Patents by Inventor Yonggang Xu
Yonggang 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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Patent number: 10793512Abstract: Disclosed is a preparation method for a racemic adrenaline as represented by formula II. The method comprises the following steps: compound 1 is directly racemized in an acidic solution to produce compound 2, the acid solution comprising neither sodium bisulfite nor salicylic acid; and specifically comprises (a), in the acid solution of which the pH is 0.5-1.5, compound 1 is placed under the protection of nitrogen gas and, with the reaction temperature being controlled at 75-95° C., stirred and reacted for 1-3 hours; (b) the reaction solution is controlled at a temperature of 5-20° C., into which an activated carbon is added, under the protection of nitrogen gas, stirred for 20-40 minutes, and filtered, then a filtrate is collected; the filtrate is controlled at a temperature of 5-20° C., the pH thereof is adjusted using ammonia to 8.5-9.5, and is filtered when the pH is stabilized, and a filter cake is washed and dried to produce a high purity racemic adrenaline white powder.Type: GrantFiled: March 5, 2019Date of Patent: October 6, 2020Assignee: AMPHASTAR NANJING PHARMACEUTICALS INC.Inventors: Yin Wang, Aoxiang Zhang, Yonggang Xu, Song Chen, Haoning Zhang
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Publication number: 20200270199Abstract: A preparation method for a racemic adrenaline as represented by formula II. The method may comprise the following steps: compound 1 is directly racemized in an acidic solution to produce compound 2, the acid solution comprising neither sodium bisulfite nor salicylic acid; and specifically comprises (a), in the acid solution of which the pH is 0.5-1.5, compound 1 is placed under the protection of nitrogen gas and, with the reaction temperature being controlled at 75-95° C., stirred and reacted for 1-3 hours; (b) the reaction solution is controlled at a temperature of 5-20° C., into which an activated carbon is added, under the protection of nitrogen gas, stirred for 20-40 minutes, and filtered, then a filtrate is collected; the filtrate is controlled at a temperature of 5-20° C., the pH thereof is adjusted using ammonia to 8.5-9.5, and is filtered when the pH is stabilized, and a filter cake is washed and dried to produce a high purity racemic adrenaline white powder.Type: ApplicationFiled: March 5, 2019Publication date: August 27, 2020Inventors: Yin WANG, Aoxiang ZHANG, Yonggang XU, Song CHEN, Haoning ZHANG
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Publication number: 20200122977Abstract: An elevator door system comprises a laterally installed door knife located on a car door hanging plate, door lock wheels located on a landing door hanging plate, a fixing plate disposed in a middle of the car door hanging plate. The fixing plate is connected to a transmission belt, so that door hanging plates can be driven to move. A position-limit plate is disposed above the door knife, and the door knife is controlled by the position-limit plate to clamp door lock wheels. At the same time, the door lock wheels are connected to and open a door hanger via a bar. In order to take advantage of the room saved by laterally moving of the door knife, an addition sill and a brush whose lengths are fit for the door opening area are disposed on a car door sill to fill the space when door is opened.Type: ApplicationFiled: October 22, 2018Publication date: April 23, 2020Inventors: Shuxin DU, Yonggang XU, Ai LI
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Publication number: 20190296329Abstract: The present invention provides a power battery and a positive electrode plate thereof. The positive electrode plate includes a positive current collector and a positive active material layer formed on the positive current collector. The positive active material layer contains a mixture of lithium iron phosphate and FeF3, or a mixture of lithium iron phosphate and LiFe2F6, or a mixture of lithium iron phosphate, FeF3 and LiFe2F6. FeF3 or LiFe2F6 has a high gram capacity of more than 200 mAh/g and has a charge and discharge interval close to that of lithium iron phosphate, which can improve the energy density and the safety performance of the power battery.Type: ApplicationFiled: June 10, 2019Publication date: September 26, 2019Inventors: Ruifa Li, Xiaomei Liu, Guopeng Teng, Yonggang Xu, Bo Li
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Publication number: 20190210972Abstract: A method of resolving a racemic mixture of (±)-Huperzine A to (?)-Huperzine A includes: separating the (?)-Huperzine A from the racemic mixture of (±)-Huperzine A by chiral high performance liquid chromatography (HPLC), the chiral HPLC being performed utilizing a mobile phase including a solution including an alcohol and one selected from dichloromethane, trichloromethane, and a mixture thereof, and the chiral HPLC being performed utilizing a chiral stationary phase including a polysaccharide derivative.Type: ApplicationFiled: March 19, 2019Publication date: July 11, 2019Inventors: Yonggang Xu, Hao Wei, Song Chen, Haoning Zhang
