Patents by Inventor Chun Kwan Tsang
Chun Kwan Tsang 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: 11984285Abstract: A fuse device may include a PPTC body; a first electrode, disposed on a first side of the PPTC body; and a second electrode, disposed on a second side of the PPTC body. The PPTC body may comprise a polymer matrix and a conductive filler, wherein the fuse device has a trip temperature of less than 120° C.Type: GrantFiled: June 16, 2021Date of Patent: May 14, 2024Assignee: Littelfuse, Inc.Inventors: Jianhua Chen, Chun Kwan Tsang
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Publication number: 20240096581Abstract: A method for producing an arc quenching fuse filler including providing a conventional fuse filler material, mixing a binder agent with the conventional fuse filler material, mixing an arc quenching promotor with the conventional fuse filler material and binder agent, and curing the binder agent, whereby granules of the arc quenching promotor are bound to granules of the conventional fuse filler material.Type: ApplicationFiled: October 26, 2020Publication date: March 21, 2024Applicant: Littelfuse, Inc.Inventors: Chun-Kwan Tsang, Gordon Todd Dietsch, Irma Valeriano Santos
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Patent number: 11881337Abstract: A novel polymer positive temperature coefficient (PPTC) material, device, and method of fabrication. One example of polymer positive temperature coefficient (PPTC) includes a polymer matrix, the polymer matrix comprising a first polymer. The PPTC material may further include a conductive filler, disposed in the polymer matrix; and at least one polymer filler, dispersed within the polymer matrix. The at least one polymer filler may comprise a second polymer, different from the first polymer, wherein the at least one polymer comprises a first melting temperature, and wherein the second polymer comprises a second melting temperature, the second melting temperature exceeding the first melting temperature by at least 20 C.Type: GrantFiled: November 23, 2018Date of Patent: January 23, 2024Assignee: Littelfuse Electronics (Shanghai) Co., Ltd.Inventors: Jianhua Chen, Chun-Kwan Tsang, Zhiyong Zhou, Yingsong Fu, Edward W. Rutter, Jr.
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Publication number: 20230371520Abstract: An antimicrobial polymer composite is described. The antimicrobial polymer composite comprises a polymer, at least one antimicrobial additive, at least one flame retardant and at least one hydrophobic additive. An apparatus formed from an antimicrobial polymer composite is also described.Type: ApplicationFiled: May 23, 2022Publication date: November 23, 2023Applicants: TE Connectivity Solutions GmbH, Tyco Electronics UK LtdInventors: Lei WANG, Yiliang WU, Ting GAO, Kaylie Jane SMITH, Chun Kwan Tsang
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Publication number: 20230374260Abstract: An antimicrobial product comprising an inner layer and an outer layer surrounding said inner layer wherein said inner layer is crosslinked. The outer layer includes at least one antimicrobial additive. A process of forming such antimicrobial product using extrusion is described.Type: ApplicationFiled: May 23, 2022Publication date: November 23, 2023Applicants: TE Connectivity Solutions GmbH, Tyco Electronics UK LtdInventors: Kaylie Jane SMITH, Lei WANG, Yiliang WU, Ting GAO, Chun Kwan Tsang
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Patent number: 11823821Abstract: The present invention relates to a polymer voltage-dependent resistor (PVDR) in various physical forms and methods for manufacturing the varistor. The body of the PVDR is composed of a polymer matrix having a filler composed of doped zinc oxide particles, other semi conductive particles or metal particles uniformly distributed therein. Conductive electrodes may be affixed to the polymer matrix and electrical leads attached to the electrodes.Type: GrantFiled: November 15, 2022Date of Patent: November 21, 2023Assignee: Dongguan Littelfuse Electronics Company LimitedInventors: Chun-Kwan Tsang, Jianhua Chen, Yi-Hua Deng
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Patent number: 11763968Abstract: A polymeric positive temperature coefficient (PPTC) device including a PPTC body, a first electrode disposed on a first side of the PPTC body, and a second electrode disposed on a second side of the PPTC body, wherein the PPTC body is formed of a PPTC material that includes a polymer matrix and a conductive filler, wherein the conductive filler defines 20%-39% by volume of the PPTC material.Type: GrantFiled: October 9, 2020Date of Patent: September 19, 2023Assignee: Littelfuse, Inc.Inventors: Jianhua Chen, Chun Kwan Tsang
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Patent number: 11615899Abstract: The present invention relates to a polymer voltage-dependent resistor (PVDR) in various physical forms and methods for manufacturing the varistor. The body of the PVDR is composed of a polymer matrix having a filler composed of doped zinc oxide particles, other semi conductive particles or metal particles uniformly distributed therein. Conductive electrodes may be affixed to the polymer matrix and electrical leads attached to the electrodes.Type: GrantFiled: October 12, 2018Date of Patent: March 28, 2023Assignee: DONGGUAN LITTELFUSE ELECTRONICS COMPANY LIMITEDInventors: Chun-Kwan Tsang, Jianhua Chen, Yi-hua Deng
