Patents by Inventor Yihua Zhang
Yihua Zhang 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: 20240141237Abstract: Described herein are processes for hydroisomerising an unconventional feedstock using a hydroisomerisation catalyst comprising zeolite SSZ-91, zeolite SSZ-32, or zeolite SSZ-32x to provide a diesel fuel.Type: ApplicationFiled: December 20, 2021Publication date: May 2, 2024Inventors: Kamala R. KRISHNA, Yihua ZHANG, Guan-Dao LEI, Adeola OJO
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Publication number: 20240110120Abstract: A method for making a base oil having enhanced color stability and the base oil prepared therefrom are disclosed. The method comprises adding a phenyl benzotriazole compound to a base oil composition to form a color-stabilized base oil composition. In some cases, the phenyl benzotriazole compound has the structural formula (I): wherein, R and R? are independently one or more substituents selected from hydrogen, substituted and unsubstituted alkyl, substituted and unsubstituted cycloalkyl, substituted and unsubstituted alkoxy, substituted and unsubstituted carboxyl, or a combination thereof, with the proviso that at least one of R and R? is a non-hydrogen substituent.Type: ApplicationFiled: January 18, 2022Publication date: April 4, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Guan-Dao LEI, Malek M. ROSTAMI, Beth A. RUSSELL
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Patent number: 11947682Abstract: The disclosed technology teaches facilitate User and Entity Behavior Analytics (UEBA) by classifying a file being transferred as encrypted or not. The technology involves monitoring movement of a files by a user over a wide area network, detecting file encryption for the files using a trained classifier, wherein the detecting includes processing by the classifier some or all of the following features extracted from each of the files: a chi-square randomness test; an arithmetic mean test; a serial correlation coefficient test; a Monte Carlo-Pi test; and a Shannon entropy test, counting a number of the encrypted files moved by the user in a predetermined period, comparing a predetermined maximum number of encrypted files allowed in the predetermined period to the count of the encrypted files moved by the user and detecting that the user has moved more encrypted files than the predetermined maximum number, and generating an alert.Type: GrantFiled: July 7, 2022Date of Patent: April 2, 2024Assignee: Netskope, Inc.Inventors: Yi Zhang, Siying Yang, Yihua Liao, Dagmawi Mulugeta, Raymond Joseph Canzanese, Jr., Ari Azarafrooz
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Publication number: 20240101912Abstract: An improved hydroisomerization catalyst and process for making a base oil product using a catalyst comprising SSZ-91 molecular sieve and ZSM-12 molecular sieve. The catalyst and process generally involves the use of a catalyst comprising an SSZ-91 molecular sieve combined with a ZSM-12 molecular sieve to produce dewaxed base oil products by contacting the catalyst with a hydrocarbon feedstock. The catalyst and process provide improved base oil cold properties, such as pour point and cloud point, along with other beneficial base oil properties.Type: ApplicationFiled: November 22, 2021Publication date: March 28, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Adeola OJO, Guan-Dao LEI
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Publication number: 20240103748Abstract: Direct data transfer between devices having a shared bus may be implemented with reduced involvement from a controller associated with the devices. A controller, a source memory device, and a target memory device may be coupled with a shared bus. The controller may identify a source address at the source memory device for data to be transferred to the target memory device. The controller also may identify a target address in the target memory device, and initiate a data transfer directly from the source to the target through a command that is received at both the source and the target memory device. In response to the command, the source memory device may read data out to the bus, and the target memory may read the data from the bus and store the data starting at the target address without further commands from the controller.Type: ApplicationFiled: September 6, 2023Publication date: March 28, 2024Inventors: Yihua Zhang, James Cooke
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Publication number: 20240100513Abstract: A method for making a hydroisomerization catalyst having improved thermal stability and metal dispersion characteristics, the catalyst prepared therefrom, and a process for making a base oil product using the catalyst are disclosed. The catalyst is prepared from a composition comprising an SSZ-91 molecular sieve and a rare earth modified alumina, with the composition being modified to contain a Group 8-10 metal, typically through impregnation of a Group 8-10 metal composition. The catalyst may be used to produce dewaxed base oil products by contacting the catalyst under hydroisomerization conditions with a hydrocarbon feedstock.Type: ApplicationFiled: December 20, 2021Publication date: March 28, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Adeola OJO, Guan-Dao LEI
