Patents by Inventor Zhifeng Ren

Zhifeng Ren 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).

  • Patent number: 11022256
    Abstract: An LED lamp, comprising a base; a lamp envelope coupled to the base; a support module accommodated in the lamp envelope, a first inner cavity being formed between the support module and the lamp envelope, the first inner cavity containing therein a first gas medium; a driver module accommodated in the first inner cavity and coupled to the support module; and an LED inner vessel accommodated in the first inner cavity and coupled to at least one of the support module and the driver module, a sealed second inner cavity being formed within the LED inner vessel, and the second inner cavity containing therein a second gas medium and an LED light source module.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: June 1, 2021
    Assignee: Savant Technologies LLC
    Inventors: Xiaojun Ren, Kun Xiao, Yimin Zhu, Zhifeng Bao
  • Publication number: 20210155845
    Abstract: A composition composed of highly reactive metal particles that are ball milled, bead milled or blended and dispersed in a solvent with/without polymer for significantly reducing the viscosity of heavy oil for extracting viscous heavy oil, such that the composition reacts with water and oil to produce heat, H2 gas, and hydroxide to lower the oil viscosity and facilitate extraction from an underground formation or transport of heavy oil, such as in a pipe from one place to another place.
    Type: Application
    Filed: November 23, 2020
    Publication date: May 27, 2021
    Applicant: University of Houston System
    Inventors: Zhifeng Ren, Dan Luo
  • Publication number: 20210135184
    Abstract: A method of manufacturing an electrode by disposing a three-dimensional substrate in a metal nitrate solution, drying, and thermally phosphatizing with a phosphorus source under inert gas to form a metal based phosphate catalyst on the substrate. An electrocatalyst and electrode produced via the method are also provided.
    Type: Application
    Filed: March 12, 2018
    Publication date: May 6, 2021
    Applicant: University of Houston System
    Inventors: Zhifeng Ren, Shuo Chen, Fang Yu, Haiqing Zhou
  • Patent number: 10934475
    Abstract: A Janus graphene nanosheet (JGN) surfactant formed from a two-dimensional graphene oxide sheet and functionalized to produce an amphiphilic graphene nanosheet. The JGN may be a component of a nanofluid utilized in nanofluid flooding for oil recovery. The JGN may also be used as solid surfactants to form emulsions for oil recovery.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: March 2, 2021
    Assignee: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Zhifeng Ren, Feng Wang, Dan Luo
  • Patent number: 10930834
    Abstract: Discussed herein are systems and methods for fabrication of MgSnGe-based thermoelectric materials for applications from room temperature and near room temperature to high temperature applications. The TE materials may be fabricated by hand or ball milling a powder to a predetermined particle size and hot-pressing the milled powder to form a thermoelectric component with desired properties including a figure of merit (ZT) over a temperature range. The TE materials fabricated may be disposed in thermoelectric devices for varying applications.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: February 23, 2021
    Assignee: University of Houston System
    Inventors: Zhifeng Ren, Weishu Liu
  • Publication number: 20200377675
    Abstract: A facile and scalable method to prepare graphene-based amphiphilic Janus nanosheets with high efficiency utilizing the formation of hydrogen bonding to immobilize graphene oxide (GO) on the surfaces of starch microspheres. After selective functionalization of the exposed surface using alkylamine, amphiphilic Janus nanosheets (AJN) were obtained by releasing the nanosheets from the starch microspheres.
