Patents by Inventor Kwantai Cho

Kwantai Cho 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).

  • Publication number: 20180272290
    Abstract: Microporous polymer membranes and related methods of fabrication are provided. An asymmetric microporous membrane embodiment includes, but is not limited to, a thermoplastic polymer substrate defining a plurality of micropores, the thermoplastic polymer including one or more of polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), and a combination thereof; and a polymethylpentene (PMP) polymer skin positioned on the thermoplastic polymer substrate, wherein when the thermoplastic polymer substrate includes PMP, the PMP polymer skin has a crystallinity that differs from a crystallinity of the PMP in the polymer substrate.
    Type: Application
    Filed: June 1, 2018
    Publication date: September 27, 2018
    Inventors: Kwantai Cho, J. Clifton DeLozier
  • Patent number: 10010835
    Abstract: Microporous polymer membranes and related methods of fabrication are provided. An asymmetric microporous membrane embodiment includes, but is not limited to, a thermoplastic polymer substrate defining a plurality of micropores, the thermoplastic polymer including one or more of polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), and a combination thereof; and a polymethylpentene (PMP) polymer skin positioned on the thermoplastic polymer substrate, wherein when the thermoplastic polymer substrate includes PMP, the PMP polymer skin has a crystallinity that differs from a crystallinity of the PMP in the polymer substrate.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: July 3, 2018
    Assignee: 3M Innovative Properties Company
    Inventors: Kwantai Cho, J. Clifton DeLozier
  • Publication number: 20170025658
    Abstract: In accordance with at least selected embodiments, novel or improved porous membranes or substrates, separator membranes, separators, composites, electrochemical devices, batteries, methods of making such membranes or substrates, separators, and/or batteries, and/or methods of using such membranes or substrates, separators and/or batteries are disclosed. In accordance with at least certain embodiments, novel or improved microporous membranes, battery separator membranes, separators, energy storage devices, batteries including such separators, methods of making such membranes, separators, and/or batteries, and/or methods of using such membranes, separators and/or batteries are disclosed. In accordance with at least certain selected embodiments, a separator for a battery which has an oxidation protective and binder-free deposition layer which is stable up to 5.2 volts or more, for example, up to 7 volts, in a battery is disclosed.
    Type: Application
    Filed: July 22, 2016
    Publication date: January 26, 2017
    Inventors: Lie Shi, C. Glen Wensley, Zhengming Zhang, Katharine Chemelewski, Junqing Ma, Ronnie E. Smith, Kwantai Cho, Weifeng Fang, Changqing Wang Adams, Ian McCallum, Jun Nada, Shante P. Williams, Jacob S. Mangum
  • Publication number: 20160248066
    Abstract: In accordance with at least selected embodiments, the present disclosure or invention is directed to improved or novel separators, cells, batteries, and/or methods of manufacture and/or use. In accordance with at least certain embodiments, the present disclosure or invention is directed to improved or novel separators such as a separator for a high energy and/or high voltage lithium ion battery which is stable up to a 4.5 volt, or preferably up to a 5.0 volt or higher charging voltage, such as a novel or improved single or multilayer or multiply microporous separator membrane. In accordance with at least selected embodiments, the present application or invention is directed to novel or improved porous membranes or substrates, separator membranes, separators, composites, electrochemical devices, batteries, cells, methods of making such membranes or substrates, separators, cells, and/or batteries, and/or methods of using such membranes or substrates, separators, cells, and/or batteries.
    Type: Application
    Filed: February 25, 2016
    Publication date: August 25, 2016
    Inventors: Lie Shi, C. Glen Wensley, Ronnie E. Smith, Kwantai Cho, Edward Kruger
  • Patent number: 9254463
    Abstract: In at least one embodiment, the invention preferably relates to a hollow fiber membrane mat having hollow fiber membranes arranged parallel to one another and adjacent to one another, the membranes having a wall and a continuous lumen, wherein the hollow fiber membranes are connected to one another by means of a plurality of linear connecting elements which are arranged spaced apart from one another and parallel to one another and the membranes are kept apart from one another by the linear connecting elements and wherein the hollow fiber membranes are composed of a thermoplastic polymer and wherein the walls of the hollow fiber membranes arranged adjacent to one another are fluid-tight in at least one stripe extending parallel to the linear connecting elements, inside of which stripe the hollow fiber membranes are fluid-tight, preferably have a superheated steam shrinkage of at most 5%. Other embodiments of the invention preferably relate to a method for producing and/or using such hollow fiber membrane mats.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: February 9, 2016
    Assignee: Membrana GmbH
    Inventors: Christian Muehlinghaus, Gareth Peter Taylor, James Clifton Delozier, Eric J. Penegar, Kwantai Cho
  • Publication number: 20150375172
    Abstract: In at least one embodiment, the invention preferably relates to a hollow fiber membrane mat having hollow fiber membranes arranged parallel to one another and adjacent to one another, the membranes having a wall and a continuous lumen, wherein the hollow fiber membranes are connected to one another by means of a plurality of linear connecting elements which are arranged spaced apart from one another and parallel to one another and the membranes are kept apart from one another by the linear connecting elements and wherein the hollow fiber membranes are composed of a thermoplastic polymer and wherein the walls of the hollow fiber membranes arranged adjacent to one another are fluid-tight in at least one stripe extending parallel to the linear connecting elements, inside of which stripe the hollow fiber membranes are fluid-tight, preferably have a superheated steam shrinkage of at most 5%. Other embodiments of the invention preferably relate to a method for producing and/or using such hollow fiber membrane mats.
