Patents by Inventor Liqin Chen

Liqin Chen 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: 11945792
    Abstract: The present invention relates to various crystalline forms of 6-(1-acryloylpiperidin-4-yl)-2-(4-phenoxyphenyl)nicotinamide. The present invention also relates to pharmaceutical compositions comprising the crystalline forms.
    Type: Grant
    Filed: March 3, 2021
    Date of Patent: April 2, 2024
    Assignee: Beijing Innocare Pharma Tech Co., Ltd
    Inventors: Xiangyang Chen, Zuopeng Wang, Liqin Yu
  • Patent number: 8137600
    Abstract: Injection molding systems and methods useful for making microcellular foamed materials are provided as well as microcellular articles. Pressure drop rate and shear rate are important features in some embodiments, and the invention provides systems for controlling these parameters in an injection molding system. Another aspect involves an injection molding system including a nucleator that is upstream of a pressurized mold. Another aspect involves an extrusion system with the reciprocating screw for forming a single phase solution of non-nucleated blowing agent and polymeric material. Another aspect involves very thin walled microcellular material and very thin walled polymeric material. Another aspect provides a method for producing high weight reductions in very thin-walled parts with surfaces that have no noticeable differences from non-foamed parts.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: March 20, 2012
    Assignee: Trexel, Inc.
    Inventors: David E. Pierick, Jere R. Anderson, Sung Woon Cha, Liqin Chen, James F. Stevenson, Dana E. Laing
  • Patent number: 7473799
    Abstract: A process for the preparation of disubstituted adamantine derivatives characterized by the factor that the aromatic receptors can be a series of halide anisole, phenol, toluene, naphthalene, thiophene, or furan and their substituted derivatives. The synthesized disubstituted adamantine derivatives were subsequently converted into a new class of synthetic retinoids of pharmaceutical importance.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: January 6, 2009
    Assignee: Nanjing University of Aeronautics and Astronautics
    Inventors: Liqin Chen, Lei Tian, Xiaoquan Yao
  • Publication number: 20080226892
    Abstract: Polymer molding processes, such as injection-molding processes, include use of a viscosity-reducing supercritical fluid additive resulting in less breakage of reinforcing fibers upon introduction into the mold.
    Type: Application
    Filed: March 20, 2008
    Publication date: September 18, 2008
    Applicant: Trexel, Inc.
    Inventors: Levi A. Kishbaugh, Kevin J. Levesque, Albert H. Guillemette, Liqin Chen, Jingyi Xu, Kelvin T. Okamoto
  • Publication number: 20080108848
    Abstract: A process for the preparation of disubstituted adamantine derivatives characterized by the factor that the aromatic receptors can be a series of halide anisole, phenol, toluene, naphthalene, thiophene, or furan and their substituted derivatives. The synthesized disubstituted adamantine derivatives were subsequently converted into a new class of synthetic retinoids of pharmaceutical importance.
    Type: Application
    Filed: January 29, 2007
    Publication date: May 8, 2008
    Inventors: Liqin Chen, Lei Tian, Xiaoquan Yao
  • Patent number: 7364788
    Abstract: Polymer molding processes, such as injection-molding processes, include use of a viscosity-reducing supercritical fluid additive resulting in less breakage of reinforcing fibers upon introduction into the mold.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: April 29, 2008
    Assignee: Trexel, Inc.
    Inventors: Levi A. Kishbaugh, Kevin J. Levesque, Albert H. Guillemette, Liqin Chen, Jingyi Xu, Kelvin T. Okamoto
  • Patent number: 7361294
    Abstract: Injection molding systems and methods useful for making microcellular foamed materials are provided as well as microcellular articles. Pressure drop rate and shear rate are important features in some embodiments, and the invention provides systems for controlling these parameters in an injection molding system. Another aspect involves an injection molding system including a nucleator that is upstream of a pressurized mold. Another aspect involves an extrusion system with the reciprocating screw for forming a single phase solution of non-nucleated blowing agent and polymeric material. Another aspect involves very thin walled microcellular material and very thin walled polymeric material. Another aspect provides a method for producing high weight reductions in very thin-walled parts with surfaces that have no noticeable differences from non-foamed parts.
    Type: Grant
    Filed: February 2, 2005
    Date of Patent: April 22, 2008
    Assignee: Trexel, Inc.
    Inventors: David E. Pierick, Jere R. Anderson, Sung Woon Cha, Liqin Chen, James F. Stevenson, Dana E. Laing
  • Publication number: 20080090885
    Abstract: A method for synthesis of losartan 5-carboxylic acid (EXP-3174).
