Patents by Inventor Masashi Totokawa
Masashi Totokawa 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: 20210138763Abstract: A bonded structure has a first bonded member with a first bonding surface, a second bonded member with a second bonding surface, and a bonding resin layer containing a polymer, disposed between the first bonding surface and the second bonding surface. The polymer in the bonding resin layer has polymer main chains oriented in an intersecting direction that intersects with the first bonding surface and the second bonding surface. The intersecting direction preferably extends along the thickness direction of the bonding resin layer. A heat exchanger has the bonded structure, and the first bonded member serves as a tubular member, and the second bonded member serves as a heat dissipation fin.Type: ApplicationFiled: January 15, 2021Publication date: May 13, 2021Inventors: Masami SAITO, Koji KONDO, Masashi TOTOKAWA, Hirotaka MIYANO, Yoshitake SUGANUMA, Kenichi YAGI, Yuichi KATO, Kunio MORI, Katsuhito MORI, Taiga HANDA
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Patent number: 10272491Abstract: In a manufacturing method of a soft magnetic member, a material powder that includes ferrous particles and an organic layer formed on a surface of each of the ferrous particles is prepared. The organic layer contains at least one element selected from the group consisting of Si, Mg, Ti, and V. The material powder is compacted to form a green compact, and the green compact is induction-heated with a frequency of 100 kHz or higher to form an insulation layer made of an oxide containing the element on the surface of each of the ferrous particles.Type: GrantFiled: November 6, 2014Date of Patent: April 30, 2019Assignee: DENSO CORPORATIONInventors: Eiichi Kobayashi, Kunihiro Kodama, Masashi Totokawa, Satoshi Takeuchi
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Patent number: 10252338Abstract: In S102, after preforming a pressed powder member by compressing metal powder filled in a press-forming portion, the pressed powder member and metal member are slid to each other in S103. In S104, after temporarily joining the pressed powder member and the metal member by further pressurizing the powder member, the temporary joined pressed powder member and the metal member are sintered in a sintering furnace, and the pressed powder member and the metal member are joined by sintering diffusion in S105. Thereby, joining areas between the pressed powder member and the metal member are increased, and it is possible to improve a joining strength between the pressed powder member and the metal member.Type: GrantFiled: June 23, 2015Date of Patent: April 9, 2019Assignee: DENSO CORPORATIONInventors: Eiichi Kobayashi, Kunihiro Kodama, Masashi Totokawa
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Publication number: 20160001367Abstract: In S102, after preforming a pressed powder member by compressing metal powder filled in a press-forming portion, the pressed powder member and metal member are slid to each other in S103. In S104, after temporarily joining the pressed powder member and the metal member by further pressurizing the powder member, the temporary joined pressed powder member and the metal member are sintered in a sintering furnace, and the pressed powder member and the metal member are joined by sintering diffusion in S105. Thereby, joining areas between the pressed powder member and the metal member are increased, and it is possible to improve a joining strength between the pressed powder member and the metal member.Type: ApplicationFiled: June 23, 2015Publication date: January 7, 2016Inventors: Eiichi Kobayashi, Kunihiro Kodama, Masashi Totokawa
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Publication number: 20150129794Abstract: In a manufacturing method of a soft magnetic member, a material powder that includes ferrous particles and an organic layer formed on a surface of each of the ferrous particles is prepared. The organic layer contains at least one element selected from the group consisting of Si, Mg, Ti, and V. The material powder is compacted to form a green compact, and the green compact is induction-heated with a frequency of 100 kHz or higher to form an insulation layer made of an oxide containing the element on the surface of each of the ferrous particles.Type: ApplicationFiled: November 6, 2014Publication date: May 14, 2015Inventors: Eiichi KOBAYASHI, Kunihiro KODAMA, Masashi TOTOKAWA, Satoshi TAKEUCHI
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Patent number: 8703517Abstract: In a manufacturing method of a semiconductor device, a substrate including single crystalline silicon is prepared, a reformed layer that continuously extends is formed in the substrate, and the reformed layer is removed by etching. The forming the reformed layer includes polycrystallizing a portion of the single crystalline silicon by irradiating the substrate with a pulsed laser beam while moving a focal point of the laser beam in the substrate.Type: GrantFiled: October 24, 2011Date of Patent: April 22, 2014Assignee: DENSO CORPORATIONInventors: Atsushi Taya, Katsuhiko Kanamori, Masashi Totokawa
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Patent number: 8603920Abstract: A manufacturing method of a semiconductor device includes: irradiating a laser beam on a single crystal silicon substrate, and scanning the laser beam on the substrate so that a portion of the substrate is poly crystallized, wherein at least a part of a poly crystallized portion of the substrate is exposed on a surface of the substrate; and etching the poly crystallized portion of the substrate with an etchant. In this case, a process time is improved.Type: GrantFiled: August 5, 2010Date of Patent: December 10, 2013Assignee: DENSO CORPORATIONInventors: Katsuhiko Kanamori, Masashi Totokawa, Hiroshi Tanaka
