Patents by Inventor Xuejun Qian
Xuejun Qian 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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Patent number: 11982442Abstract: Disclosed is a system and method for the combustion of biomass material employing a swirling fluidized bed combustion (SFBC) chamber, and preferably a second stage combustion carried out in a cyclone separator. In the combustion chamber, primary air is introduced from a bottom air box that fluidizes the bed material and fuel, and staged secondary air is introduced in the tangential direction and at varied vertical positions in the combustion chamber so as to cause the materials in the combustion chamber (i.e., the mixture of air and particles) to swirl. The secondary air injection can have a significant effect on the air-fuel particle flow in the combustion chamber, and more particularly strengthens the swirling flow, promotes axial recirculation, increases particle mass fluxes in the combustion chamber, and retains more fuel particles in the combustion chamber. This process increases the residence time of the particle flow.Type: GrantFiled: March 9, 2021Date of Patent: May 14, 2024Assignee: Morgan State UniversityInventors: Seong W. Lee, Xuejun Qian, Yulai Yang, Raghul Kumar Chandrasekaran, Oludayo Alamu, Blaise Kalmia
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Publication number: 20240149077Abstract: Retinal disease is responsible for many instances of vision impairment. Often, individuals with vision impaired due to retinal disease continue to have functioning retinal neurons. Thus, systems, methods, and devices to stimulate retinal neurons may restore sight for vision-impaired individuals. Systems, methods, and devices provided herein direct ultrasound energy into retinal neurons and modulate phase and amplitude of ultrasound energy in time and space domains in order to variously stimulate various retinal neurons, generating neural responses consistent with visual reproduction of intended images.Type: ApplicationFiled: January 20, 2022Publication date: May 9, 2024Applicant: UNIVERSITY OF SOUTHERN CALIFORNIAInventors: Mark S. Humayun, Qifa Zhou, Xuejun Qian, Biju Thomas, Gengxi Lu
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Patent number: 11867457Abstract: A hybrid shellfish cooling system employs DC and AC cooling units using both solar power and AC electrical supply as energy sources. As temperature control and uniform temperature distribution in the cooling system are critical factors in reducing vibrio growth on raw oysters and reducing energy consumption, the system is equipped with a divider that optimizes airflow through the cooling system interior cabinet to achieve uniform temperature distribution in six individual internal compartments. Tests indicated that an average of 130 min. cooling was required to reach the suggested oyster temperatures of 7.2° C. and meet the cooling time requirement (i.e., 10 h or less). Airflow is further optimized via fan location and airflow direction, whereby configuration of a circulation fan on a lower part of the 12-volt DC section with an air supply from the 12-volt DC section to the 110-volt AC section achieves relatively uniform temperature distribution.Type: GrantFiled: June 13, 2022Date of Patent: January 9, 2024Assignee: Morgan State UniversityInventors: Seong W. Lee, Xuejun Qian, Yulai Yang
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Publication number: 20220404093Abstract: A hybrid shellfish cooling system employs both DC and AC cooling units that use both solar power and AC electrical supply as energy sources. As temperature control and uniform temperature distribution in the cooling system are critical factors in reducing vibrio growth on raw oysters and reducing energy consumption, the hybrid shellfish cooling system is equipped with a specially configured divider that optimizes airflow through the cooling system interior cabinet to achieve uniform temperature distribution in six individual internal compartments inside of the cooling system. Test results indicated that an average of 130 min. cooling was required to reach the suggested oyster temperatures of 7.2° C. and meet the cooling time requirement (i.e., 10 h or less).Type: ApplicationFiled: June 13, 2022Publication date: December 22, 2022Inventors: Seong W. Lee, Xuejun Qian, Yulai Yang
