Patents by Inventor Yasushi Nishikawa
Yasushi Nishikawa 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: 9845267Abstract: Provided is a long and large-area graphite film having improved thermal diffusivity and flex resistance, and accompanied by ameliorated ruffling. According to a method for producing a graphite film, in which graphitization of a heat-treated film consisting of a carbonized polymer film is carried out in a state being wrapped around an internal core, the method being characterized in that a heat treatment is executed by controlling distance(s) between the internal core and the film, and/or between the layers of the film, a graphite film accompanied by significantly ameliorated ruffling can be obtained.Type: GrantFiled: January 13, 2016Date of Patent: December 19, 2017Assignee: KANEKA CORPORATIONInventors: Yusuke Ohta, Makoto Mishiro, Takashi Inada, Yasushi Nishikawa
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Publication number: 20170346069Abstract: A film includes a film body including graphite, and at least one fragment including graphite and formed on one or more surfaces of the film body. The film has a water contact angle of 50 degrees or greater and a glossiness of 20 or lower.Type: ApplicationFiled: August 18, 2017Publication date: November 30, 2017Applicant: KANEKA CORPORATIONInventors: Masahiro Kojima, Satoshi Oku, Makoto Kutsumizu, Yasushi Nishikawa
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Patent number: 9776927Abstract: Provided is a long and large-area graphite film having improved thermal diffusivity and flex resistance, and accompanied by ameliorated ruffling. According to a method for producing a graphite film, in which graphitization of a heat-treated film consisting of a carbonized polymer film is carried out in a state being wrapped around an internal core, the method being characterized in that a heat treatment is executed by controlling distance(s) between the internal core and the film, and/or between the layers of the film, a graphite film accompanied by significantly ameliorated ruffling can be obtained.Type: GrantFiled: January 13, 2016Date of Patent: October 3, 2017Assignee: KANEKA CORPORATIONInventors: Yusuke Ohta, Makoto Mishiro, Takashi Inada, Yasushi Nishikawa
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Patent number: 9745196Abstract: In order to obtain a graphite film having an excellent thermal diffusivity, a high density, and excellent flatness without flaws, recesses and wrinkles on the surface, the process for producing a graphite film according to the present invention comprises the graphitization step for a raw material film made of a polymer film and/or a carbonized polymer film and/or the post-planar pressurization step for the film in this order to prepare a graphite film, wherein the graphitization step is a step of thermally treating two or more stacked raw material films at a highest temperature of 2,000° C. and includes a method of electrically heating the raw material films themselves and/or a method of thermally treating the films while applying pressure to the films planarly, and the post-planar pressurization step includes a method of planarly pressurizing the one raw material film or the multiple stacked raw material films after graphitization by single-plate press or vacuum press.Type: GrantFiled: November 1, 2016Date of Patent: August 29, 2017Assignee: KANEKA CORPORATIONInventors: Yasushi Nishikawa, Shuhei Wakahara, Mutsuaki Murakami
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Patent number: 9682542Abstract: A graphite film showing an extremely low average tearing force is more likely to suffer from various kinds of defects, such as splitting, winding deviation, wrinkling, and poor dimensional accuracy, in a step of producing the graphite film and in a step of processing the graphite film. However, these defects can be prevented by using a graphite film that satisfies the following requirements: 1) having an average tearing force of not more than 0.08 N as determined by Trouser tear method in accordance with JIS K7128; and 2) having sag of not less than 5 mm and not greater than 80 mm as determined by a method of film windability evaluation in accordance with JIS C2151.Type: GrantFiled: December 16, 2015Date of Patent: June 20, 2017Assignee: KANEKA CORPORATIONInventors: Yusuke Ohta, Takashi Inada, Makoto Mishiro, Yasushi Nishikawa, Takashi Inada
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Patent number: 9637386Abstract: A graphite film which is low in graphite dust generation can be produced by properly selecting acid dianhydride and diamine which constitute a polyimide film, which polyimide film is a raw material of the graphite film. Specifically, the graphite film which is low in graphite dust generation can be obtained if (1) the acid dianhydride is PMDA and the diamine has a molar ratio of ODA/PDA in a range of 100:0 to 80:20, or (2) the acid dianhydride has a molar ratio of PMDA/BPDA in a range of 80:20 to 50:50, and the diamine has a molar ratio of ODA/PDA in a range of 30:70 to 90:10.Type: GrantFiled: November 28, 2016Date of Patent: May 2, 2017Assignee: KANEKA CORPORATIONInventors: Yusuke Ohta, Takashi Inada, Makoto Mishiro, Yasushi Nishikawa
