Patents by Inventor Yuqi Cai

Yuqi Cai 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).

  • Patent number: 8563102
    Abstract: This invention relates to bags and pouches made from films for packaging of flowable materials, in particular liquids that are made from blends of polyethylene and polypropylene useful to in addition to possessing good flex crack resistance, these films can withstand steam sterilization and/or aseptic packaging conditions as they have Hot Tack Initiation Temperatures in the range of from about 100° C. to about 140° C. and Hot Tack Strengths of not more than 5 N/inch in the temperature range from 100° C. to 150° C.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: October 22, 2013
    Assignee: Liqui-Box Corporation
    Inventors: Alan Keith Breck, Nicholas Farkas, Yuqi Cai
  • Patent number: 8211533
    Abstract: This invention relates to blends of polyethylene and polypropylene useful to make films for packaging of flowable materials, in particular liquids. In addition to possessing good flex crack resistance, these films can withstand steam sterilization and/or aseptic packaging conditions as they have Hot Tack Initiation Temperatures in the range of from about 100° C. to about 140° C. and Hot Tack Strengths of not more than 5 N/inch in the temperature range from 100° C. to 150° C.
    Type: Grant
    Filed: September 5, 2007
    Date of Patent: July 3, 2012
    Assignee: Liqui-Box Corporation
    Inventors: Alan Keith Breck, Nicholas Farkas, Yuqi Cai
  • Patent number: 8196373
    Abstract: This invention relates to blends of polyethylene and polypropylene useful to make films for packaging of flowable materials, in particular liquids. In addition to possessing good flex crack resistance, these films can withstand steam sterilization and/or aseptic packaging conditions as they have Hot Tack Initiation Temperatures in the range of from about 100° C. to about 140° C. and Hot Tack Strengths of not more than 5 N/inch in the temperature range from 100° C. to 150° C.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: June 12, 2012
    Assignee: Liqui-Box Corporation
    Inventors: Alan Keith Breck, Nicholas Farkas, Yuqi Cai
  • Publication number: 20110033644
    Abstract: There is disclosed a flowable material packaging film comprising at least a resin blend of (a) from about 33 wt % to about 80 wt % of at least one ethylene-C4 to C10-?-olefin interpolymer having a melt index of from 0.4 to 1.5 g/10 min (190° C., 2.15 kg), a density of from 0.900 to 0.916 g/cc; and (b) from about 67 wt % to about 20 wt % of at least one heterogeneous interpolymer of propylene with ethylene or ethylene and butene comprising from about 71 mol % to about 86 mol % propylene and from about 29 mol % to about 14 mol % ethylene or ethylene and butene, the interpolymer having an overall weight average molecular weight (MW) of at least about 400,000, a xylene soluble phase of not less than 30% (wt), with the xylene soluble phase having a MW of at least about 275,000 and said heterogeneous interpolymer of polypropylene has a density of from 0.875 to 0.91 g/cc; and the film has a Hot Tack Initiation Temperature in the range of from about 100° C. to about 140° C.
    Type: Application
    Filed: August 17, 2010
    Publication date: February 10, 2011
    Applicant: Liqui-Box Corporation
    Inventors: Alan Keith Breck, Nicholas Farkas, Yuqi Cai
  • Publication number: 20110033135
    Abstract: There is disclosed a flowable material packaging film comprising at least a resin blend of (a) from about 33 wt % to about 80 wt % of at least one ethylene-C4 to C10-?-olefin interpolymer having a melt index of from 0.4 to 1.5 g/10 min (190° C., 2.15 kg), a density of from 0.900 to 0.916 g/cc; and (b) from about 67 wt % to about 20 wt % of at least one heterogeneous interpolymer of propylene with ethylene or ethylene and butene comprising from about 71 mol % to about 86 mol % propylene and from about 29 mol % to about 14 mol % ethylene or ethylene and butene, the interpolymer having an overall weight average molecular weight (Mw) of at least about 400,000, a xylene soluble phase of not less than 30% (wt), with the xylene soluble phase having a Mw of at least about 275,000 and said heterogeneous interpolymer of polypropylene has a density of from 0.875 to 0.91 g/cc; and the film has a Hot Tack Initiation Temperature in the range of from about 100° C. to about 140° C.
    Type: Application
    Filed: August 17, 2010
    Publication date: February 10, 2011
    Applicant: Liqui-Box Corporation
    Inventors: Alan Keith Breck, Nicholas Farkas, Yuqi Cai
  • Patent number: 7413685
    Abstract: A method and composition is disclosed for making conductive flow field separator plates having reduced resistivity, lower weight and lower cost. The plates are made by blending from about 0.5 wt % to about 40 wt %, preferably from about 1 wt % to about 30 wt %, most preferably from about 5 wt % to about 20 wt %, of the liquid crystal polymer; from about 0.5 wt % to about 40 wt %, preferably from about 1 wt % to about 30 wt %, most preferably from about 5 wt % to about 20 wt % of the poly(styrene-co-maleic anhydride); and from about 20 wt % to about 99 wt %, preferably from about 60 wt % to about 98 wt %, most preferably from about 70 wt % to about 90 wt % of the conductive filler. The blend is then moulded to form the conductive flow field separator plates.