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Publication number: 20210190311Abstract: Disclosed is a system and method for the combustion of biomass material employing a swirling fluidized bed combustion (SFBC) chamber, and preferably a second stage combustion carried out in a cyclone separator. In the combustion chamber, primary air is introduced from a bottom air box that fluidizes the bed material and fuel, and staged secondary air is introduced in the tangential direction and at varied vertical positions in the combustion chamber so as to cause the materials in the combustion chamber (i.e., the mixture of air and particles) to swirl. The secondary air injection can have a significant effect on the air-fuel particle flow in the combustion chamber, and more particularly strengthens the swirling flow, promotes axial recirculation, increases particle mass fluxes in the combustion chamber, and retains more fuel particles in the combustion chamber. This process increases the residence time of the particle flow.Type: ApplicationFiled: March 9, 2021Publication date: June 24, 2021Inventors: Seong W. Lee, Xuejun Qian, Yulai Yang, Raghul Kumar Chandrasekaran, Oludayo Alamu, Blaise Kalmia
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Patent number: 9522099Abstract: A self-cure, dual-cure or tri-cure polymerizable dental composition is provided with at least one functional chemical. The dental composition is divided into a three-part composition to avoid stability issues caused by degradation and/or loss of function of one component in the extended presence of another component, and the three parts are packaged in a tri-barrel syringe or cartridge delivery system to avoid premature chemical interaction between the functional chemical, redox initiator and/or acid/base.Type: GrantFiled: November 3, 2011Date of Patent: December 20, 2016Assignee: Kerr CorporationInventors: Xuejun Qian, David Tobia
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Patent number: 9408781Abstract: The dental resin modified glass-ionomer composition includes an acidic polymer; an acidic polymerizable monomer selected from 4-(meth)acryloxyalkyltrimellitic anhydride, 4-(meth)acryloxyalkyltrimellitic acid, and a combination thereof; a non-acidic polymerizable monomer; a fluoroaluminosilicate glass filler; water; and at least one polymerization initiator system. The dental resin modified glass-ionomer composition is useful for a dental restorative composition, an endodontic composition, and/or an orthodontic composition, and provides significantly enhanced adhesive property toward tooth structure.Type: GrantFiled: February 11, 2013Date of Patent: August 9, 2016Assignee: Kerr CorporationInventors: Xuejun Qian, Xiangxu Chen
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Patent number: 9399004Abstract: A self-cure or dual-cure polymerizable dental composition is provided with a redox indicator. The composition exhibits an initial first color upon mixing of the two parts and then changes to a second color that is noticeably different from the first color during the curing or polymerization of the composition initiated through the redox initiator system. Advantageously, the first color may be distinctively different from tooth structure and can be easily noticed. The second color may be essentially colorless, a neutral color, or a non-visually observable color in reference to the tooth structure.Type: GrantFiled: November 3, 2011Date of Patent: July 26, 2016Assignee: Kerr CorporationInventors: Xuejun Qian, David Tobia
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Publication number: 20140228474Abstract: The dental resin modified glass-ionomer composition includes an acidic polymer; an acidic polymerizable monomer selected from 4-(meth)acryloxyalkyltrimellitic anhydride, 4-(meth)acryloxyalkyltrimellitic acid, and a combination thereof; a non-acidic polymerizable monomer; a fluoroaluminosilicate glass filler; water; and at least one polymerization initiator system. The dental resin modified glass-ionomer composition is useful for a dental restorative composition, an endodontic composition, and/or an orthodontic composition, and provides significantly enhanced adhesive property toward tooth structure.Type: ApplicationFiled: February 11, 2013Publication date: August 14, 2014Applicant: KERR CORPORATIONInventors: Xuejun Qian, Xiangxu Chen
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Patent number: 8609741Abstract: A dental adhesive composition comprising (i) at least one non-acidic polymerizable monomer having at least one ethylenically unsaturated group, (ii) optionally one or more acidic compounds, (iii) at least one photoinitiator, (iv) at least one solvent, and (v) about 0-40% by weight of one or more fillers; wherein the weight ratio of non-acidic polymerizable monomers/acidic compounds in the adhesive composition is more than about 4.5; the viscosity of the adhesive composition is less than about 350 centipoise (cP) at 25° C.; and the adhesive composition excluding solvent and filler has an acid number of less than about 0.75 mmol NaOH/g. The dental adhesive composition is used with a dental primer composition, which may be provided together in a kit.Type: GrantFiled: October 24, 2012Date of Patent: December 17, 2013Assignee: Kerr CorporationInventor: Xuejun Qian
