Patents by Inventor Murali Sarangapani
Murali Sarangapani 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: 20240084472Abstract: A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on its surface, wherein the wire core itself is a silver-based wire core, wherein the coating layer is a double-layer comprised of a 1 to 100 nm thick inner layer of nickel or palladium and an adjacent 1 to 250 nm thick outer layer of gold, characterized in that the wire exhibits a total carbon content of ?40 wt.-ppm.Type: ApplicationFiled: February 5, 2021Publication date: March 14, 2024Inventors: Murali SARANGAPANI, Yee Weon LIM, Wai Khee SEE THO, Mariyappan DHAYALAN, Chee Chow TAN, Juergen SCHARF, Sungsig KANG
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Publication number: 20230374690Abstract: A wire comprising a silver-based wire core having a double-layer coating comprised of an inner layer of palladium or nickel and an adjacent outer layer of gold, wherein the wire exhibits at least one of the intrinsic properties A1) to A3): A1) the average grain size of the crystal grains in the wire core, measured in longitudinal direction, is in the range of from 0.7 to 1.1 ?m; A2) the fraction of twin boundaries, measured in longitudinal direction of the wire, is in the range of from 5 to 40%; and, A3) 20 to 70% of the crystal grains of the wire core are oriented in <100> direction, and 3 to 40% of the crystal grains of the wire core are oriented in <111> direction, each % with respect to the total number of crystal grains with orientation parallel to the drawing direction of the wire.Type: ApplicationFiled: August 10, 2021Publication date: November 23, 2023Inventors: Miew Wan LO, Murali SARANGAPANI
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Patent number: 11791309Abstract: A process for electrically connecting contact surfaces of electronic components by capillary wedge bonding a round wire of 8 to 80 ?m to the contact surface of a first electronic component, forming a wire loop, and stitch bonding the wire to the contact surface of a second electronic component, wherein the wire comprises a wire core having a silver or silver-based wire core with a double-layered coating comprised of a 1 to 50 nm thick inner layer of nickel or palladium and an adjacent 5 to 200 nm thick outer layer of gold.Type: GrantFiled: December 12, 2018Date of Patent: October 17, 2023Assignee: HERAEUS MATERIALS SINGAPORE PTE. LTD.Inventors: Yean Mee Pun, Murali Sarangapani, Xi Zhang, Il Tae Kang, Abito Danila Bayaras, Kim Hui Chong, Sylvia Sutiono, Chee Wei Tok, Tae Yeop James Kim
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Publication number: 20220037284Abstract: A process for electrically connecting contact surfaces of electronic components by capillary wedge bonding a round wire of 8 to 80 ?m to the contact surface of a first electronic component, forming a wire loop, and stitch bonding the wire to the contact surface of a second electronic component, wherein the wire comprises a wire core having a silver or silver-based wire core with a double-layered coating comprised of a 1 to 50 nm thick inner layer of nickel or palladium and an adjacent 5 to 200 nm thick outer layer of gold.Type: ApplicationFiled: December 12, 2018Publication date: February 3, 2022Inventors: Yean M. Pun, Murali Sarangapani, Xi Zhang, Il T. Kang, Abito D. Bayaras, Kim H. Chong, Sylvia Sutiono, Chee W. Tok, Tae Y. Kim
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Patent number: 11236430Abstract: A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on its surface, wherein the wire core itself consists of: (a) pure silver consisting of (a1) silver in an amount in the range of from 99.99 to 100 wt.-% and (a2) further components in a total amount of from 0 to 100 wt.-ppm or (b) doped silver consisting of (b1) silver in an amount in the range of from >99.49 to 99.997 wt.-%, (b2) at least one doping element selected from the group consisting of calcium, nickel, platinum, palladium, gold, copper, rhodium and ruthenium in a total amount of from 30 to <5000 wt.-ppm and (b3) further components in a total amount of from 0 to 100 wt.-ppm, or (c) a silver alloy consisting of (c1) silver in an amount in the range of from 89.99 to 99.5 wt.-%, (c2) at least one alloying element selected from the group consisting of nickel, platinum, palladium, gold, copper, rhodium and ruthenium in a total amount in the range of from 0.5 to 10 wt.Type: GrantFiled: August 18, 2017Date of Patent: February 1, 2022Assignee: HERAEUS MATERIALS SINGAPORE PTE. LTD.Inventors: Yee Weon Lim, Xi Zhang, Senthil Kumar Balasubramanian, Suat Teng Tan, Jin Zhi Liao, Dan Su, Chee Wei Tok, Murali Sarangapani, Jurgen Scharf
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Publication number: 20210222313Abstract: A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on its surface, wherein the wire core itself consists of: (a) pure silver consisting of (a1) silver in an amount in the range of from 99.99 to 100 wt.-% and (a2) further components in a total amount of from 0 to 100 wt.-ppm or (b) doped silver consisting of (b1) silver in an amount in the range of from >99.49 to 99.997 wt.-%, (b2) at least one doping element selected from the group consisting of calcium, nickel, platinum, palladium, gold, copper, rhodium and ruthenium in a total amount of from 30 to <5000 wt.-ppm and (b3) further components in a total amount of from 0 to 100 wt.-ppm, or (c) a silver alloy consisting of (c1) silver in an amount in the range of from 89.99 to 99.5 wt.-%, (c2) at least one alloying element selected from the group consisting of nickel, platinum, palladium, gold, copper, rhodium and ruthenium in a total amount in the range of from 0.5 to 10 wt.Type: ApplicationFiled: August 18, 2017Publication date: July 22, 2021Inventors: Yee Weon Lim, Xi Zhang, Senthil Kumar Balasubramanian, Suat Teng Tan, Jin Zhi Liao, Dan Su, Chee Wei Tok, Murali Sarangapani, Jurgen Scharf