    Type: Grant
    Filed: May 29, 2007
    Date of Patent: August 19, 2008
    Assignee: E.I. du Pont Canada Company
    Inventors: Yuqi Cai, Divya Chopra, John Fisher
  • Publication number: 20080090062
    Abstract: There is disclosed a flowable material packaging film comprising at least a resin blend of (a) from about 33 wt % to about 80 wt % of at least one ethylene-C4 to C10-?-olefin interpolymer having a melt index of from 0.4 to 1.5 g/10 min (190° C., 2.15 kg), a density of from 0.900 to 0.916 g/cc; and (b) from about 67 wt % to about 20 wt % of at least one heterogeneous interpolymer of propylene with ethylene or ethylene and butene comprising from about 71 mol % to about 86 mol % propylene and from about 29 mol % to about 14 mol % ethylene or ethylene and butene, the interpolymer having an overall weight average molecular weight (MW) of at least about 400,000, a xylene soluble phase of not less than 30% (wt), with the xylene soluble phase having a MW of at least about 275,000 and said heterogeneous interpolymer of polypropylene has a density of from 0.875 to 0.91 g/cc; and the film has a Hot Tack Initiation Temperature in the range of from about 100° C. to about 140° C.
    Type: Application
    Filed: September 5, 2007
    Publication date: April 17, 2008
    Inventors: Alan Breck, Nicholas Farkas, Yuqi Cai
  • Publication number: 20070228338
    Abstract: A method and composition is disclosed for making conductive flow field separator plates having reduced resistivity, lower weight and lower cost. The plates are made by blending from about 0.5 wt % to about 40 wt %, preferably from about 1 wt % to about 30 wt %, most preferably from about 5 wt % to about 20 wt %, of the liquid crystal polymer; from about 0.5 wt % to about 40 wt %, preferably from about 1 wt % to about 30 wt %, most preferably from about 5 wt % to about 20 wt % of the poly(styrene-co-maleic anhydride); and from about 20 wt % to about 99 wt %, preferably from about 60 wt % to about 98 wt %, most preferably from about 70 wt % to about 90 wt % of the conductive filler. The blend is then moulded to form the conductive flow field separator plates.
    Type: Application
    Filed: May 29, 2007
    Publication date: October 4, 2007
    Inventors: Yuqi Cai, Divya Chopra, John Fisher
  • Patent number: 7153603
    Abstract: The present invention provides a process for decreasing the resistivity of a non-machined conductive flow field plate for use in a fuel cell. The process includes the step of annealing the conductive flow field plate by heating the conductive flow field plate to a temperature between 25° C. (room temperature) and a temperature slightly lower than the material softening temperature of the material composition of the conductive flow field plate; maintaining the conductive flow field plate at that temperature for an effective period of time; and, cooling the conductive flow field plate to room temperature.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: December 26, 2006
    Assignee: E. I. duPont Canada Company
    Inventors: Yuqi Cai, Divya Chopra, John C. Fisher
  • Publication number: 20060169952
    Abstract: A method and composition is disclosed for making conductive flow field separator plates having reduced resistivity, lower weight and lower cost. The plates are made by blending from about 0.5 wt % to about 40 wt %, preferably from about 1 wt % to about 30 wt %, most preferably from about 5 wt % to about 20 wt %, of the liquid crystal polymer; from about 0.5 10 wt % to about 40 wt %, preferably from about 1 wt % to about 30 wt %, most preferably from about 5 wt % to about 20 wt % of the poly(styrene-co-maleic anhydride); and from about 20 wt % to about 99 wt %, preferably from about 60 wt % to about 98 wt %, most preferably from about 70 wt % to about 90 wt % of the conductive filler. The blend is then moulded to form the conductive flow field separator plates.
    Type: Application
    Filed: September 11, 2003
    Publication date: August 3, 2006
    Inventors: Yuqi Cai, Divya Chopra, John Fisher
  • Publication number: 20060147781
    Abstract: A conductive composition for fuel cell collector plates and the molding methods thereof are provided. The molding composition includes a polymer resin and conductive fillers, wherein the polymer resin is a polymer blend comprising (1) from about 10 to 100 wt %, preferably from about 50 to about 100 wt % of a grafted polyolefin or a blend of grafted polyolefins and (2) from 0 to about 90 wt %, preferably from about 0 to about 50 wt % of at least one other thermoplastic polymer having a melting point below 280° C. One type of or a combination of different types of highly conductive fillers are selected from carbon, graphite, metallic fillers and mixtures thereof. The polymer resin and conductive fillers are blended into a homogeneous mixture and molded into a collector plate. A preferred method of injection molding and a preferred method of injection-compression molding are provided to mold the composition into the shape of a fuel cell collector plate having a volume resistivity of not more than about 0.1 ohm.
