Patents by Inventor Na Xu
Na Xu 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: 20210079153Abstract: The invention relates to an aromatic allophanate polyisocyanate based on aromatic diisocyanates, containing a) ?15 mol-% of allophanate groups, based on the sum of urethane, allophanate and isocyanurate groups, b) ?50 mol-% of isocyanurate groups, based on the sum of urethane, allophanate and isocyanurate groups and c) ?1.5% by weight of monomeric diisocyanates, based on the total weight of the aromatic allophanate polyisocyanate. Furthermore, the invention relates to a process for producing aromatic allophanate polyisocyanates and their use in polyisocyanate compositions or two-component systems.Type: ApplicationFiled: February 11, 2019Publication date: March 18, 2021Inventors: Christoph Irle, Dieter Mager, Hongchao Li, Hao Liu, Ling Yang, Na Xu, Guoping Shi
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Patent number: 10704201Abstract: The present disclosure relates to a dry strength agent composition, use of an amine-containing cationic polymer for enhancing the dry strength of paper, and a method for enhancing the dry strength of paper. The dry strength agent composition includes at least two components. The first component is an amine-containing cationic polymer and the second component may be one or more anionic or amphoteric polymers.Type: GrantFiled: December 30, 2016Date of Patent: July 7, 2020Assignee: ECOLAB USA INC.Inventors: Yulin Zhao, Chunhao Wang, Na Xu, Jun Li, Meng Zhang
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Publication number: 20190301101Abstract: A method of enhancing paper strength properties is provided. The method comprises treating a paper sheet precursor with a polyaluminum salt, and a strengthening agent, wherein the strengthening agent comprises a dialdehyde-modified polyacrylamide copolymer and a polyacrylamide copolymer. The polyaluminum salt may be polyaluminum chloride. The methods have been demonstrated to provide, among other things, improvements in retention, strength, and dewatering.Type: ApplicationFiled: May 31, 2017Publication date: October 3, 2019Applicant: Ecolab USA Inc.Inventors: Meng Zhang, Yulin Zhao, Na Xu
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Patent number: 10408093Abstract: A welded high-pressure fuel pump roller tappet, which is used for the fuel injection system in an engine, includes a guide sleeve, a U-shaped holder and a pin-shaft-roller set. Symmetrical positions on the upper portion of left and right sidewalls of the guide sleeve are provided with inflexed flanges. Two sides of the flange are folded inwardly to form a limiting slot. The U-shaped holder includes a bottom plate and side plates located on left and right sides of the bottom plate. Symmetrical positions on two side plates are provided with axle holes. The pin-shaft-roller set is set up between two side plates of the U-shaped holder. Symmetrical positions on the upper portion of the flange are provided with opening slots. After assembly, the U-shaped holder is located between two flanges. Two side plates are located inside the limiting slots in the flanges.Type: GrantFiled: January 19, 2018Date of Patent: September 10, 2019Assignee: Hangzhou XZB Tech Co., LtdInventors: Na Xu, Haijun Ren, Hua Dong
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Patent number: 10316469Abstract: An on-line control and reaction process for pH adjustment and a control device for automatically adjusting pH value are provided. The process includes mixing a first enhancer and a second enhancer, optionally after diluting the first enhancer and/or the second enhancer with water, to form a mixture, setting a base pH value (?1) and a target pH value (?2), and adding pH adjuster into the mixture via a pH control unit and mixing to obtain a product with the target pH value. The pH control unit adjusts the adding of the pH adjuster by measuring or inputting certain parameters.Type: GrantFiled: December 9, 2015Date of Patent: June 11, 2019Assignee: Ecolab USA Inc.Inventors: Meng Zhang, Na Xu, Jun Li, Yulin Zhao