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Publication number: 20230076752Abstract: The present invention relates to a polymer voltage-dependent resistor (PVDR) in various physical forms and methods for manufacturing the varistor. The body of the PVDR is composed of a polymer matrix having a filler composed of doped zinc oxide particles, other semi conductive particles or metal particles uniformly distributed therein. Conductive electrodes may be affixed to the polymer matrix and electrical leads attached to the electrodes.Type: ApplicationFiled: November 15, 2022Publication date: March 9, 2023Applicant: Dongguan Littelfuse Electronics Company LimitedInventors: Chun-Kwan Tsang, Jianhua Chen, Yi-hua Deng
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Publication number: 20220122799Abstract: A fuse including an electrically insulating, tubular fuse body, electrically conductive first and second endcaps disposed over opposing ends of the fuse body, a fusible element extending through the fuse body and connecting the first endcap to the second endcap, the fusible element having a central portion adapted to melt and separate upon an overcurrent condition in the fuse, and first and second arc barriers disposed on the fusible element on opposing sides of the central portion, the first and second arc barriers formed of a silicone composition that includes an arc quenching filler suspended in a silicone resin.Type: ApplicationFiled: August 27, 2021Publication date: April 21, 2022Applicant: Littelfuse, Inc.Inventors: Chun-Kwan Tsang, Todd Dietsch
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Publication number: 20220013259Abstract: A novel polymer positive temperature coefficient (PPTC) material, device, and method of fabrication. One example of polymer positive temperature coefficient (PPTC) includes a polymer matrix, the polymer matrix comprising a first polymer. The PPTC material may further include a conductive filler, disposed in the polymer matrix; and at least one polymer filler, dispersed within the polymer matrix. The at least one polymer filler may comprise a second polymer, different from the first polymer, wherein the at least one polymer comprises a first melting temperature, and wherein the second polymer comprises a second melting temperature, the second melting temperature exceeding the first melting temperature by at least 20 C.Type: ApplicationFiled: November 23, 2018Publication date: January 13, 2022Applicant: Littelfuse Electronics (Shanghai) Co., Ltd.Inventors: Jianhua Chen, Chun-Kwan Tsang, Zhiyong Zhou, Yingsong Fu, Edward W. Rutter, Jr.
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Publication number: 20210358662Abstract: The present invention relates to a polymer voltage-dependent resistor (PVDR) in various physical forms and methods for manufacturing the varistor. The body of the PVDR is composed of a polymer matrix having a filler composed of doped zinc oxide particles, other semi conductive particles or metal particles uniformly distributed therein. Conductive electrodes may be affixed to the polymer matrix and electrical leads attached to the electrodes.Type: ApplicationFiled: October 12, 2018Publication date: November 18, 2021Inventors: Chun-Kwan Tsang, Jianhua Chen, Yi-hua Deng
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Publication number: 20210313097Abstract: Polymeric positive temperature coefficient (PPTC) bodies and fuse devices formed therefrom are described. In various embodiments, the PPTC bodies comprise a matrix polymer and a conductive filler comprising a compound of general formula Mn+1AXn, where M is a transition d metal element, A is a p-block element, X is carbon or nitrogen, and n is 1, 2 or 3.Type: ApplicationFiled: March 15, 2021Publication date: October 7, 2021Applicant: Littelfuse, Inc.Inventors: Chun-Kwan Tsang, Jianhua Chen, Ann O. Banich
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Publication number: 20210313135Abstract: A fuse device may include a PPTC body; a first electrode, disposed on a first side of the PPTC body; and a second electrode, disposed on a second side of the PPTC body. The PPTC body may comprise a polymer matrix and a conductive filler, wherein the fuse device has a trip temperature of less than 120° C.Type: ApplicationFiled: June 16, 2021Publication date: October 7, 2021Inventors: Jianhua Chen, Chun Kwan Tsang
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Patent number: 11127554Abstract: A fuse device including a fuse component, a first electrode, disposed on a first side of the fuse component, a second electrode, disposed on a second side of the fuse component, and a phase change component, disposed in thermal contact with the fuse component. The fuse component may comprise a fuse temperature, wherein the phase change component exhibits a phase change temperature, the phase change temperature marking a phase transition of the phase change component, and wherein the phase change temperature is less than the fuse temperature.Type: GrantFiled: December 30, 2019Date of Patent: September 21, 2021Assignee: Littelfuse, Inc.Inventors: Chun-Kwan Tsang, Jianhua Chen
