Patents by Inventor Liqun Ren
Liqun Ren 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).
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Publication number: 20220151377Abstract: A food preparation table includes a housing at least in part defining multiple food pan receiving locations and a cooling air flow path internal of the housing below the food pan receiving locations. A first food pan is positioned within a first one of the food pan receiving locations such that side walls and a bottom wall of the first food pan are within the cooling air flow path, a first one of the side walls of the first food pan includes a plurality of openings therein to permit some cooling air to enter the first food pan and flow in contact with food items therein.Type: ApplicationFiled: November 16, 2021Publication date: May 19, 2022Inventors: Liqun REN, Sasenka KUKOLJ, Ashutosh A. POTDAR, James R. WRIGHT
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Publication number: 20210348830Abstract: A food pan cooling system includes a housing with a food item holding arrangement including a recessed well area defining at least a first food pan receiving location and a second food pan receiving location. The first food pan receiving location includes a first cooled wall structure in the recessed well area to at least in part define the first food pan receiving location, the first cooled wall structure having a first surface facing the first food pan receiving location. A first thermal shim is connected to the first cooled wall structure, the first thermal shim having a first shim surface and a second shim surface, the first shim surface at least partly in contact with the first surface of the first cooled wall structure, and the second shim surface facing the first food pan receiving location.Type: ApplicationFiled: May 6, 2021Publication date: November 11, 2021Inventors: Liqun Ren, James R. Wright, Keith G. Thompson, Rafael A. Castillo-Borelly
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Publication number: 20160348955Abstract: A combination refrigerator-freezer with dividing air-impermeable air-to-air heat exchanger is a system for cooling a refrigerator compartment and a freezer compartment utilizing a single cooling system and without mixing or exchanging air between the refrigerator compartment and the freezer compartment. Cold air is generated by the cooling system and circulated into the freezer compartment and into a freezer airflow compartment where the cold air cools an air-to-air heat exchanger. Warmer air circulating through a refrigerator airflow compartment positioned opposite to the freezer airflow compartment is cooled by the air-to-air heat exchanger and is in turn able to cool the refrigerator compartment. A control unit is utilized to control the temperatures within the refrigerator compartment and the cooling compartment and to ensure that the system is not active while defrosting is in progress. A first defroster and a second defroster are utilized to prevent key components from icing up.Type: ApplicationFiled: November 25, 2015Publication date: December 1, 2016Applicant: H&K InternationalInventors: Liqun Ren, Norman Craig Glaze
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Patent number: 9068065Abstract: The invention at hand provides hydrolytically degradable ionic copolymers. These ionic copolymerizates are composed of one cyclic ketene acetal A, one anionic or cationic methacrylic acid derivative B, selected from 2-methyl-methacrylate, [2-(2-methyl-1-methylene-allyloxy)]ethanesulfonate, [2-(2-methyl-1-methylene-allyloxy)ethyl]phosphonate or a quaternary amine of the N,N-dimethylaminoethylmethacrylic acid (DMAEMA) and, optionally, a neutral methacrylic acid derivative C. The hydrolytically degradable anionic copolymers according to the present invention are produced by polymerizing the components A, B and C in the presence of a radical initiator under inert gas atmosphere and subsequent purification. All copolymers according to the present invention are hydrolytically degradable. Copolymers comprising a maximum of 40 mol-% of ester groups in the backbone are additionally biodegradable, wherein in the case of cationic copolymers a maximum of 20 mol-% of quaternized DMAEMA is allowed to be available.Type: GrantFiled: April 9, 2009Date of Patent: June 30, 2015Assignee: BASF SEInventors: Andreas Greiner, Seema Agarwal, Thomas Kissel, Liqun Ren
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Patent number: 8604101Abstract: The present invention relates to a process for producing aqueous dispersions of thermoplastic polymers which have a plurality of ester groups and/or carbonate groups in the main polymer chain and which have an acid number of less than 5 mg KOH/g, in particular at most 3 mg KOH/g, and which have a zero-shear viscosity ?0 (180° C.) of at least 60 Pa·s at 180° C. The invention also relates to the polymer dispersions obtainable by said process, and to the use thereof.Type: GrantFiled: March 24, 2011Date of Patent: December 10, 2013Assignee: BASF SEInventors: Liqun Ren, Gimmy Alex Fernandez Ramirez, Motonori Yamamoto, Hermann Seyffer, Gabriel Skupin
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Patent number: 8481639Abstract: A water-soluble or water-dispersible copolymer comprises copolymerized units a) of at least one ethylenically unsaturated monomer with a saccharide side group and b) of at least one hydrophilic ethylenically unsaturated monomer different from (meth)acrylamide, where the weight fraction of the ethylenically unsaturated monomers with a saccharide side group is 5 to 95% by weight. The copolymers exhibit high affinity to inorganic surfaces or hydrophilic fibers, such as cotton. They serve as soil release and/or graying-inhibiting polymers in textile detergents or minimize the risk of microbial colonization of materials coated therewith.Type: GrantFiled: June 16, 2011Date of Patent: July 9, 2013Assignee: BASF SEInventors: Harald Keller, Liqun Ren, Roland Ettl, Claudia Esper