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Publication number: 20120107994Abstract: In a manufacturing method of a semiconductor device, a substrate including single crystalline silicon is prepared, a reformed layer that continuously extends is formed in the substrate, and the reformed layer is removed by etching. The forming the reformed layer includes polycrystallizing a portion of the single crystalline silicon by irradiating the substrate with a pulsed laser beam while moving a focal point of the laser beam in the substrate.Type: ApplicationFiled: October 24, 2011Publication date: May 3, 2012Applicant: DENSO CORPORATIONInventors: Atsushi TAYA, Katsuhiko Kanamori, Masashi Totokawa
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Patent number: 8151649Abstract: A physical quantity sensor device (10) having a structure in which a stress-sensitive body (1) of which the electric characteristics vary depending upon the application of stress and an insulator (2) having electric insulation are formed being closely adhered together, wherein the stress-sensitive body (1) comprises a thin glass film containing an electrically conductive element that is solidly dissolved therein as atoms, a method of manufacturing the physical quantity sensor device, a piezo-resistive film comprising a thin glass film containing ruthenium that is solidly dissolved therein as atoms, and a method of manufacturing the piezo-resistive film.Type: GrantFiled: May 28, 2010Date of Patent: April 10, 2012Assignee: Denso CorporationInventors: Masashi Totokawa, Masao Naito, Akihiro Takeichi
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Publication number: 20110034031Abstract: A manufacturing method of a semiconductor device includes: irradiating a laser beam on a single crystal silicon substrate, and scanning the laser beam on the substrate so that a portion of the substrate is poly crystallized, wherein at least a part of a poly crystallized portion of the substrate is exposed on a surface of the substrate; and etching the poly crystallized portion of the substrate with an etchant. In this case, a process time is improved.Type: ApplicationFiled: August 5, 2010Publication date: February 10, 2011Applicant: DENSO CORPORATIONInventors: Katsuhiko Kanamori, Masashi Totokawa, Hiroshi Tanaka
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Publication number: 20110034032Abstract: A method of formation of a thermal spray coating which forms a thermal spray coating on a coating-forming surface, characterized by comprising a thermal spraying step of thermally spraying feedstock powder on the coating-forming surface and a deposition and coating forming step of having the thermally sprayed feedstock powder deposit on the coating-forming surface and solidify to form a coating, in the deposition and coating forming step, when deposited on the coating-forming surface by thermal spraying, the feedstock powder deposits in the solid phase state in 50 to 90%, preferably 70 to 80%, of the whole so as to raise the ratio of the crystallite remaining in the feedstock powder and secure a high heat conductivity.Type: ApplicationFiled: June 8, 2010Publication date: February 10, 2011Applicant: DENSO CORPORATIONInventors: Toshiki Itoh, Kouzou Yoshimura, Ryonosuke Tera, Masashi Totokawa, Yasunori Ninomiya
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Publication number: 20100307255Abstract: A physical quantity sensor device (10) having a structure in which a stress-sensitive body (1) of which the electric characteristics vary depending upon the application of stress and an insulator (2) having electric insulation are formed being closely adhered together, wherein the stress-sensitive body (1) comprises a thin glass film containing an electrically conductive element that is solidly dissolved therein as atoms, a method of manufacturing the physical quantity sensor device, a piezo-resistive film comprising a thin glass film containing ruthenium that is solidly dissolved therein as atoms, and a method of manufacturing the piezo-resistive film.Type: ApplicationFiled: May 28, 2010Publication date: December 9, 2010Applicant: DENSO CORPORATIONInventors: Masashi Totokawa, Masao Naito, Akihiro Takeichi
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Publication number: 20100288636Abstract: A laminated gas sensor for exhaust gases improving thermal shock resistance, durability and reliability without permitting characteristics of the exhaust gas sensor to be particularly lowered is provided. A laminated gas sensor comprising a solid electrolyte layer (4) formed on one surface of a substrate (1) holding a lower electrode layer (3) therebetween, and an upper electrode layer (5) on the solid electrolyte layer (4), wherein the substrate (1) is a dense substrate made of at least one substrate material selected from silicon nitride, silicon carbide and aluminum nitride, and, as required, a thermal expansion buffer layer (8) is provided between the substrate (1) inclusive of at least part of the lower electrode layer (3) and the solid electrolyte layer (4), and the difference is not more than 5 ppm/° C.Type: ApplicationFiled: May 12, 2010Publication date: November 18, 2010Applicant: DENSO CORPORATIONInventors: Masahiro Sone, Manabu Tomisaka, Masashi Totokawa
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Patent number: 7807073Abstract: A conductor composition being able to easily secure the conductivity at the same level as an Ag bulk at low temperature process, a mounting substrate utilizing the conductor composition and a mounting structure utilizing the conductor composition are provided. In a mounting structure, wherein one or more electrodes (11) of a mounting substrate (10) and one or more surface mounting components (20) are connected through a conductor composition (30), and one or more surface wirings (14) of the mounting substrate (10), one or more inner-layer wirings (13) and one or more via conductors (12) are formed with the conductor composition, the conductor composition contains conductive particles with electrical conductivity, and the conductive particles are composed of low crystallized Ag fillers with the crystal size of 10 ?m or less.Type: GrantFiled: May 17, 2007Date of Patent: October 5, 2010Assignee: DENSO CORPORATIONInventors: Masashi Totokawa, Yuji Ootani, Hirokazu Imai, Akira Shintai