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Patent number: 11037708Abstract: A PPTC assembly may include a PPTC component, having a trip temperature, and further comprising a first temperature coefficient of resistance, in a low temperature range below the trip temperature. The PPTC assembly may include a resistive component, disposed in electrical contact with the PPTC component on a first side of the PPTC component, the resistive component comprising an electrical conductor, and having a second temperature coefficient of resistance in the low temperature range, less than the first temperature coefficient of resistance. The PPTC component may include a first electrode, electrically coupled to the first side of the PPTC component, and a second electrode, electrically coupled to the second side of the PPTC component, where the PPTC component and the resistive component are arranged in electrical series between the first electrode and the second electrode.Type: GrantFiled: July 1, 2019Date of Patent: June 15, 2021Assignee: Littelfuse, Inc.Inventors: Jianhua Chen, Chun Kwan Tsang
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Publication number: 20210110953Abstract: Structurally supported electrical transient materials are disclosed. Furthermore, methods to provide structurally supported electrical transient materials are disclosed. In one implementation, a structurally supported electrical transient material includes a support structure that is at least partially covered by an electrical transient material. In one example, the support structure is a mesh material integrated at least partially in the electrical transient material.Type: ApplicationFiled: March 31, 2017Publication date: April 15, 2021Applicant: Dongguan Littelfuse Electronics Company LimitedInventors: Jianhua Chen, Chun-Kwan Tsang, Hao Cheng, Deepak Nayar
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Publication number: 20210082603Abstract: A polymeric positive temperature coefficient (PPTC) device including a PPTC body, a first electrode disposed on a first side of the PPTC body, and a second electrode disposed on a second side of the PPTC body, wherein the PPTC body is formed of a PPTC material that includes a polymer matrix and a conductive filler, wherein the conductive filler defines 20%-39% by volume of the PPTC material.Type: ApplicationFiled: October 9, 2020Publication date: March 18, 2021Applicant: Littelfuse, Inc.Inventors: Jianhua Chen, Chun Kwan Tsang
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Publication number: 20210005362Abstract: A PPTC assembly may include a PPTC component, having a trip temperature, and further comprising a first temperature coefficient of resistance, in a low temperature range below the trip temperature. The PPTC assembly may include a resistive component, disposed in electrical contact with the PPTC component on a first side of the PPTC component, the resistive component comprising an electrical conductor, and having a second temperature coefficient of resistance in the low temperature range, less than the first temperature coefficient of resistance. The PPTC component may include a first electrode, electrically coupled to the first side of the PPTC component, and a second electrode, electrically coupled to the second side of the PPTC component, where the PPTC component and the resistive component are arranged in electrical series between the first electrode and the second electrode.Type: ApplicationFiled: July 1, 2019Publication date: January 7, 2021Applicant: Littelfuse, Inc.Inventors: Jianhua Chen, Chun Kwan Tsang
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Patent number: 10886087Abstract: An overcurrent protection device according to an embodiment of the present disclosure may include a first electrode disposed substantially parallel to a second electrode. A material may be disposed between the first electrode and the second electrode. A plurality of conductive material nodules may be disposed in the material between the first electrode and the second electrode, including a first conductive material nodule at least partially contacting an inner surface of the first electrode and a second conductive material nodule at least partially contacting an inner surface of the second electrode and the first conductive material nodule. In response to an overcurrent condition the material may be configured to expand, such that the contact between the first electrode, the first conductive material nodule, the second conductive material nodule, and the second electrode is at least partially interrupted.Type: GrantFiled: November 2, 2017Date of Patent: January 5, 2021Assignee: Littelfuse, Inc.Inventors: Martin G. Pineda, Sergio Fuentes, Chun-Kwan Tsang