    Type: Application
    Filed: September 9, 2015
    Publication date: December 31, 2015
    Inventors: Christian MUEHLINGHAUS, Gareth Peter Taylor, James Clifton Delozier, Eric J. Penegar, Kwantai Cho
  • Publication number: 20150258500
    Abstract: Microporous polymer membranes and related methods of fabrication are provided. An asymmetric microporous membrane embodiment includes, but is not limited to, a thermoplastic polymer substrate defining a plurality of micropores, the thermoplastic polymer including one or more of polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), and a combination thereof; and a polymethylpentene (PMP) polymer skin positioned on the thermoplastic polymer substrate, wherein when the thermoplastic polymer substrate includes PMP, the PMP polymer skin has a crystallinity that differs from a crystallinity of the PMP in the polymer substrate.
    Type: Application
    Filed: March 12, 2015
    Publication date: September 17, 2015
    Inventors: Kwantai Cho, J. Clifton DeLozier
  • Publication number: 20030192820
    Abstract: The present invention is directed to a contactor for degassing a liquid. The contactor includes a perforated core and a microporous membrane fabric wrapped around the core. The fabric includes a polymethyl pentene hollow fiber as a weft fiber and a warp yarn. A tube sheet secures the ends of the wound fiber and a shell encases the tube sheet and fabric. The shell has at least one opening to permit fluid flow through the shell and an end cap. In a further embodiment the invention is directed to a contactor for degassing a liquid wherein the contactor is adapted to withstand pressures greater than 0.4 MPa and temperatures greater than 50° C.
    Type: Application
    Filed: April 28, 2003
    Publication date: October 16, 2003
    Inventors: Kwantai Cho, Clifton J. Delozier, Linus I. Holstein, R. Allen Pittman, Charles J. Runkle, Amitava Sengupta
  • Patent number: 6616841
    Abstract: The present invention is directed to a contactor for degrassing a liquid. The contractor includes a perforated core and a microporous membrane fabric wrapped around the core. The fabric includes a polymethyl pentene hollow fiber as a weft fiber and a warp yarn. A tube sheet secures the ends of the wound fiber and a shell encases the tube sheet and fabric. The shell has at least one opening to permit fluid flow through the shell and an end cap. In a further embodiment the invention is directed to a contactor for degrassing a liquid wherein the contactor is adapted to withstand pressures greater than 0.4 MPa and temperatures greater than 50° C.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: September 9, 2003
    Assignee: Celgard Inc.
    Inventors: Kwantai Cho, Clifton J. Delozier, Linus I. Holstein, R. Allen Pittman, Charles J. Runkle, Amitava Sengupta
  • Publication number: 20020195385
    Abstract: The present invention is directed to a contactor for degrassing a liquid. The contractor includes a perforated core and a microporous membrane fabric wrapped around the core. The fabric includes a polymethyl pentene hollow fiber as a weft fiber and a warp yarn. A tube sheet secures the ends of the wound fiber and a shell encases the tube sheet and fabric. The shell has at least one opening to permit fluid flow through the shell and an end cap. In a further embodiment the invention is directed to a contactor for degrassing a liquid wherein the contactor is adapted to withstand pressures greater than 0.4 MPa and temperatures greater than 50° C.
    Type: Application
    Filed: June 21, 2001
    Publication date: December 26, 2002
    Inventors: Kwantai Cho, Clifton J. Delozier, Linus I. Holstein, R. Allen Pittman, Charles J. Runkle, Amitava Sengupta
  • Patent number: 6350411
    Abstract: The present invention is to a process for blood oxygenation using a microporous fiber membrane. The use of the hollow fiber allows improvements in plasma break through results. The oxygenator includes a housing and microporous membrane cartridge. The cartridge comprises a microporous hollow fiber membrane having a wall thickness greater than 30 microns and having a bubble point of ≧150 psig.
    Type: Grant
    Filed: March 23, 1998
    Date of Patent: February 26, 2002
    Assignee: Celgard Inc.
    Inventors: Kwantai Cho, Clifton James Delozier, Robert English Johnston
  • Patent number: 5695545
    Abstract: The present invention is directed to a microporous membrane contactor for degassing liquids at temperatures greater than (>) 60.degree. C. and at pressures greater than or equal (.gtoreq.) to 40 psig. The contactor has a microporous hollow fiber membrane adapted to withstand collapse and resist appreciable pore shrinkage or pore closure when subjected to liquid temperatures greater than (>) 60.degree. C. and liquid pressures greater than or equal to (.gtoreq.) 40 psig for a period of greater than or equal to (.gtoreq.) 30 days. A housing encloses the membrane.
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: December 9, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: Kwantai Cho, Xiaoyan Huang