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Publication number: 20170106641Abstract: A graphite film showing an extremely low average tearing force is more likely to suffer from various kinds of defects, such as splitting, winding deviation, wrinkling, and poor dimensional accuracy, in a step of producing the graphite film and in a step of processing the graphite film. However, these defects can be prevented by using a graphite film that satisfies the following requirements: 1) having an average tearing force of not more than 0.08 N as determined by Trouser tear method in accordance with JIS K7128; and 2) having sag of not less than 5 mm and not greater than 80 mm as determined by a method of film windability evaluation in accordance with JIS C2151.Type: ApplicationFiled: December 16, 2015Publication date: April 20, 2017Inventors: Yusuke Ohta, Takashi lnada, Makoto Mishiro, Yasushi Nishikawa, Takashi lnada
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Publication number: 20170073231Abstract: A graphite film which is low in graphite dust generation can be produced by properly selecting acid dianhydride and diamine which constitute a polyimide film, which polyimide film is a raw material of the graphite film. Specifically, the graphite film which is low in graphite dust generation can be obtained if (1) the acid dianhydride is PMDA and the diamine has a molar ratio of ODA/PDA in a range of 100:0 to 80:20, or (2) the acid dianhydride has a molar ratio of PMDA/BPDA in a range of 80:20 to 50:50, and the diamine has a molar ratio of ODA/PDA in a range of 30:70 to 90:10.Type: ApplicationFiled: November 28, 2016Publication date: March 16, 2017Inventors: Yusuke Ohta, Takashi lnada, Makoto Mishiro, Yasushi Nishikawa
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Publication number: 20170053851Abstract: Use of highly oriented graphite including graphite layers placed on top of one another and containing only a small amount of water allows for production of an electronic device that includes, as an element, highly oriented graphite in which no delamination occurs, that is highly reliable in use, and that has a good heat dissipation capability.Type: ApplicationFiled: January 15, 2015Publication date: February 23, 2017Applicant: KANEKA CORPORATIONInventors: Makoto KUTSUMIZU, Yusuke KATO, Yasushi NISHIKAWA, Yusuke OHTA
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Publication number: 20170050852Abstract: It is possible to obtain a graphite film with its shape controlled, by performing a sag controlling step of controlling temperatures of a polymer film at both widthwise ends and a temperature of the polymer film in a widthwise middle portion within a temperature range from a starting temperature of thermal decomposition of the polymer film to a sag controlling temperature of the polymer film.Type: ApplicationFiled: November 8, 2016Publication date: February 23, 2017Applicant: KANEKA CORPORATIONInventors: Yusuke OHTA, Takashi INADA, Makoto KUTSUMIZU, Yasushi NISHIKAWA, Satoshi KATAYAMA
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Publication number: 20170044017Abstract: In order to obtain a graphite film having an excellent thermal diffusivity, a high density, and excellent flatness without flaws, recesses and wrinkles on the surface, the process for producing a graphite film according to the present invention comprises the graphitization step for a raw material film made of a polymer film and/or a carbonized polymer film and/or the post-planar pressurization step for the film in this order to prepare a graphite film, wherein the graphitization step is a step of thermally treating two or more stacked raw material films at a highest temperature of 2,000° C. and includes a method of electrically heating the raw material films themselves and/or a method of thermally treating the films while applying pressure to the films planarly, and the post-planar pressurization step includes a method of planarly pressurizing the one raw material film or the multiple stacked raw material films after graphitization by single-plate press or vacuum press.Type: ApplicationFiled: November 1, 2016Publication date: February 16, 2017Applicant: KANEKA CORPORATIONInventors: Yasushi NISHIKAWA, Shuhei WAKAHARA, Mutsuaki MURAKAMI
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Patent number: 9540285Abstract: A graphite film which is low in graphite dust generation can be produced by properly selecting acid dianhydride and diamine which constitute a polyimide film, which polyimide film is a raw material of the graphite film. Specifically, the graphite film which is low in graphite dust generation can be obtained if (1) the acid dianhydride is PMDA and the diamine has a molar ratio of ODA/PDA in a range of 100:0 to 80:20, or (2) the acid dianhydride has a molar ratio of PMDA/BPDA in a range of 80:20 to 50:50, and the diamine has a molar ratio of ODA/PDA in a range of 30:70 to 90:10.Type: GrantFiled: August 19, 2011Date of Patent: January 10, 2017Assignee: KANEKA CORPORATIONInventors: Yusuke Ohta, Takashi Inada, Makoto Mishiro, Yasushi Nishikawa
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Publication number: 20170001867Abstract: Provided is a method of producing a graphite film having a high thermal diffusivity, the method including heat-treating, at a temperature of not lower than 2,400° C., a polyimide film or a carbonized film obtained by carbonizing the polyimide film, the polyimide film (i) having a thickness of not less than 34 ?m and not more than 42 ?m and a birefringence of not less than 0.1000 and (ii) being obtained with use of (a) an acid dianhydride component containing not less than 70 mol % of PMDA and (b) a diamine component containing not less than 70 mol % of ODA.Type: ApplicationFiled: November 28, 2014Publication date: January 5, 2017Applicant: KANEKA CORPORATIONInventors: Motoaki KOBAYASHI, Yasushi NISHIKAWA, Takashi INADA, Yusuke OHTA, Satoshi KATAYAMA, Makoto KUTSUMIZU