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Patent number: 10287930Abstract: This invention provides a novel lightweight rocker arm frame and a forming process of a curved crown part thereof, including two sidewalls and two bottom plates. The two sidewalls are connected through the bottom plates respectively located at two ends. A ball socket protruded upwards and an oil hole are arranged at a bottom plate at one end, and a bottom surface of a bottom plate at the other end is a bearing surface. A pin shaft hole is formed in the middle of each sidewall without the bottom plates. According to the rocker arm frame disclosed by the invention, the strength of the structure can be ensured while light weight is realized. The production efficiency of the rocker arm frame is effectively improved, and the structure of the valve rod supporting position is improved.Type: GrantFiled: October 27, 2017Date of Patent: May 14, 2019Assignee: Hangzhou XZB Tech Co., Ltd.Inventors: Na Xu, Haijun Ren
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Publication number: 20190093522Abstract: This invention provides a novel lightweight rocker arm frame and a forming process of a curved crown part thereof, including two sidewalls and two bottom plates. The two sidewalls are connected through the bottom plates respectively located at two ends. A ball socket protruded upwards and an, oil hole are arranged at a bottom plate at one end, and a bottom surface of a bottom plate at the other end is a bearing surface. A pin shaft hole is formed in the middle of each sidewall without the bottom plates. According to the rocker arm frame disclosed by the invention, the strength of the structure can be ensured while light weight is realized. The production efficiency of the rocker arm frame is effectively improved, and the structure of the valve rod supporting position is improved.Type: ApplicationFiled: October 27, 2017Publication date: March 28, 2019Applicant: Hangzhou XZB Tech Co.,LtdInventors: Na XU, Haijun REN
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Publication number: 20190085731Abstract: A welded high-pressure fuel pump roller tappet, which is used for the fuel injection system in an engine, includes a guide sleeve, a U-shaped holder and a pin-shaft-roller set. Symmetrical positions on the upper portion of left and right sidewalls of the guide sleeve are provided with inflexed flanges. Two sides of the flange are folded inwardly to form a limiting slot. The U-shaped holder includes a bottom plate and side plates located on left and right sides of the bottom plate. Symmetrical positions on two side plates are provided with axle holes. The pin-shaft-roller set is set up between two side plates of the U-shaped holder. Symmetrical positions on the upper portion of the flange are provided with opening slots. After assembly, the U-shaped holder is located between two flanges. Two side plates are located inside the limiting slots in the flanges.Type: ApplicationFiled: January 19, 2018Publication date: March 21, 2019Applicant: Hangzhou XZB Tech Co.,LtdInventors: NA XU, HAIJUN REN, HUA DONG
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Patent number: 10215201Abstract: A column type hydraulic tappet includes a housing; a plunger correspondingly installed in the housing; and a high pressure chamber for a hydraulic medium formed between the bottom face of the plunger and the bottom of the housing and is sealed by a check valve opening toward the high pressure chamber. The housing includes an external circumferential groove on the outer diameter for passing the hydraulic medium and an inner circumferential groove on the inner diameter for passing the hydraulic medium. One or more housing oil holes are disposed between the outer circumferential groove and the inner circumferential groove. The plunger includes a sealed hemisphere head portion, a shaft portion and a body portion. An indent neck portion between the head and shaft portions of the plunger has a wall thickness 105%-120% of the wall thickness of the other portions of the plunger.Type: GrantFiled: May 20, 2014Date of Patent: February 26, 2019Assignee: HANGZHOU XZB TECH CO., LTD.Inventor: Na Xu
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Patent number: 10208634Abstract: A columnar-type hydraulic tappet, provided with a housing, a plunger moving axially with respect to the housing being mounted in an inner cavity of the housing, a high pressure cavity used for a hydraulic medium extending between a lower end surface of the plunger and a lower side of the housing, a first ring groove being arranged below a head portion of the plunger, a second ring groove being arranged at a central portion of the plunger, a plunger central wall being between the first ring groove and the second ring groove, the second ring groove being a concave wide ring groove, wherein at least one plunger oil inlet hole being arranged on the plunger concave wide ring groove or the plunger central wall, a bottom portion edge of the plunger oil inlet hole containing flanging facing towards an inner cavity of the plunger.Type: GrantFiled: January 5, 2016Date of Patent: February 19, 2019Assignee: HANGZHOU XZB TECH CO., LTDInventor: Na Xu