    Type: Application
    Filed: January 29, 2007
    Publication date: April 17, 2008
    Inventors: Liqin Chen, Jian Li, Yingzhong Shen
  • Publication number: 20080050576
    Abstract: Injection molding systems and methods useful for making microcellular foamed materials are provided as well as microcellular articles. Pressure drop rate and shear rate are important features in some embodiments, and the invention provides systems for controlling these parameters in an injection molding system. Another aspect involves an injection molding system including a nucleator that is upstream of a pressurized mold. Another aspect involves an extrusion system with the reciprocating screw for forming a single phase solution of non-nucleated blowing agent and polymeric material. Another aspect involves very thin walled microcellular material and very thin walled polymeric material. Another aspect provides a method for producing high weight reductions in very thin-walled parts with surfaces that have no noticeable differences from non-foamed parts.
    Type: Application
    Filed: August 20, 2007
    Publication date: February 28, 2008
    Applicant: Trexel, Inc.
    Inventors: David Pierick, Jere Anderson, Sung Cha, Liqin Chen, James Stevenson, Dana Laing
  • Publication number: 20060035988
    Abstract: Injection molding systems and methods useful for making microcellular foamed materials are provided as well as microcellular articles. Pressure drop rate and shear rate are important features in some embodiments, and the invention provides systems for controlling these parameters in an injection molding system. Another aspect involves an injection molding system including a nucleator that is upstream of a pressurized mold. Another aspect involves an extrusion system with the reciprocating screw for forming a single phase solution of non-nucleated blowing agent and polymeric material. Another aspect involves very thin walled microcellular material and very thin walled polymeric material. Another aspect provides a method for producing high weight reductions in very thin-walled parts with surfaces that have no noticeable differences from non-foamed parts.
    Type: Application
    Filed: February 2, 2005
    Publication date: February 16, 2006
    Applicant: Trexel, Inc.
    Inventors: David Pierick, Jere Anderson, Sung Cha, Liqin Chen, James Stevenson, Dana Laing
  • Publication number: 20050163881
    Abstract: Injection molding systems and methods useful for making microcellular foamed materials are provided as well as microcellular articles. Pressure drop rate and shear rate are important features in some embodiments, and the invention provides systems for controlling these parameters in an injection molding system. Another aspect involves an injection molding system including a nucleator that is upstream of a pressurized mold. Another aspect involves an extrusion system with the reciprocating screw for forming a single phase solution of non-nucleated blowing agent and polymeric material. Another aspect involves very thin walled microcellular material and very thin walled polymeric material. Another aspect provides a method for producing high weight reductions in very thin-walled parts with surfaces that have no noticeable differences from non-foamed parts.
    Type: Application
    Filed: February 2, 2005
    Publication date: July 28, 2005
    Applicant: Trexel, Inc.
    Inventors: David Pierick, Jere Anderson, Sung Cha, Liqin Chen, James Stevenson, Dana Laing
  • Patent number: 6884823
    Abstract: Injection molding systems and methods useful for making microcellular foamed materials are provided as well as microcellular articles. Pressure drop rate and shear rate are important features in some embodiments, and the invention provides systems for controlling these parameters in an injection molding system. Another aspect involves an injection molding system including a nucleator that is upstream of a pressurized mold. Another aspect involves an extrusion system with the reciprocating screw for forming a single phase solution of non-nucleated blowing agent and polymeric material. Another aspect involves very thin walled microcellular material and very thin walled polymeric material. Another aspect provides a method for producing high weight reductions in very thin-walled parts with surfaces that have no noticeable differences from non-foamed parts.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: April 26, 2005
    Assignee: Trexel, Inc.
    Inventors: David E. Pierick, Jere R. Anderson, Sung W. Cha, Liqin Chen, James F. Stevenson, Dana E. Laing
  • Publication number: 20050042434
    Abstract: Polymer molding processes, such as injection-molding processes, include use of a viscosity-reducing supercritical fluid additive resulting in less breakage of reinforcing fibers upon introduction into the mold.
    Type: Application
    Filed: December 23, 2003
    Publication date: February 24, 2005
    Applicant: Trexel, Inc.
    Inventors: Levi Kishbaugh, Kevin Levesque, Albert Guillemette, Liqin Chen, Jingyi Xu, Kelvin Okamoto
  • Publication number: 20040115418
    Abstract: Foams with low water absorption are provided, along with thermoplastic elastomeric foam materials and methods of forming the same. In some embodiments, the TPE foams have a low water absorption. Microcellular foams are included. Processing conditions (e.g., blowing agent type and content, die geometry, exit melt temperature, among others) may be controlled to produce foams having desirable characteristics, such as low water absorption.
    Type: Application
    Filed: August 22, 2003
    Publication date: June 17, 2004
    Applicant: Trexel, Inc.