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Patent number: 7524893Abstract: The present invention provides a conductive adhesive that is applicable as means for forming conductive junction to process for surface mounting of electronic parts for vehicle loading and process for the manufacture of the electronic parts per se for the purpose of substituting soldering therewith. The conductive adhesive according to the present invention is a conductive adhesive produced by dispersing a conductive medium, such as silver powder, in a binder resin component of a one-component epoxy thermosetting resin which has such a composition that the resin comprises, as essential components, an epoxy resin component composed mainly of an epoxy compound with a polycyclic aromatic ring skeleton, and a cyclic acid anhydride as a curing agent component thereof, and is further added with a coupling agent as an adherence imparting agent therefor.Type: GrantFiled: February 9, 2005Date of Patent: April 28, 2009Assignees: Harima Chemicals, Inc., Denso CorporationInventors: Nobuto Terada, Naoto Shioi, Masashi Totokawa, Yasunori Ninomiya
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Publication number: 20090013801Abstract: A physical quantity sensor element includes a strain sensitive resistor and an electrically insulating material. The strain sensitive resistor has an electrical resistance value changeable in response to a change of a strain level generated by application of a stress. The electrically insulating material is bonded to the strain sensitive resistor, the electrically insulating material having an electrically insulating property. The strain sensitive resistor includes (a) a matrix including a glass and (b) electrically conductive particles that are dispersed in the glass. The glass is free of lead and includes bismuth.Type: ApplicationFiled: July 9, 2008Publication date: January 15, 2009Applicants: DENSO CORPORATION, Tanaka Kikinzoku Kogyo K.K.Inventors: Shuichi Yamashita, Masashi Totokawa, Masao Naitou, Tetsuo Imamura, Kenji Morikawa, Takuji Iwano
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Patent number: 7458150Abstract: A method of producing a circuit board includes a step of providing a conductive paste including metal nano-particles at an insulating substrate, and a step of sintering the conductive paste so as to form a circuit conductor. In the sintering step, the conductive paste is sintered in a low-oxygen condition including alcohol such that the metal nano-particles are sintered.Type: GrantFiled: August 14, 2006Date of Patent: December 2, 2008Assignee: Denso CorporationInventors: Masashi Totokawa, Yasunori Ninomiya
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Patent number: 7357883Abstract: A conductive adhesive is formed by mixing a plurality of conductive fillers into a thermosetting resin. The conductive filler includes a core material made of copper-based metal, a coating film made of silver and a plurality of particles made of silver. The coating film is provided on the core material to cover the core material, and the particles are provided on a surface of the coating film. Accordingly, a surface of the core material is prevented from being exposed. The conductive adhesive can be suitably used for bonding two members.Type: GrantFiled: August 8, 2006Date of Patent: April 15, 2008Assignee: DENSO CORPORATIONInventors: Yasunori Ninomiya, Masashi Totokawa, Hirokazu Imai, Yukinori Migitaka
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Patent number: 7276185Abstract: A conductor composition being able to easily secure the conductivity at the same level as an Ag bulk at low temperature process, a mounting substrate utilizing the conductor composition and a mounting structure utilizing the conductor composition are provided. In a mounting structure, wherein one or more electrodes (11) of a mounting substrate (10) and one or more surface mounting components (20) are connected through a conductor composition (30), and one or more surface wirings (14) of the mounting substrate (10), one or more inner-layer wirings (13) and one or more via conductors (12) are formed with the conductor composition, the conductor composition contains conductive particles with electrical conductivity, and the conductive particles are composed of low crystallized Ag fillers with the crystal size of 10 nm or less.Type: GrantFiled: October 21, 2004Date of Patent: October 2, 2007Assignee: DENSO CORPORATIONInventors: Masashi Totokawa, Yuji Ootani, Hirokazu Imai, Akira Shintai
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Publication number: 20070224511Abstract: A conductor composition being able to easily secure the conductivity at the same level as an Ag bulk at low temperature process, a mounting substrate utilizing the conductor composition and a mounting structure utilizing the conductor composition are provided. In a mounting structure, wherein one or more electrodes (11) of a mounting substrate (10) and one or more surface mounting components (20) are connected through a conductor composition (30), and one or more surface wirings (14) of the mounting substrate (10), one or more inner-layer wirings (13) and one or more via conductors (12) are formed with the conductor composition, the conductor composition contains conductive particles with electrical conductivity, and the conductive particles are composed of low crystallized Ag fillers with the crystal size of 10 nm or less.Type: ApplicationFiled: May 17, 2007Publication date: September 27, 2007Applicant: DENSO CORPORATIONInventors: Masashi Totokawa, Yuji Ootani, Hirokazu Imai, Akira Shintai