Patents by Inventor Zhengfeng Wang

Zhengfeng Wang 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: 20240385103
    Abstract: A microscopic and macroscopic evaluation method for a dual-effect hydrate inhibitor is provided. The method is applicable to the performance evaluation of traditional thermodynamic inhibitors and kinetic inhibitors. The present invention comprehensively evaluates the dual-effect hydrate inhibitor microscopically and macroscopically through a microscopic evaluation device and a macroscopic evaluation device, thereby more intuitively and efficiently screening out the dual-effect inhibitor with excellent performance. The present invention explains the action mechanism of the dual-effect inhibitor microscopically, accurately evaluate the effects of the inhibitor in two aspects of particle aggregation and particle adhesion, and provide a theoretical basis for screening the dual-effect inhibitor.
    Type: Application
    Filed: March 10, 2023
    Publication date: November 21, 2024
    Applicant: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)
    Inventors: Zhiyuan WANG, Jihao PEI, Baojiang SUN, Zhengfeng SHAN, Longqiao CHEN, Jianbo ZHANG, Shikun TONG
  • Patent number: 11824549
    Abstract: A reference voltage buffer circuit is provided, which could improve the reliability of the reference voltage buffer circuit, including: at least one output branch, where each output branch includes a delay control branch, a first MOSFET, and a second MOSFET; and a feedback branch, where in a first time period, the feedback branch is configured to output a first voltage to the delay control branch, and the delay control branch is configured to control the first MOSFET and the second MOSFET to be turned on, such that a source of the first MOSFET continuously outputs a reference voltage; and in a second time period, a voltage output from the feedback branch to the delay control branch is 0, the delay control branch is configured to control the second MOSFET to be turned off before the first MOSFET is turned off.
    Type: Grant
    Filed: October 5, 2021
    Date of Patent: November 21, 2023
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Junxi Chen, Zhengfeng Wang
  • Publication number: 20220149857
    Abstract: A reference voltage buffer circuit is provided, which could improve the reliability of the reference voltage buffer circuit, including: at least one output branch, where each output branch includes a delay control branch, a first MOSFET, and a second MOSFET; and a feedback branch, where in a first time period, the feedback branch is configured to output a first voltage to the delay control branch, and the delay control branch is configured to control the first MOSFET and the second MOSFET to be turned on, such that a source of the first MOSFET continuously outputs a reference voltage; and in a second time period, a voltage output from the feedback branch to the delay control branch is 0, the delay control branch is configured to control the second MOSFET to be turned off before the first MOSFET is turned off.
    Type: Application
    Filed: October 5, 2021
    Publication date: May 12, 2022
    Inventors: Junxi CHEN, Zhengfeng WANG
  • Patent number: 10921938
    Abstract: A capacitance detecting circuit, includes a first front end circuit, a second front end circuit, a control circuit and a processing circuit, wherein the control circuit controls the first front end circuit and the second front end circuit such that the first front end circuit is configured to convert a capacitance signal of a detection capacitor into a first voltage signal through a first calibration capacitor, and the second front end circuit is configured to convert a capacitance signal of the detection capacitor into a second voltage signal through a second calibration capacitor; the processing circuit is calculates a differential signal of the first voltage signal and the second voltage signal to determine a capacitance variation of the detection capacitor according to the differential signal.
    Type: Grant
    Filed: May 22, 2019
    Date of Patent: February 16, 2021
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Zhengfeng Wang, Shuo Fan
  • Patent number: 10845926
    Abstract: The present application discloses a capacitance detecting circuit, a touch device and terminal device, which are beneficial for reducing an area of the capacitance detecting circuit, thereby reducing costs of a chip. The capacitance detecting circuit is connected to a measurement capacitor and where it includes a calibration capacitor; a charging and discharging module including a first current source configured to perform charging or discharging on the measurement capacitor, and a second current source configured to perform charging or discharging on the calibration capacitor; an integrator, configured to convert a capacitance signal of the measurement capacitor into a voltage signal; and a control module, configured to control working states of the charging and discharging module and the integrator.