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Patent number: 10960498Abstract: A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on its surface, wherein the wire core includes: (a) pure silver consisting of silver and further components; or (b) doped silver consisting of silver, at least one doping element, and further components; or (c) a silver alloy consisting of silver, palladium and further components; or (d) a silver alloy consisting of silver, palladium, gold, and further components; or (e) a doped silver alloy consisting of silver, palladium, gold, at least one doping element, and further components, wherein the individual amount of any further component is less than 30 wt.-ppm and the individual amount of any doping element is at least 30 wt.-ppm, and the coating layer is a single-layer of gold or palladium or a double-layer comprised of an inner layer of nickel or palladium and an adjacent outer layer of gold.Type: GrantFiled: September 16, 2016Date of Patent: March 30, 2021Assignees: HERAEUS MATERIALS SINGAPORE PTE., LTD., HERAEUS DEUTSCHLAND GMBH & CO. KGInventors: Il Tae Kang, Yong-Deok Tark, Mong Hyun Cho, Jong Su Kim, Hyun Seok Jung, Tae Yeop Kim, Xi Zhang, Murali Sarangapani
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Publication number: 20180345421Abstract: A wire comprising a wire core with a surface, the wire core having a coating layer superimposed on its surface, wherein the wire core includes: (a) pure silver consisting of silver and further components; or (b) doped silver consisting of silver, at least one doping element, and further components; or (c) a silver alloy consisting of silver, palladium and further components; or (d) a silver alloy consisting of silver, palladium, gold, and further components; or (e) a doped silver alloy consisting of silver, palladium, gold, at least one doping element, and further components, wherein the individual amount of any further component is less than 30 wt.-ppm and the individual amount of any doping element is at least 30 wt.-ppm, and the coating layer is a single-layer of gold or palladium or a double-layer comprised of an inner layer of nickel or palladium and an adjacent outer layer of gold.Type: ApplicationFiled: September 16, 2016Publication date: December 6, 2018Applicants: Heraeus Materials Singapore Pte., Ltd., Heraeus Oriental HiTec Co., Ltd.Inventors: Il Tae Kang, Yong-Deok Tark, Mong Hyun Cho, Jong Su Kim, Hyun Seok Jung, Tae Yeop Kim, Xi Zhang, Murali Sarangapani
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Publication number: 20170154863Abstract: A copper wire having a diameter of 10 to 80 ?m is provided. The copper wire bulk material is ?99.99 wt.-% pure copper or a copper alloy consisting of 10 to 1000 wt.-ppm of silver and/or of 0.1 to 3 wt.-% of palladium with copper as the remainder to make up 100 wt.-%, and the copper wire has a 0.5 to <6 nm thin circumferential surface layer of copper oxide.Type: ApplicationFiled: June 17, 2015Publication date: June 1, 2017Applicants: Heraeus Deutschland GmbH & Co. KG, Heraeus Deutschland GmbH & Co. KGInventors: Murali SARANGAPANI, Xi ZHANG, Ping Ha YEUNG, Eugen MILKE
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Patent number: 9589694Abstract: An alloyed 2N copper wire for bonding in microelectronics contains 2N copper and one or more corrosion resistance alloying materials selected from Ag, Ni, Pd, Au, Pt, and Cr. A total concentration of the corrosion resistance alloying materials is between about 0.009 wt % and about 0.99 wt %.Type: GrantFiled: November 30, 2012Date of Patent: March 7, 2017Assignee: Heraeus Deutschland GmbH & Co. KGInventors: Murali Sarangapani, Ping Ha Yeung, Eugen Milke
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Publication number: 20160078980Abstract: The invention is related to a bonding wire containing a core having a surface. The core contains copper as a main component, an average size of crystal grains in the core is between 2.5 ?m and 30 ?m, and a yield strength of the bonding wire is less than 120 MPa.Type: ApplicationFiled: April 4, 2014Publication date: March 17, 2016Inventors: Murali SARANGAPANI, Ping Ha YEUNG, Eugen MILKE
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Patent number: 6860731Abstract: A mold has two mold halves (6, 7). One of the mold halves (6) includes a contact section (8) which is adapted to contact a surface (5) of a semiconductor chip (1) mounted in the mold, in use.Type: GrantFiled: July 9, 2001Date of Patent: March 1, 2005Assignee: ASM Technology Singapore PTE Ltd.Inventors: Shu Chuen Ho, Teng Hock Kuah, Man Ho Hui, Srikanth Narasimulau, Murali Sarangapani
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Publication number: 20030006529Abstract: A mold has two mold halves (6, 7). One of the mold halves (6) includes a contact section (8) which is adapted to contact a surface (5) of a semiconductor chip (1) mounted in the mold, in use.Type: ApplicationFiled: July 9, 2001Publication date: January 9, 2003Applicant: ASM Technology Singapore Pte LtdInventors: Shu Chuen Ho, Teng Hock Kuah, Man Ho Hui, Srikanth Narasimalu, Murali Sarangapani