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Patent number: 8297976Abstract: A dental adhesive composition comprising (i) at least one non-acidic polymerizable monomer having at least one ethylenically unsaturated group, (ii) optionally one or more acidic compounds, (iii) at least one photoinitiator, (iv) at least one solvent, and (v) about 0-40% by weight of one or more fillers; wherein the weight ratio of non-acidic polymerizable monomers/acidic compounds in the adhesive composition is more than about 4.5; the viscosity of the adhesive composition is less than about 350 centipoise (cP) at 25° C.; and the adhesive composition excluding solvent and filler has an acid number of less than about 0.75 mmol NaOH/g. The dental adhesive composition is used with a dental primer composition, which may be provided together in a kit.Type: GrantFiled: June 20, 2011Date of Patent: October 30, 2012Assignee: Kerr CorporationInventor: Xuejun Qian
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Publication number: 20120115106Abstract: A self-cure, dual-cure or tri-cure polymerizable dental composition is provided with at least one functional chemical. The dental composition is divided into a three-part composition to avoid stability issues caused by degradation and/or loss of function of one component in the extended presence of another component, and the three parts are packaged in a tri-barrel syringe or cartridge delivery system to avoid premature chemical interaction between the functional chemical, redox initiator and/or acid/base.Type: ApplicationFiled: November 3, 2011Publication date: May 10, 2012Applicant: KERR CORPORATIONInventors: Xuejun Qian, David Tobia
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Publication number: 20120115978Abstract: A self-cure or dual-cure polymerizable dental composition is provided with a redox indicator. The composition exhibits an initial first color upon mixing of the two parts and then changes to a second color that is noticeably different from the first color during the curing or polymerization of the composition initiated through the redox initiator system. Advantageously, the first color may be distinctively different from tooth structure and can be easily noticed. The second color may be essentially colorless, a neutral color, or a non-visually observable color in reference to the tooth structure.Type: ApplicationFiled: November 3, 2011Publication date: May 10, 2012Applicant: KERR CORPORATIONInventors: Xuejun Qian, David Tobia
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Publication number: 20120115109Abstract: A dental material is provided that exhibits a color change upon or after mixing or contacting components of the composition. The composition includes an acidic component in one part, and a basic component in another part that upon contact with the acidic component initiates a chemical reaction thereof that alters the pH of the composition. An acid or base sensitive color change agent is present in the composition that registers the change in pH by changing color as the pH changes.Type: ApplicationFiled: November 3, 2011Publication date: May 10, 2012Applicant: KERR CORPORATIONInventors: Xiangxu Chen, Xuejun Qian
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Patent number: 8162665Abstract: A dental restorative composition comprises: (A) polymerizable monomer(s) selected from hydroxyethyl (meth)acrylate phosphate, hydroxypropyl (meth)acrylate phosphate, hydroxybutyl (meth)acrylate phosphate, dipentaerythritol penta(meth)acrylate phosphate, pentaerythritol tri(meth)acrylate phosphate, phenyl (meth)acryloxyethyl phosphate, and a combination thereof; (B) polymerizable monomer(s) having a molecular weight of 100-250, at least one hydroxyl group, and at least one ethylenically unsaturated group; (C) polymerizable monomer(s) having a molecular weight of 270-900, at least two ethylenically unsaturated groups and no acidic functional group; (D) photo-initiator(s); and (E) filler(s) each having a mean particle size of more than 0.005 microns and less than 70 microns. The weight ratio of (A+B):(C) ranges from 30:70 to 90:10, and the composition has a shear bond strength of at least 10MPa to both dentin and enamel after being light-cured.Type: GrantFiled: May 18, 2011Date of Patent: April 24, 2012Assignee: Kerr CorporationInventor: Xuejun Qian
