2002
    Assignee: Praxair Technology, Inc.
    Inventors: Yong Ding, Benjamin Bikson, Joyce Katz Nelson