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Patent number: 11943123Abstract: Determining a time-state metric includes receiving a stream of raw data values of an attribute. Each received raw data value of the attribute is associated with a timestamp. It further includes converting the received stream of raw data values into a timeline representation of the attribute over time. The timeline representation comprises a sequence of spans. A span comprises a span start time, a span end time, and a span value. The span value comprises an encoding of one or more values of the attribute over a time interval determined by the span start time and the span end time. It further includes determining a time-state metric according to a timeline request configuration. The timeline request configuration comprises one or more timeline operations. The time-state metric is computed at least in part by performing a timeline operation on the timeline representation of the attribute.Type: GrantFiled: August 31, 2023Date of Patent: March 26, 2024Assignee: Conviva Inc.Inventors: Henry Milner, Oleg Puzyrko, Jibin Zhan, Hui Zhang, Akara Sucharitakul, Vyas Sekar, Yihua Cheng
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Publication number: 20240076563Abstract: Provided in one embodiment is an improved and more flexible process for preparing a finished base oil or a white oil product comprising passing a dewaxed base oil product to a distillation column and separating the dewaxed base oil product into fuel and base oil product streams. The base oil product streams are tested to determine if they meet desired specifications. Base oil product streams that meet the desired minimum base oil specifications are passed to a hydrofinishing reactor to prepare a white oil product, or passed to direct sale.Type: ApplicationFiled: December 24, 2021Publication date: March 7, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Kenneth John PEINADO, Jay PAREKH, Jifei JIA, Yihua ZHANG, Guan-Dao Lei, Guang ZHANG
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Publication number: 20240076564Abstract: Described are processes to produce base oils with one more improved properties, e.g., lower aromatics, economically and/or efficiently. In some embodiments, the processes relate to two stage (or more) hydrofinishing which advantageously provides base oils with lower aromatics than comparable one stage processes.Type: ApplicationFiled: January 18, 2022Publication date: March 7, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Subhasis BHATTACHARYA, Guan-Dao LEI
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Publication number: 20240076560Abstract: Described herein is a process for hydroisomerising a hydrocarbon feed. The process may comprise: combining a hydrocarbon feed and a hydroisomerisation additive to provide a combined feed; and contacting the combined feed with a hydroisomerisation catalyst comprising zeolite SSZ-91, where the hydroisomerisation additive is a substituted or unsubstituted nitrogen heterocycle.Type: ApplicationFiled: December 20, 2021Publication date: March 7, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Guan-Dao LEI, Adeola Florence OJO
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Publication number: 20240076565Abstract: Described are processes to produce base oils with one more improved properties, e.g., lower aromatics, economically and/or efficiently. In some embodiments the processes comprise a step that reduces the amount of residual refractory sulfur compounds prior to or simultaneous with a hydrofinishing step which advantageously provides base oils with lower aromatics than comparable processes.Type: ApplicationFiled: January 18, 2022Publication date: March 7, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Guan-Dao LEI
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Publication number: 20240059987Abstract: Provided is a process for preparing base oil from a waxy hydrocarbon feedstock by contacting the hydrocarbon feedstock in a hydroisomerization zone under hydroisomerization conditions. The reaction is in the presence of hydrogen and an inert gas, with the total pressure in the hydroisomerization zone being at least 400 psig. A product from the hydroisomerization zone is collected and separated into base oil products and fuel products. The inert gas can comprise any suitable inert gas, but is generally nitrogen, methane or argon. Nitrogen is used in one embodiment.Type: ApplicationFiled: December 24, 2021Publication date: February 22, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Kenneth John PEINADO, Jifei JIA, Guan-Dao LEI, Jay PAREKH, Yihua ZHANG
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Publication number: 20240058802Abstract: An improved hydroisomerization catalyst and process for making a base oil product wherein the catalyst comprises a base extrudate that includes SSZ-91 molecular sieve and a high nanopore volume alumina. The catalyst and process generally involves the use of a SSZ-91/high nanopore volume alumina based catalyst to produce dewaxed base oil products by contacting the catalyst with a hydrocarbon feedstock. The catalyst base extrudate advantageously comprises an alumina having a pore volume in the 11-20 nm pore diameter range of 0.05 to 1.0 cc/g, with the base extrudate formed from SSZ-91 and the alumina having a total pore volume in the 2-50 nm pore diameter range of 0.12 to 1.80 cc/g. The catalyst and process provide improved base oil yield with reduced gas and fuels production.Type: ApplicationFiled: November 11, 2021Publication date: February 22, 2024Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Adeola Florence OJO, Guan Dao LEI