    Type: Application
    Filed: July 27, 2018
    Publication date: December 3, 2020
    Applicant: University of Houston System
    Inventors: Zhifeng Ren, Dan Luo, Feng Wang
  • Patent number: 10818832
    Abstract: Disclosed are methods for the manufacture of n-type and p-type filled skutterudite thermoelectric legs of an electrical contact. A first material of CoSi2 and a dopant are ball-milled to form a first powder which is thermo-mechanically processed with a second powder of n-type skutterudite to form a n-type skutterudite layer disposed between a first layer and a third layer of the doped-CoSi2. In addition, a plurality of components such as iron, and nickel, and at least one of cobalt or chromium are ball-milled form a first powder that is thermo-mechanically processed with a p-type skutterudite layer to form a p-type skutterudite layer “second layer” disposed between a first and a third layer of the first powder. The specific contact resistance between the first layer and the skutterudite layer for both the n-type and the p-type skutterudites subsequent to hot-pressing is less than about 10.0 ??·cm2.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: October 27, 2020
    Assignees: University of Houston System, Massachusetts Institute of Technology
    Inventors: Qing Jie, Zhifeng Ren, Gang Chen
  • Publication number: 20200231445
    Abstract: A stable water based nanofluid of graphene-based amphiphilic Janus nanosheets, where the nanofluid has a high salt-content while retaining the interfacial activities of the nanosheets. Such a nanofluid of amphiphilic Janus nanosheets may be used for enhanced oil recovery.
    Type: Application
    Filed: September 27, 2018
    Publication date: July 23, 2020
    Applicant: University of Houston System
    Inventors: Zhifeng Ren, Dan Luo, Feng Wang
  • Patent number: 10707397
    Abstract: Materials and systems and methods of manufacture thereof that function as thermoelectric materials both in and near a cryogenic temperature range. In particular, the synthesis of heavy fermion materials that exhibit higher ZTs than previously achieved at cryogenic and near-cryogenic temperatures.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: July 7, 2020
    Assignee: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Zhifeng Ren, Machhindra Koirala
  • Publication number: 20200212448
    Abstract: A method of forming a battery electrode by forming, on a first substrate, a polymer template comprising interconnected polymer fibers, forming, on the polymer template, a carbon coating to form a carbon-coated polymer template, removing the carbon-coated polymer template from the first substrate, subsequent to removing the carbon-coated polymer template from the first substrate, removing the polymer template from the carbon coating, and disposing the carbon coating on a second substrate. A solid electrolyte interphase layer (SEI) comprising the carbon coating produced via the method, a battery electrode comprising such an SEI layer, and a battery comprising such a battery electrode are also provided.
    Type: Application
    Filed: August 24, 2018
    Publication date: July 2, 2020
    Applicant: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Zhifeng Ren, Siya Huang
  • Publication number: 20200024701
    Abstract: Systems and methods of manufacturing a thermoelectric, high performance material by using ball-milling and hot pressing materials according to various formulas, where some formulas substitute a different element for part of one of the elements in the formula, in order to obtain a figure of merit (ZT) suitable for thermoelectric applications.
    Type: Application
    Filed: April 30, 2019
    Publication date: January 23, 2020
    Applicant: University of Houston System
    Inventors: Zhifeng Ren, Huaizhou Zhao, Zhongjia Tang, Jiehe Sui, Yucheng Lan, Qing Jie
  • Patent number: 10533777
    Abstract: Systems and methods disclosed herein are directed towards the fabrication of a solar absorber comprising an IR reflector layer deposited on a substrate; a first cermet layer deposited in contact with the IR reflector layer; a second cermet layer deposited in contact with the first cermet layer; a first anti-reflection coating layer deposited in contact with the second cermet layer; a second anti-reflection coating layer deposited in contact with the first anti-reflection coating layer. A sputtering process may be used to deposit some or all of the layers, and the YSZ layers in each cermet layer may be deposited with a tuned partial oxygen pressure in order to form a layer that is oxygen-deficient.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: January 14, 2020
    Assignees: UNIVERSITY OF HOUSTON SYSTEM, MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Zhifeng Ren, Feng Cao, Daniel Kraemer, Gang Chen
  • Publication number: 20190218674
    Abstract: A hybrid three dimensional (3D) hydrogen evolution reaction (HER) catalyst that is formed from a porous Ni foam support, a NiSe2 scaffold positioned on the support; and layered transition metal dichalcogenide (LTMDC) or first-row transition metal dichalcogenide particles positioned on the NiSe2 scaffold. The catalyst provides a low onset potential, large cathode current density, small Tafel slopes, and large exchange current densities, similar in catalytic power to Pt HER catalysts.
