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).

  • Publication number: 20240165596
    Abstract: The present application pertains to family of new crystalline molecular sieves designated SSZ-93. Molecular sieve SSZ-93 is structurally similar to sieves falling within the MTT structure type such as SSZ-32x, SSZ-32, ZSM-23, EU-13, ISI-4, and KZ-1 family of molecular sieves. SSZ-93 is characterized as having magnesium.
    Type: Application
    Filed: March 24, 2022
    Publication date: May 23, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Adeola OJO, Yihua ZHANG, Guan-Dao LEI, Howard Steven LACHEEN
  • Patent number: 11987757
    Abstract: 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: Grant
    Filed: December 30, 2020
    Date of Patent: May 21, 2024
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Kamala R. Krishna, Yihua Zhang, Guan-Dao Lei, Adeola Florence Ojo
  • Patent number: 11983955
    Abstract: Image fingerprints (embeddings) are generated by an image fingerprinting model and indexed with an approximate nearest neighbors (ANN) model trained to identify the most similar fingerprint based on a subject embedding. For image matching, a score is provided that indicates a similarity between the input embedding and the most similar identified embedding, which allows for matching even when an image has been distorted, rotated, cropped, or otherwise modified. For image classification, the embeddings in the index are clustered and the clusters are labeled. Users can provide just a few images to add to the index as a labeled cluster. The ANN model returns a score and label of the most similar identified embedding for labeling the subject image if the score exceeds a threshold. As improvements are made to the image fingerprinting model, a converter model is trained to convert the original embeddings to be compatible with the new embeddings.
    Type: Grant
    Filed: August 16, 2023
    Date of Patent: May 14, 2024
    Assignee: Netskope, Inc.
    Inventors: Emanoel Daryoush, Jason B. Bryslawskyj, Yi Zhang, Ari Azarafrooz, Wayne Xin, Yihua Liao, Niranjan Koduri
  • Publication number: 20240149250
    Abstract: An improved hydrotreating catalyst and process for making a base oil product wherein the catalyst comprises a base extrudate that includes a high nanopore volume amorphous silica alumina (ASA) and an alumina. The catalyst and process generally involve the use of a high nanopore volume ASA/alumina based catalyst to produce hydrotreated dewaxed base oil products by contacting the catalyst with a hydrocarbon feedstock. The catalyst base extrudate advantageously comprises an amorphous silica alumina having a pore volume in the 11-20 nm pore diameter range of 0.2 to 0.9 cc/g and an alumina having, a pore volume in the 11-20 nm pore diameter range of 0.01 to 1.0 cc/g, with the base extrudate formed from the amorphous silica alumina 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 further comprises at least one modifier element from Groups 6 to 10 and Group 14 of the Periodic Table. The catalyst and process provide improved aromatics saturation.
    Type: Application
    Filed: March 10, 2022
    Publication date: May 9, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Yihua ZHANG, Guan-Dao LEI
  • Publication number: 20240141237
    Abstract: 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: Application
    Filed: December 20, 2021
    Publication date: May 2, 2024
    Inventors: Kamala R. KRISHNA, Yihua ZHANG, Guan-Dao LEI, Adeola OJO
  • Publication number: 20240110120
    Abstract: 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: Application
    Filed: January 18, 2022
    Publication date: April 4, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Yihua ZHANG, Guan-Dao LEI, Malek M. ROSTAMI, Beth A. RUSSELL
  • Patent number: 11947682
    Abstract: 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: Grant
    Filed: July 7, 2022
    Date of Patent: April 2, 2024
    Assignee: Netskope, Inc.
    Inventors: Yi Zhang, Siying Yang, Yihua Liao, Dagmawi Mulugeta, Raymond Joseph Canzanese, Jr., Ari Azarafrooz
  • Publication number: 20240101912
    Abstract: 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: Application
    Filed: November 22, 2021
    Publication date: March 28, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Yihua ZHANG, Adeola OJO, Guan-Dao LEI
  • Publication number: 20240100513
    Abstract: 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: Application
    Filed: December 20, 2021
    Publication date: March 28, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Yihua ZHANG, Adeola OJO, Guan-Dao LEI
  • Publication number: 20240103748
    Abstract: 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: Application
    Filed: September 6, 2023
    Publication date: March 28, 2024
    Inventors: Yihua Zhang, James Cooke
  • Patent number: 11943123
    Abstract: 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: Grant
    Filed: August 31, 2023
    Date of Patent: March 26, 2024
    Assignee: Conviva Inc.
    Inventors: Henry Milner, Oleg Puzyrko, Jibin Zhan, Hui Zhang, Akara Sucharitakul, Vyas Sekar, Yihua Cheng
  • Publication number: 20240076563
    Abstract: 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: Application
    Filed: December 24, 2021
    Publication date: March 7, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Kenneth John PEINADO, Jay PAREKH, Jifei JIA, Yihua ZHANG, Guan-Dao Lei, Guang ZHANG
  • Publication number: 20240076564
    Abstract: 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: Application
    Filed: January 18, 2022
    Publication date: March 7, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Yihua ZHANG, Subhasis BHATTACHARYA, Guan-Dao LEI
  • Publication number: 20240076560
    Abstract: 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: Application
    Filed: December 20, 2021
    Publication date: March 7, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Yihua ZHANG, Guan-Dao LEI, Adeola Florence OJO
  • Publication number: 20240076565
    Abstract: 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: Application
    Filed: January 18, 2022
    Publication date: March 7, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Yihua ZHANG, Guan-Dao LEI
  • Publication number: 20240059987
    Abstract: 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: Application
    Filed: December 24, 2021
    Publication date: February 22, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Kenneth John PEINADO, Jifei JIA, Guan-Dao LEI, Jay PAREKH, Yihua ZHANG
  • Publication number: 20240058802
    Abstract: 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: Application
    Filed: November 11, 2021
    Publication date: February 22, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Yihua ZHANG, Adeola Florence OJO, Guan Dao LEI
  • Patent number: 11873455
    Abstract: 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: Grant
    Filed: December 30, 2020
    Date of Patent: January 16, 2024
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kenny Peinado, Jifei Jia, Guan-Dao Lei, Jay Parekh, Yihua Zhang
  • Patent number: 11865527
    Abstract: 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: Grant
    Filed: January 13, 2021
    Date of Patent: January 9, 2024
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Yihua Zhang, Adeola Florence Ojo, Guan-Dao Lei
  • Patent number: D1016261
    Type: Grant
    Filed: September 9, 2021
    Date of Patent: February 27, 2024
    Inventor: Yihua Zhang