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Publication number: 20180320316Abstract: The present disclosure relates to a dry strength agent composition, use of an amine-containing cationic polymer for enhancing the dry strength of paper, and a method for enhancing the dry strength of paper. The dry strength agent composition includes at least two components. The first component is an amine-containing cationic polymer and the second component may be one or more anionic or amphoteric polymers.Type: ApplicationFiled: December 30, 2016Publication date: November 8, 2018Applicant: ECOLAB USA INC.Inventors: Yulin ZHAO, Chunhao WANG, Na XU, Jun LI, Meng ZHANG
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Publication number: 20180298556Abstract: A paper-making aid composition, as well as processes for increasing tensile strength in paper and paper-making processes are provided. The paper-making composition comprises an anionic dialdehyde-modified polyacrylamide and a polyamide polyamine-epichlorohydrin (“PAE”) resin present in the paper-making aid composition at a weight ratio of PAE resin to anionic dialdehyde-modified polyacrylamide of from about 5:1 to about 1:1.6. The processes utilize an anionic dialdehyde-modified polyacrylamide and PAE resin at certain ratios. The anionic dialdehyde-modified polyacrylamide and PAE resin may be added to the pulp slurry as a composition or separately.Type: ApplicationFiled: November 23, 2015Publication date: October 18, 2018Applicant: Ecolab USA Inc.Inventors: Na Xu, Meng Zhang, Yulin Zhao
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Patent number: 9885330Abstract: A high-pressure fuel pump actuator used in an engine, which is used in a fuel injection system of an engine, is mounted on between a driving cam and a fuel pump plunger. The pump actuator includes a guide sleeve, a U-shaped holder, and a pin shaft roller set. The U-shaped holder is formed by stamping the steel plate integrally. The guide sleeve uses a special windowing manner. Both ends of the pin shaft do not need riveting. The structure of the present invention has less number of parts and integrated functions, which can notably reduce the entire weight, the inertial force, the friction, and the abrasion. The operation is steady. The efficiency of the engine is improved.Type: GrantFiled: November 24, 2016Date of Patent: February 6, 2018Assignee: Hangzhou XZB Tech Co., Ltd.Inventor: Na Xu
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Patent number: 9873986Abstract: A paper-making aid composition comprising dialdehyde-modified polyacrylamide-type strengthening agent, polyacrylamide-type strengthening agent and water and having a pH value of 6 or more is provided. A method of paper-making by using the paper-making aid composition is also provided.Type: GrantFiled: September 12, 2014Date of Patent: January 23, 2018Assignee: Ecolab USA Inc.Inventors: Bo Zhu, Na Xu, Meng Zhang, Yulin Zhao
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Patent number: 9873983Abstract: The invention provides a process for paper-making comprising adding to pulp slurry at least a first aqueous liquid and a second aqueous liquid so as to obtain a paper stock; forming the paper stock so as to obtain a wet paper web; pressing and draining the wet paper web so as to obtain a wet paper sheet; and drying the wet paper sheet so as to obtain a paper sheet. Correspondingly, the invention provides an aid composition for paper-making.Type: GrantFiled: September 12, 2014Date of Patent: January 23, 2018Assignee: Ecolab USA Inc.Inventors: Bo Zhu, Meng Zhang, Jun Li, Na Xu, Yulin Zhao
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Patent number: 9869212Abstract: A columnar hydraulic tappet comprises a housing, in which a plunger is correspondingly mounted. A high-pressure chamber extends between a lower end surface of the plunger and a lower side of the housing. An outer ring groove is disposed on the outer diameter of the housing, an inner ring groove is disposed in the radial inner side of the housing, and housing oil feed holes are disposed between the inner ring groove and the outer ring groove. The lower end inside the housing is provided with a grinding wheel groove, an upper end wall of the inner ring groove of the housing is a first internal cylindrical wall, and a housing inner-wall between the lower end of the inner ring groove of the housing and the grinding wheel groove is a second internal cylindrical wall.Type: GrantFiled: February 26, 2015Date of Patent: January 16, 2018Assignee: HANGZHOU XZB TECH CO., LTD.Inventor: Na Xu