    Type: Application
    Filed: May 17, 2017
    Publication date: July 18, 2019
    Applicant: University of Houston System
    Inventors: Zhifeng REN, Haiqing ZHOU, Fang YU, Shuo CHEN
  • Patent number: 10323305
    Abstract: Systems and methods of manufacturing a thermoelectric, high performance material by using ball-milling and hot pressing materials according to various formulas, where some formulas substitute a different element for part of one of the elements in the formula, in order to obtain a figure of merit (ZT) suitable for thermoelectric applications.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: June 18, 2019
    Assignee: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Zhifeng Ren, Huaizhou Zhao, Zhongjia Tang, Jiehe Sui, Yucheng Lan, Qing Jie
  • Patent number: 10319489
    Abstract: Systems and methods of fabricating electrodes, including thin metallic films, include depositing a first metallic layer on a substrate and passivating the deposited layer. The processes of deposition and passivation may be done sequentially. In some embodiments, a plurality of substrates may be coated with a metallic layer and further processed at a later time, including passivation and disposal of additional layers as discussed herein.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: June 11, 2019
    Assignee: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Zhifeng Ren, Chuanfei Guo, Yuan Liu
  • Patent number: 10316058
    Abstract: A method of extracting biomolecules from live cells comprising: introducing a plurality of magnetized carbon nanotubes (MCNTs) into a live cell, wherein the MCNTs penetrate the cell membrane under a magnetic force; spearing the MCNTs through the cell under the magnetic force, wherein a biomolecule attaches to at least a portion of the MCNTs to form a biomolecule loaded MCNT; removing at least a portion of the biomolecule loaded MCNTs from the cell under the magnetic force; and collecting at least a portion of the biomolecule loaded MCNTs.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: June 11, 2019
    Assignee: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Zhifeng Ren, Dong Cai, Zhen Yang
  • Patent number: 10283690
    Abstract: A method of manufacturing a thermoelectric material comprising: ball-milling a compound comprising a plurality of components, the first component M comprising at least one of a rare earth metal, an actinide, an alkaline-earth metal, and an alkali metal, the second component T comprising a metal of subgroup VIII, and the third component X comprises a pnictogen atom. The compound may be ball-milled for up to 5 hours, and then thermo-mechanically processed by, for example, hot pressing the compound for less than two hours. Subsequent to the thermo-mechanical processing, the compound comprises a single filled skutterudite phase with a dimensionless figure of merit (ZT) above 1.0 and the compound has a composition following a formula of MT4X12.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: May 7, 2019
    Assignees: UNIVERSITY OF HOUSTON SYSTEM, MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Qing Jie, Zhifeng Ren, Gang Chen
  • Patent number: 10243127
    Abstract: Discussed herein are half-Heusler thermoelectric materials including niobium, iron, antimony, and titanium that are formed by ball-milling and hot-pressing the ball-milled power to obtain various thermoelectric properties and an average grain size above 1 ?m.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: March 26, 2019
    Assignee: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: Zhifeng Ren, Ran He
  • Publication number: 20190016943
    Abstract: A Janus graphene nanosheet (JGN) surfactant formed from a two-dimensional graphene oxide sheet and functionalized to produce an amphiphilic graphene nanosheet. The JGN may be a component of a nanofluid utilized in nanofluid flooding for oil recovery. The JGN may also be used as solid surfactants to form emulsions for oil recovery.
    Type: Application
    Filed: July 15, 2016
    Publication date: January 17, 2019
    Applicant: University of Houston System
    Inventors: Zhifeng REN, Feng WANG, Dan LUO
  • Publication number: 20180369140
    Abstract: A method of selectively targeting a cell with a therapeutic agent, the method comprising: targeting a cell with a nanospear, puncturing the cell with said nanospear; releasing a therapeutic agent from said nanospear, wherein said therapeutic agent enters said cell, thereby effecting the efficacy of said cell.
    Type: Application
    Filed: July 9, 2018
    Publication date: December 27, 2018
    Inventors: Zhifeng REN, Dong CAI, Jay-Jiguang ZHU