    Type: Application
    Filed: April 4, 2004
    Publication date: July 6, 2006
    Inventors: Yuqi Cai, Sassan Hojabr, John Fisher
  • Publication number: 20050181260
    Abstract: An electrically conductive flow field separator plate is disclosed for use in a proton exchange membrane fuel cell. The plate comprises a frame portion, a central planar portion within the frame and a flow field formed in a surface of the central planar portion. The frame portion is elastomeric so as to form a seal with adjacent fuel cell components thereby eliminating the use of separate sealing elements. The frame and the central planar portion are of unitary construction and comprise from about 10 wt. % to about 50 wt. % of elastomer and from about 50 wt. % to about 90 wt. % of conductive filler.
    Type: Application
    Filed: June 18, 2003
    Publication date: August 18, 2005
    Inventors: Yuqi Cai, Tuyu Xie, Divya Chopra, Michael Waller, Jay Peters
  • Publication number: 20050167882
    Abstract: The present invention provides a process for decreasing the resistivity of a non-machined conductive flow field plate for use in a fuel cell. The process includes the step of annealing the conductive flow field plate by heating the conductive flow field plate to a temperature between 25° C. (room temperature) and a temperature slightly lower than the material softening temperature of the material composition of the conductive flow field plate; maintaining the conductive flow field plate at that temperature for an effective period of time; and, cooling the conductive flow field plate to room temperature.
    Type: Application
    Filed: March 17, 2003
    Publication date: August 4, 2005
    Inventors: Yuqi Cai, Divya Chopra, John Fisher
  • Publication number: 20050042496
    Abstract: An improved process for fabricating an electrically conductive shaped article is disclosed. The process includes one or more process stages selected from the group consisting of: preparing one or more feeds of the plastic and fillers; feeding the plastic and fillers to a melt compounding stage wherein a homogeneous melt of the composition is obtained; transferring the homogeneous melt ; and subjecting the homogeneous melt to a moulding process to produce the conductive shaped article. One or more of the process stages is conducted under low shear strain conditions so that the article has a through-plane resistivity of less than about 600 ?Ohm-m. Also disclosed are the conductive plates having improved performance properties such as flexural strength, conductivity and surface smoothness.
    Type: Application
    Filed: February 13, 2003
    Publication date: February 24, 2005
    Inventors: Mukesh Bisara, Yuqi Cai, Divya Chopra, Alistair Mollison, John Fisher
  • Publication number: 20040191608
    Abstract: Disclosed is a method of making a current collector plate for use in a proton exchange membrane fuel cell. The method includes the steps of: (a) molding the current collector plate by injection, compression or any other molding process from a resin/conductive filler composition; (b) measuring the current collector plate's average thickness; (c) measuring the current collector plate's through-plane resistivity; (d) removing a portion of the current collector plate's surface layer by abrasion; and (e) repeating steps (a) to (d) until a desired plate thickness is removed. The desired plate thickness removed is no more than about 10 micrometers, and preferably about 5 micrometers.
    Type: Application
    Filed: June 23, 2003
    Publication date: September 30, 2004
    Inventors: Divya Chopra, James Guolla, Yuqi Cai, Larin Godfroy, Peter Andrin, John Charles Fisher, Andrew Chi Yan Li
  • Publication number: 20040058249
    Abstract: Separator plates for use in a fuel cell comprising a conductive polymeric composite that is reinforced with an electrically conductive mesh or screen, and a method for making the reinforced separator plates.
    Type: Application
    Filed: December 13, 2002
    Publication date: March 25, 2004
    Inventors: Yuqi Cai, Divya Chopra, Larin Godfroy, John C. Fisher
  • Publication number: 20040046282
    Abstract: The present invention provides a process for decreasing the resistivity of a non-machined conductive flow field plate for use in a fuel cell. The process includes the step of annealing the conductive flow field plate by heating the conductive flow field plate to a temperature between 25° C. (room temperature) and a temperature slightly lower than the material softening temperature of the material composition of the conductive flow field plate; maintaining the conductive flow field plate at that temperature for an effective period of time; and, cooling the conductive flow field plate to room temperature.
    Type: Application
    Filed: March 17, 2003
    Publication date: March 11, 2004
    Inventors: Yuqi Cai, Divya Chopra, John C. Fisher
  • Patent number: 6379795
    Abstract: A method for making a shaped article or a shaped article having a volume resistivity of less than 102 ohm-cm with a desired combination of properties and processibility in an injection moldable composition. In particular the shaped articles formed include injection molded bipolar plates as current collectors in fuel cell applications.
    Type: Grant
    Filed: January 7, 2000
    Date of Patent: April 30, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Mukesh K. Bisaria, Peter Andrin, Mohamed Abdou, Yuqi Cai
  • Patent number: RE40083
    Abstract: A method for making a shaped article or a shaped article having a volume resistivity of less than 102 ohm-cm with a desired combination of properties and processibility in an injection moldable composition. In particular the shaped articles formed include injection molded bipolar plates as current collectors in fuel cell applications.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: February 19, 2008
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Mukesh K. Bisaria, Peter Andrin, Mohamed Abdou, Yuqi Cai