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Patent number: 9863382Abstract: A high-pressure oil pump roller tappet, used for automobile fuel injection system, mounted between the driving cam and the tappet. The roller tappet includes a shell, a holder, a roller, and a pin. Planes A are arranged on both sides of the seam on lateral sides of the shell. Holes I are arranged at symmetrical positions on two planes A. Holes II are arranged on symmetrical positions on vertical plates. The roller is located in the middle of the pin. Welding has no requirement on the thickness of the plate. The weight can be controlled effectively, reducing inertia force, friction, and wear, improving engine efficiency. The shell and holder are designed as being separate, ensuring that the shell subjects to lateral force as little as possible when the holder subjects to a force, such that the shell is less likely to vibrate. Thus, the shell avoids the abrasion.Type: GrantFiled: June 24, 2016Date of Patent: January 9, 2018Assignee: Hangzhou XZB Tech Co., LtdInventors: Na Xu, Haijun Ren
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Publication number: 20170342867Abstract: A columnar-type hydraulic tappet, provided with a housing, a plunger moving axially with respect to the housing being mounted in an inner cavity of the housing, a high pressure cavity used for a hydraulic medium extending between a lower end surface of the plunger and a lower side of the housing, a first ring groove being arranged below a head portion of the plunger, a second ring groove being arranged at a central portion of the plunger, a plunger central wall being between the first ring groove and the second ring groove, the second ring groove being a concave wide ring groove, wherein at least one plunger oil inlet hole being arranged on the plunger concave wide ring groove or the plunger central wall, a bottom portion edge of the plunger oil inlet hole containing flanging facing towards an inner cavity of the plunger.Type: ApplicationFiled: January 5, 2016Publication date: November 30, 2017Applicant: HANGZHOU XZB TECH CO., LTDInventor: Na XU
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Publication number: 20170342663Abstract: An on-line control and reaction process for pH adjustment and a control device for automatically adjusting pH value are provided. The process includes mixing a first enhancer and a second enhancer, optionally after diluting the first enhancer and/or the second enhancer with water, to form a mixture, setting a base pH value (?1) and a target pH value (?2), and adding pH adjuster into the mixture via a pH control unit and mixing to obtain a product with the target pH value. The pH control unit adjusts the adding of the pH adjuster by measuring or inputting certain parameters.Type: ApplicationFiled: December 9, 2015Publication date: November 30, 2017Applicant: Ecolab USA Inc.Inventors: Meng Zhang, Na Xu, Jun Li, Yulin Zhao
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Publication number: 20170342951Abstract: A high-pressure oil pump roller tappet, used for automobile fuel injection system, mounted between the driving cam and the tappet. The roller tappet includes a shell, a holder, a roller, and a pin. Planes A are arranged on both sides of the seam on lateral sides of the shell. Holes I are arranged at symmetrical positions on two planes A. Holes II are arranged on symmetrical positions on vertical plates. The roller is located in the middle of the pin. Welding has no requirement on the thickness of the plate. The weight can be controlled effectively, reducing inertia force, friction, and wear, improving engine efficiency. The shell and holder are designed as being separate, ensuring that the shell subjects to lateral force as little as possible when the holder subjects to a force, such that the shell is less likely to vibrate. Thus, the shell avoids the abrasion.Type: ApplicationFiled: June 24, 2016Publication date: November 30, 2017Applicant: Hangzhou XZB Tech Co.,LtdInventors: Na XU, Haijun REN