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Patent number: 11873455Abstract: Provided is a process for preparing base oil from a waxy hydrocarbon feedstock by contacting the hydrocarbon feedstock in a hydroisomerization zone under hydroisomerization conditions. The reaction is in the presence of hydrogen and an inert gas, with the total pressure in the hydroisomerization zone being at least 400 psig. A product from the hydroisomerization zone is collected and separated into base oil products and fuel products. The inert gas can comprise any suitable inert gas, but is generally nitrogen, methane or argon. Nitrogen is used in one embodiment.Type: GrantFiled: December 30, 2020Date of Patent: January 16, 2024Assignee: Chevron U.S.A. Inc.Inventors: Kenny Peinado, Jifei Jia, Guan-Dao Lei, Jay Parekh, Yihua Zhang
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Patent number: 11865527Abstract: A hydroisomerization catalyst comprising a molecular sieve belonging to the ZSM-48 family of zeolites; an inorganic oxide support; one or more first modifiers selected from Groups 8 to 10; and one or more second modifiers selected from the group consisting of calcium (Ca), chromium (Cr), magnesium (Mg), lanthanum (La), barium (Ba), praseodymium (Pr), strontium (Sr), potassium (K) and neodymium (Nd). The molecular sieve comprises: a silicon oxide to aluminum oxide mole ratio of about 40 to about 220; at least about 70% polytype 6 of the total ZSM-48-type material present in the product; and an additional EUO-type molecular sieve phase in an amount of between about 0 and about 7.0 percent by weight of the total product. The molecular sieve has a morphology characterized as polycrystalline aggregates comprising crystallites collectively having an average aspect ratio of between about 1 and about 8.Type: GrantFiled: January 13, 2021Date of Patent: January 9, 2024Assignee: CHEVRON U.S.A. INC.Inventors: Yihua Zhang, Adeola Florence Ojo, Guan-Dao Lei
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Publication number: 20230415134Abstract: An improved hydroisomerization catalyst system and process for making a base oil product using a combined catalyst system comprising SSZ-91 molecular sieve and SSZ-95 molecular sieve. The catalyst system and process generally involves the use of a catalyst comprising an SSZ-91 molecular sieve and a separate catalyst comprising an SSZ-95 molecular sieve to produce dewaxed base oil products by sequentially contacting the catalysts with a hydrocarbon feedstock. The catalyst system and process provide improved base oil yield along with other beneficial base oil properties.Type: ApplicationFiled: November 11, 2021Publication date: December 28, 2023Applicant: CHEVRON U.S.A. INC.Inventors: Yihua ZHANG, Guan Dao LEI
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Publication number: 20230395166Abstract: Techniques for preventing read disturb in NAND memory devices are described. In one example, reads are tracked for sub-groups. When the number of reads to a sub-group meets a threshold, the data at the wordline on which the threshold was met is moved along with the data at neighboring wordlines to an SLC block without moving the entire block. The performance impact and write amplification impact of read disturb mitigation can be significantly reduced while maintaining some data continuity.Type: ApplicationFiled: August 18, 2023Publication date: December 7, 2023Applicant: Intel CorporationInventors: Arun Sitaram ATHREYA, Shankar NATARAJAN, Sriram NATARAJAN, Yihua ZHANG, Suresh NAGARAJAN
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Patent number: 11814352Abstract: The present disclosure discloses salts formed by 2-(1-acyloxy-n-pentyl)benzoic acid and basic amino acid or aminoguanidine, a preparation method thereof, pharmaceutical preparations containing these salts, and application thereof in preparation of drugs for preventing or treating ischemic cardiovascular and cerebrovascular diseases, resisting thrombosis and improving cardio-cerebral circulation disorders. The compound of the present disclosure has excellent water solubility, aqueous solution stability and pharmacokinetic properties, also has significant anti-platelet aggregation, anti-thrombosis, anti-cerebral ischemia and neuroprotective activity.Type: GrantFiled: December 3, 2018Date of Patent: November 14, 2023Assignee: JIANGSU KANION PHARMACEUTICAL CO., LTD.Inventors: Yihua Zhang, Wei Xiao, Zhangjian Huang, Jianbing Wu, Jiayi Zhu, Zhenzhong Wang, Tuanjie Wang
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Publication number: 20230348798Abstract: An improved process and catalyst system for making a base oil product and for improving base oil cloud point and pour point characteristics, while also providing good product yields. The process and catalyst system generally involves the use of a layered catalyst system comprising an SSZ-91 catalyst and an SSZ-32X catalyst arranged to sequentially contact a hydrocarbon feedstock with both catalysts and thereby provide dewaxed base oil products.Type: ApplicationFiled: August 30, 2021Publication date: November 2, 2023Applicant: CHEVRON U.S.A. INC.Inventors: Subhasis BHATTACHARYA, Yihua ZHANG, Guan-Dao LEI, Ajit R. PRADHAN
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Patent number: D1016261Type: GrantFiled: September 9, 2021Date of Patent: February 27, 2024Inventor: Yihua Zhang