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Patent number: 10287249Abstract: A method of resolving a racemic mixture of (±)-Huperzine A to (?)-Huperzine A includes: separating the (?)-Huperzine A from the racemic mixture of (±)-Huperzine A by chiral high performance liquid chromatography (HPLC), the chiral HPLC being performed utilizing a mobile phase including a solution including an alcohol and one selected from dichloromethane, trichloromethane, and a mixture thereof, and the chiral HPLC being performed utilizing a chiral stationary phase including a polysaccharide derivative.Type: GrantFiled: June 26, 2015Date of Patent: May 14, 2019Assignee: Amphastar Pharmaceuticals, Inc.Inventors: Yonggang Xu, Hao Wei, Song Chen, Haoning Zhang
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Patent number: 9873712Abstract: A method for the purification of idraparinux sodium includes: passing a solution including a crude idraparinux sodium through a column including a sodium ion exchange resin to obtain a first mixture; passing a solution including the first mixture through a gel chromatogaphy column to obtain a second mixture; and precipitating a purified idraparinux sodium from a solution including the second mixture.Type: GrantFiled: May 15, 2015Date of Patent: January 23, 2018Assignee: Amphastar Pharmaceuticals, Inc.Inventors: Jundong Meng, Yonggang Xu, Wencun Wang, Song Chen, Haoning Zhang
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Publication number: 20160096856Abstract: A method for the purification of idraparinux sodium includes: passing a solution including a crude idraparinux sodium through a column including a sodium ion exchange resin to obtain a first mixture; passing a solution including the first mixture through a gel chromatogaphy column to obtain a second mixture; and precipitating a purified idraparinux sodium from a solution including the second mixture.Type: ApplicationFiled: May 15, 2015Publication date: April 7, 2016Inventors: Jundong Meng, Yonggang Xu, Wencun Wang, Song Chen, Haoning Wang
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Publication number: 20160096808Abstract: A method of resolving a racemic mixture of (±)-Huperzine A to (?)-Huperzine A includes: separating the (?)-Huperzine A from the racemic mixture of (±)-Huperzine A by chiral high performance liquid chromatography (HPLC), the chiral HPLC being performed utilizing a mobile phase including a solution including an alcohol and one selected from dichloromethane, trichloromethane, and a mixture thereof, and the chiral HPLC being performed utilizing a chiral stationary phase including a polysaccharide derivative.Type: ApplicationFiled: June 26, 2015Publication date: April 7, 2016Inventors: Yonggang Xu, Hao Wei, Song Chen, Haoning Zhang
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Patent number: 9066231Abstract: In a method for 802.1X authentication, used in a network which comprises an access device and an access control device, a WLAN security template and a 802.1X client template is enabled at the access device, a 802.1X client template is enabled at the access device, and a 802.1X device template is enabled at a tunnel port of the access control device. The access control device establishes a 802.1X authentication tunnel with the access device, receive a packet transmitted by a client at the access control device through the 802.1X authentication tunnel, authenticates the client after receiving the packet, and assists the access device through the 802.1X authentication tunnel to obtain a session key.Type: GrantFiled: June 2, 2011Date of Patent: June 23, 2015Assignee: HANGZHOU H3C TECHNOLOGIES CO., LTD.Inventors: Yongfu Chai, Yonggang Xu
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Patent number: 8996033Abstract: Embodiments of the invention relate to methods and systems for associating a mobile device to a household. In various embodiments, a plurality of latitude-longitude pairs is received for a mobile device during a time period. The latitude-longitude pairs are organized into a plurality of clusters corresponding to geographic regions visited by the mobile device during the time period. For each cluster, a score is calculated that represents a likelihood that a user of the mobile device resides in a household within the cluster. The cluster with the highest score is identified as being the location of the user's household. The computation is preferably conducted recursively over time periods. The mobile device is then associated with the user's household.Type: GrantFiled: October 3, 2014Date of Patent: March 31, 2015Assignee: 4INFO, Inc.Inventors: Yonggang Xu, Tim Jenkins