    Type: Grant
    Filed: May 22, 2019
    Date of Patent: November 24, 2020
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Zhengfeng Wang, Shuo Fan
  • Publication number: 20200289962
    Abstract: A high-pressure filter is provided, which belongs to the field of filter device technologies, and comprises a trough, a filter disc, a power device, a spiral stirring device, and a compressed air storage tank. A sealed housing is disposed outside the trough, and an inner wall of the sealed housing is connected to an outer wall of the trough to form a sealed cavity. The compressed air storage tank is in communication with the sealed cavity, and compressed air is supplied to the sealed cavity to form a high pressure environment in the sealed cavity. Therefore, a pressure difference is formed between the interior and the exterior of the filter disc to improve the filtering efficiency.
    Type: Application
    Filed: March 11, 2020
    Publication date: September 17, 2020
    Inventor: Zhengfeng WANG
  • Publication number: 20190278401
    Abstract: A capacitance detecting circuit, includes a first front end circuit, a second front end circuit, a control circuit and a processing circuit, wherein the control circuit controls the first front end circuit and the second front end circuit such that the first front end circuit is configured to convert a capacitance signal of a detection capacitor into a first voltage signal through a first calibration capacitor, and the second front end circuit is configured to convert a capacitance signal of the detection capacitor into a second voltage signal through a second calibration capacitor; the processing circuit is calculates a differential signal of the first voltage signal and the second voltage signal to determine a capacitance variation of the detection capacitor according to the differential signal.
    Type: Application
    Filed: May 22, 2019
    Publication date: September 12, 2019
    Inventors: Zhengfeng WANG, Shuo FAN
  • Publication number: 20190272056
    Abstract: The present application discloses a capacitance detecting circuit, a touch device and terminal device, which are beneficial for reducing an area of the capacitance detecting circuit, thereby reducing costs of a chip. The capacitance detecting circuit is connected to a measurement capacitor and where it includes a calibration capacitor; a charging and discharging module including a first current source configured to perform charging or discharging on the measurement capacitor, and a second current source configured to perform charging or discharging on the calibration capacitor; an integrator, configured to convert a capacitance signal of the measurement capacitor into a voltage signal; and a control module, configured to control working states of the charging and discharging module and the integrator.
    Type: Application
    Filed: May 22, 2019
    Publication date: September 5, 2019
    Inventors: Zhengfeng WANG, Shuo FAN
  • Patent number: 7661450
    Abstract: The present invention relates to bamboo manufacturing field, in particular, to a process for making a bamboo filament slab floor by opposite directional hot pressing. Aiming to overcome the defects that, while compressing, the existing bamboo filament slab floor at normal temperature under cold pressing is easy to rebound and expand, has low strength and weak resistance to abrasion and is easy to mildew while using for a long time, the present invention adopts shredding bamboo sheet, sizing treatment, molding bamboo filament and etc. procedures, characterized in that, a secondary drying procedure should be inserted between said sizing treatment and bamboo filament molding procedure; said sizing treatment should be implemented by soak sizing bamboo filament; said compressing includes opposite directional hot pressing of positive pressing and side pressing.
    Type: Grant
    Filed: January 11, 2007
    Date of Patent: February 16, 2010
    Inventor: Zhengfeng Wang
  • Publication number: 20080053570
    Abstract: The present invention relates to bamboo manufacturing field, in particular, to a process for making a bamboo filament slab floor by opposite directional hot pressing. Aiming to overcome the defects that, while compressing, the existing bamboo filament slab floor at normal temperature under cold pressing is easy to rebound and expand, has low strength and weak resistance to abrasion and is easy to mildew while using for a long time, the present invention adopts shredding bamboo sheet, sizing treatment, moulding bamboo filament and etc. procedures, characterized in that, a secondary drying procedure should be inserted between said sizing treatment and bamboo filament moulding procedure; said sizing treatment should be implemented by soak sizing bamboo filament; said compressing includes opposite directional hot pressing of positive pressing and side pressing.
    Type: Application
    Filed: January 11, 2007
    Publication date: March 6, 2008
    Inventor: Zhengfeng Wang