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Publication number: 20110250557Abstract: A dental adhesive composition comprising (i) at least one non-acidic polymerizable monomer having at least one ethylenically unsaturated group, (ii) optionally one or more acidic compounds, (iii) at least one photoinitiator, (iv) at least one solvent, and (v) about 0-40% by weight of one or more fillers; wherein the weight ratio of non-acidic polymerizable monomers/acidic compounds in the adhesive composition is more than about 4.5; the viscosity of the adhesive composition is less than about 350 centipoise (cP) at 25° C.; and the adhesive composition excluding solvent and filler has an acid number of less than about 0.75 mmol NaOH/g. The dental adhesive composition is used with a dental primer composition, which may be provided together in a kit.Type: ApplicationFiled: June 20, 2011Publication date: October 13, 2011Applicant: KERR CORPORATIONInventor: Xuejun Qian
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Publication number: 20110217677Abstract: A dental restorative composition comprises: (A) polymerizable monomer(s) selected from hydroxyethyl (meth)acrylate phosphate, hydroxypropyl (meth)acrylate phosphate, hydroxybutyl (meth)acrylate phosphate, dipentaerythritol penta(meth)acrylate phosphate, pentaerythritol tri(meth)acrylate phosphate, phenyl (meth)acryloxyethyl phosphate, and a combination thereof; (B) polymerizable monomer(s) having a molecular weight of 100-250, at least one hydroxyl group, and at least one ethylenically unsaturated group; (C) polymerizable monomer(s) having a molecular weight of 270-900, at least two ethylenically unsaturated groups and no acidic functional group; (D) photo-initiator(s); and (E) filler(s) each having a mean particle size of more than 0.005 microns and less than 70 microns. The weight ratio of (A+B):(C) ranges from 30:70 to 90:10, and the composition has a shear bond strength of at least 10 MPa to both dentin and enamel after being light-cured.Type: ApplicationFiled: May 18, 2011Publication date: September 8, 2011Applicant: KERR CORPORATIONInventor: Xuejun Qian
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Patent number: 7968618Abstract: A one-component self-etching self-priming dental adhesive composition is disclosed. The composition comprises glycerol phosphate di(meth)acrylate monomer, at least one mono-functional polymerizable monomer having just one ethylenically unsaturated group, at least one multi-functional polymerizable monomer having at least two ethylenically unsaturated groups, at least one aprotic solvent, at least one protic solvent, and at least one polymerization initiator.Type: GrantFiled: July 13, 2010Date of Patent: June 28, 2011Assignee: Kerr CorporationInventors: Xiangxu Chen, Xuejun Qian
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Patent number: 7963769Abstract: A dental adhesive composition comprising (i) at least one non-acidic polymerizable monomer having at least one ethylenically unsaturated group, (ii) optionally one or more acidic compounds, (iii) at least one photoinitiator, (iv) at least one solvent, and (v) about 0-40% by weight of one or more fillers; wherein the weight ratio of non-acidic polymerizable monomers/acidic compounds in the adhesive composition is more than about 4.5; the viscosity of the adhesive composition is less than about 350 centipoise (cP) at 25° C.; and the adhesive composition excluding solvent and filler has an acid number of less than about 0.75 mmol NaOH/g. The dental adhesive composition is used with a dental primer composition, which may be provided together in a kit.Type: GrantFiled: October 8, 2007Date of Patent: June 21, 2011Assignee: Kerr CorporationInventor: Xuejun Qian
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Patent number: 7946850Abstract: A dental restorative composition comprising: (A) polymerizable monomer(s) having at least one phosphorus-containing acidic moiety and at least one ethylenically unsaturated group; (B) polymerizable monomer(s) having a molecular weight of 100-250, at least one hydroxyl group, and at least one ethylenically unsaturated group; (C) polymerizable monomer(s) having a molecular weight of 270-900, at least two ethylenically unsaturated groups and no acidic functional group; (D) photo-initiator(s); and (E) filler(s) each having a mean particle size of more than 0.005 microns and less than 70 microns. The weight ratio of (A+B):(C) ranges from 30:70 to 90:10, the concentration of (A) is 10-50 wt. %, the concentration of (B) is 15-60 wt. %, and the composition has a shear bond strength of at least 10 MPa to both dentin and enamel. Also provided is a method for filling a dental cavity with the composition without first treating the dental cavity with an etchant, a primer and/or an adhesive.Type: GrantFiled: August 13, 2008Date of Patent: May 24, 2011Assignee: Kerr CorporationInventor: Xuejun Qian