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Publication number: 20130101865Abstract: The present invention relates to the use of an aqueous dispersion of at least one biodegradable polyester in the form of a coating for improving the barrier properties of packaging materials made of paper or paperboard, in particular of packaging materials made of recycled paper or paperboard, with respect to mineral oils. The present invention also relates to a process for producing barrier coatings on paper or paperboard, in particular on recycled paper or paperboard.Type: ApplicationFiled: September 20, 2012Publication date: April 25, 2013Applicant: BASF SEInventors: Liqun Ren, Gimmy Alex Fernandez Ramirez, Hermann Seyffer, Gabriel Skupin
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Publication number: 20110313097Abstract: A water-soluble or water-dispersible copolymer comprises copolymerized units a) of at least one ethylenically unsaturated monomer with a saccharide side group and b) of at least one hydrophilic ethylenically unsaturated monomer different from (meth)acrylamide, where the weight fraction of the ethylenically unsaturated monomers with a saccharide side group is 5 to 95% by weight. The copolymers exhibit high affinity to inorganic surfaces or hydrophilic fibers, such as cotton. They serve as soil release and/or graying-inhibiting polymers in textile detergents or minimize the risk of microbial colonization of materials coated therewith.Type: ApplicationFiled: June 16, 2011Publication date: December 22, 2011Applicant: BASF SEInventors: Harald KELLER, Liqun Ren, Roland Ettl, Claudia Esper
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Publication number: 20110237750Abstract: The present invention relates to a process for producing films which are resistant to tear propagation, by using biodegradable polyesters obtainable via polycondensation of: i) from 65 to 80 mol %, based on components i to ii, of one or more dicarboxylic acid derivatives or dicarboxylic acids selected from the group consisting of: succinic acid, adipic acid, sebacic acid, azelaic acid, and brassylic acid; ii) from 35 to 20 mol %, based on components i to ii, of a terephthalic acid derivative; iii) from 98 to 102 mol %, based on components i to ii, of a C2-C8-alkylenediol or C2-C6-oxyalkylenediol; iv) from 0.05 to 2% by weight, based on the polymer obtainable from components i to iii, of an at least trifunctional crosslinking agent or of an at least difunctional chain extender. The invention further relates to polymer mixtures which are suitable for producing films which are resistant to tear propagation.Type: ApplicationFiled: March 24, 2011Publication date: September 29, 2011Applicant: BASF SEInventors: Liqun Ren, Robert Loos
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Publication number: 20110237743Abstract: The present invention relates to a process for producing clingfilms by using biodegradable polyesters obtainable via polycondensation of: i) from 65 to 80 mol %, based on components i to ii, of one or more dicarboxylic acid derivatives or dicarboxylic acids selected from the group consisting of: succinic acid, adipic acid, sebacic acid, azelaic acid, and brassylic acid; ii) from 35 to 20 mol %, based on components i to ii, of a terephthalic acid derivative; iii) from 98 to 102 mol %, based on components i to ii, of a C2-C8-alkylenediol or C2-C6-oxyalkylenediol; iv) from 0.1 to 2% by weight, based on the polymer obtainable from components i to iii, of at least trifunctional crosslinking agent or at least difunctional chain extender. The invention further relates to polymer mixtures which have particular suitability for producing clingfilms, and to clingfilms which comprise biodegradable polyesters.Type: ApplicationFiled: March 24, 2011Publication date: September 29, 2011Applicant: BASF SEInventors: Liqun Ren, Gabriel Skupin
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Publication number: 20110237744Abstract: The present invention relates to a process for producing aqueous dispersions of thermoplastic polymers which have a plurality of ester groups and/or carbonate groups in the main polymer chain and which have an acid number of less than 5 mg KOH/g, in particular at most 3 mg KOH/g, and which have a zero-shear viscosity ?0 (180° C.) of at least 60 Pa·s at 180° C. The invention also relates to the polymer dispersions obtainable by said process, and to the use thereof.Type: ApplicationFiled: March 24, 2011Publication date: September 29, 2011Applicant: BASF SEInventors: Liqun Ren, Gimmy Alex Fernandez Ramirez, Motonori Yamamoto, Hermann Seyffer, Gabriel Skupin
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Publication number: 20110160426Abstract: The invention at hand provides hydrolytically degradable ionic copolymers. These ionic copolymerizates are composed of one cyclic ketene acetal A, one anionic or cationic methacrylic acid derivative B, selected from 2-methyl-methacrylate, [2-(2-methyl-1-methylene-allyloxy)]ethanesulfonate, [2-(2-methyl-1-methylene-allyloxy)ethyl]phosphonate or a quaternary amine of the N,N-dimethylaminoethylmethacrylic acid (DMAEMA) and, optionally, a neutral methacrylic acid derivative C. The hydrolytically degradable anionic copolymers according to the present invention are produced by polymerizing the components A, B and C in the presence of a radical initiator under inert gas atmosphere and subsequent purification. All copolymers according to the present invention are hydrolytically degradable. Copolymers comprising a maximum of 40 mol-% of ester groups in the backbone are additionally biodegradable, wherein in the case of cationic copolymers a maximum of 20 mol-% of quaternized DMAEMA is allowed to be available.Type: ApplicationFiled: April 9, 2009Publication date: June 30, 2011Applicant: PHILIPPS-UNIVERSITAT MARBURGInventors: Andreas Greiner, Seema Agarwal, Thomas Kissel, Liqun Ren