    Inventors: Jere R. Anderson, Kent G. Blizard, Liqin Chen, Kelvin T. Okamoto
  • Publication number: 20040038018
    Abstract: Foams with low water absorption are provided, along with thermoplastic elastomeric foam materials and methods of forming the same. In some embodiments, the TPE foams have a low water absorption. Microcellular foams are included. Processing conditions (e.g., blowing agent type and content, die geometry, exit melt temperature, among others) may be controlled to produce foams having desirable characteristics, such as low water absorption.
    Type: Application
    Filed: August 22, 2002
    Publication date: February 26, 2004
    Applicant: Trexel, Inc.
    Inventors: Jere R. Anderson, Kent G. Blizard, Liqin Chen, Kelvin T. Okamoto
  • Publication number: 20010018121
    Abstract: The present invention provides microcellular articles, as well as methods and apparatuses for producing polymeric foams, and, in particular microcellular material. The methods involve forming a gas blanket within a polymer processing die that prevents contact between the polymer melt and surfaces of the die during extrusion. In one set of embodiments, the gas blanket is provided by gas diffusing out of surfaces of the nucleated polymer material. In other embodiments, the gas blanket is formed by introducing a gas from an external source into the polymer flow channel within the die. The dies, according to the invention, are specially configured to generate and to support the gas blanket. The extruded foams are free of surface defects that, typically, arise from contact between the polymer melt and the die surfaces.
    Type: Application
    Filed: March 26, 2001
    Publication date: August 30, 2001
    Inventors: Kelvin T. Okamoto, Liqin Chen, Theodore A. Burnham, Richard S. Straff
  • Patent number: 5672451
    Abstract: Disclosed is a migration imaging member which comprises (a) a substrate, (b) a conductive layer comprising indium tin oxide dispersed in a polymeric binder, (c) a siloxane film charge blocking layer comprising a hydrolysis reaction product of a silane of the formula ##STR1## wherein R.sub.1 is an alkylidene group, R.sub.2 and R.sub.3 are each, independent of the other, a hydrogen atom, an alkyl group, a phenyl group, or a poly(ethyleneamino) group, and R.sub.4, R.sub.5, and R.sub.6 are each, independent of the others, alkyl groups, said siloxane having reactive hydroxyl and ammonium groups attached to silicon atoms, and (d) a softenable layer comprising a softenable material and a photosensitive migration marking material. Optionally an antistatic layer comprising indium tin oxide dispersed in a polymeric binder is situated on the surface of the substrate spaced from the softenable layer.
    Type: Grant
    Filed: April 11, 1996
    Date of Patent: September 30, 1997
    Assignee: Xerox Corporation
    Inventors: Man C. Tam, Liqin Chen, Edward G. Zwartz, Daniel Bihon, Marie-Eve Perron
  • Patent number: 5648542
    Abstract: A process for the preparation of triarylamines which comprises the reaction of an aniline and a haloaromatic component in the presence of a ligand copper catalyst, and wherein the ligand is selected from the group consisting of monodentate tertiary amines and bidentate tertiary amines, and which reaction is accomplished at a temperature of from about 120.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: July 15, 1997
    Assignee: Xerox Corporation
    Inventors: H. Bruce Goodbrand, Liqin Chen, Dale S. Renfer
  • Patent number: 5563014
    Abstract: Disclosed is a migration imaging member comprising (a) a substrate, (b) a softenable layer comprising a softenable material and a photosensitive migration marking material, and (c) a transparentizing agent which transparentizes migration marking material in contact therewith contained in at least one layer of the migration imaging member.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: October 8, 1996
    Assignee: Xerox Corporation
    Inventors: Shadi L. Malhotra, Liqin Chen, Marie-Eve Perron
  • Patent number: 5514505
    Abstract: Disclosed is a process which comprises (a) providing a migration imaging member comprising (1) a substrate and (2) a softenable layer comprising a softenable material and a photosensitive migration marking material present in the softenable layer as a monolayer of particles situated at or near the surface of the softenable layer spaced from the substrate; (b) uniformly charging the imaging member; (3) imagewise exposing the charged imaging member to activating radiation at a wavelength to which the migration marking material is sensitive; (d) subsequent to step (c), causing the softenable material to soften and enabling a first portion of the migration marking material to migrate through the softenable material toward the substrate in an imagewise pattern while a second portion of the migration marking material remains substantially unmigrated within the softenable layer; and (e) contacting the second portion of the migration marking material with a transparentizing agent which transparentizes migration marki
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: May 7, 1996
    Assignee: Xerox Corporation
    Inventors: William W. Limburg, Joseph Mammino, George Liebermann, Clifford H. Griffiths, Michael M. Shahin, Shadi L. Malhotra, Liqin Chen, Marie-Eve Perron