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Patent number: 8880097Abstract: Embodiments of the invention relate to methods and systems for associating a mobile device to a household. In various embodiments, a plurality of latitude-longitude pairs is received for a mobile device during a time period. The latitude-longitude pairs are organized into a plurality of clusters corresponding to geographic regions visited by the mobile device during the time period. For each cluster, a score is calculated that represents a likelihood that a user of the mobile device resides in a household within the cluster. The cluster with the highest score is identified as being the location of the user's household. The computation is preferably conducted recursively over time periods. The mobile device is then associated with the user's household.Type: GrantFiled: March 21, 2014Date of Patent: November 4, 2014Assignee: 4INFO, Inc.Inventors: Yonggang Xu, Tim Jenkins
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Patent number: 8792909Abstract: Embodiments of the invention relate to methods and systems for associating a mobile device to a household. In various embodiments, a plurality of latitude-longitude pairs is received for a mobile device during a time period. The latitude-longitude pairs are organized into a plurality of clusters corresponding to geographic regions visited by the mobile device during the time period. For each cluster, a score is calculated that represents a likelihood that a user of the mobile device resides in a household within the cluster. The cluster with the highest score is identified as being the location of the user's household. The computation is preferably conducted recursively over time periods. The mobile device is then associated with the user's household.Type: GrantFiled: December 4, 2013Date of Patent: July 29, 2014Assignee: 4 Info, Inc.Inventors: Yonggang Xu, Tim Jenkins
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Publication number: 20130212394Abstract: In a method for 802.1X authentication, used in a network which comprises an access device and an access control device, a WLAN security template and a 802.1X client template is enabled at the access device, a 802.1X client template is enabled at the access device, and a 802.1X device template is enabled at a tunnel port of the access control device. The access control device establishes a 802.1X authentication tunnel with the access device, receive a packet transmitted by a client at the access control device through the 802.1X authentication tunnel, authenticates the client after receiving the packet, and assists the access device through the 802.1X authentication tunnel to obtain a session key.Type: ApplicationFiled: June 2, 2011Publication date: August 15, 2013Applicant: Hangzhou H3C technologies Co., Ltd.Inventors: Yongfu Chai, Yonggang Xu
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Patent number: 7835937Abstract: Methods and systems consistent with the present invention enable the control of aspects of an advertising campaign, such as revenue expenditure, by comparing actual and desired behavior and incorporating feedback and feed-forward error correction to continuously adjust the campaign's behavior. In certain embodiments, this control is achieved without considering individual advertisement requests or ad placements, thus bypassing the lowest-level details and instead adjusting behavior on a campaign-wide level using an adaptive control system.Type: GrantFiled: October 15, 2007Date of Patent: November 16, 2010Assignee: AOL Advertising Inc.Inventors: Niklas Karlsson, Jianlong Zhang, Yonggang Xu
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Publication number: 20100262455Abstract: A system is provided for managing the delivery of online advertisements across inventory units of an online advertising campaign. The system includes a sensor configured to detect current ad volume for an inventory unit of the online advertising campaign. The system also includes a campaign controller configured to generate a reference ad volume for the inventory unit, based on instructions and the detected ad volume; and a unit actuator configured to generate updated ad delivery control settings for the inventory unit, based on the reference ad volume and the detected ad volume. The system also includes a serving unit configured to serve an ad impression on the inventory unit based on the updated ad delivery control settings, wherein the reference ad volume is generated based on a proportion of ad volume served on the inventory unit compared to other inventory units of the online advertising campaign.Type: ApplicationFiled: April 10, 2009Publication date: October 14, 2010Inventors: Niklas Karlsson, Yonggang Xu