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Patent number: 9533888Abstract: It is possible to obtain a graphite film with its shape controlled, by performing a sag controlling step of controlling temperatures of a polymer film at both widthwise ends and a temperature of the polymer film in a widthwise middle portion within a temperature range from a starting temperature of thermal decomposition of the polymer film to a sag controlling temperature of the polymer film.Type: GrantFiled: August 17, 2012Date of Patent: January 3, 2017Assignee: KANEKA CORPORATIONInventors: Yusuke Ohta, Takashi Inada, Makoto Kutsumizu, Yasushi Nishikawa, Satoshi Katayama
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Patent number: 9512005Abstract: In a method for producing a carbonaceous film in which a polymer film is wrapped around a core and is subjected to a heat treatment, material film surfaces during the carbonization step are prevented from fusion, whereby a long carbonaceous having a large area film is obtained. Fusion can be prevented by subjecting a polymer film to a heat treatment under a reduced pressure, and under a reduced pressure while allowing an inert gas to flow. The range of the pressure reduction is preferably ?0.08 MPa to ?0.01 kPa. It is preferred to carry out carbonization with the pressure reduced in the range of from ?0.08 MPa to ?0.01 kPa while allowing an inert gas to flow.Type: GrantFiled: September 5, 2014Date of Patent: December 6, 2016Assignee: KANEKA CORPORATIONInventors: Takashi Inada, Yasushi Nishikawa, Makoto Mishiro
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Patent number: 9512007Abstract: In order to obtain a graphite film having an excellent thermal diffusivity, a high density, and excellent flatness without flaws, recesses and wrinkles on the surface, the process for producing a graphite film according to the present invention comprises the graphitization step for a raw material film made of a polymer film and/or a carbonized polymer film and/or the post-planar pressurization step for the film in this order to prepare a graphite film, wherein the graphitization step is a step of thermally treating two or more stacked raw material films at a highest temperature of 2,000° C. and includes a method of electrically heating the raw material films themselves and/or a method of thermally treating the films while applying pressure to the films planarly, and the post-planar pressurization step includes a method of planarly pressurizing the one raw material film or the multiple stacked raw material films after graphitization by single-plate press or vacuum press.Type: GrantFiled: May 12, 2014Date of Patent: December 6, 2016Assignee: KANEKA CORPORATIONInventors: Yasushi Nishikawa, Shuhei Wakahara, Mutsuaki Murakami
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Patent number: 9500418Abstract: There is provided a graphite composite film including a graphite film and a metal layer formed on a surface of the graphite film, in which peeling-off of the metal layer from the graphite film is suppressed. More specifically, the graphite composite film includes a graphite film and a metal layer formed on at least one side of the graphite film, wherein the graphite film has a plurality of through holes formed therein, a metal layer is formed also inside the through holes so as to be connected to the metal layer formed on a surface of the graphite film, the metal layer inside the through holes is formed continuously from the one side to an opposite side of the graphite film, and a distance between outer diameters of the through holes is 0.6 mm or less and a ratio of an area of metal inside the through holes to an area of the graphite composite film is 1.4% or more.Type: GrantFiled: January 11, 2013Date of Patent: November 22, 2016Assignee: KANEKA CORPORATIONInventors: Makoto Kutsumizu, Yasushi Nishikawa, Yusuke Ohta, Satoshi Katayama, Takashi Inada, Takashi Inada
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Patent number: 9453155Abstract: An object of the present invention is to provide a graphite film, and a graphite composite film both having an excellent thermal diffusivity which can sufficiently manage heat dissipation of electronic instruments, precision instruments and the like, along with an excellent flex resistance which can withstand application to bent portions. Means for Resolution of the present invention is a graphite film exhibiting the number of reciprocal foldings being 10,000 times or more as measured using a rectangular strip test piece having a width of 15 mm until the test piece breaks in a MIT folding endurance test under conditions of: a curvature radius R of the bending clamp being 2 mm; a left-and-right bending angle being 135°; a bending rate being 90 times/min; and a load being 0.98 N.Type: GrantFiled: March 12, 2013Date of Patent: September 27, 2016Assignee: Kaneka CorporationInventors: Yusuke Ohta, Shuhei Wakahara, Yasushi Nishikawa
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Publication number: 20160194250Abstract: Provided is a long and large-area graphite film having improved thermal diffusivity and flex resistance, and accompanied by ameliorated ruffling. According to a method for producing a graphite film, in which graphitization of a heat-treated film consisting of a carbonized polymer film is carried out in a state being wrapped around an internal core, the method being characterized in that a heat treatment is executed by controlling distance(s) between the internal core and the film, and/or between the layers of the film, a graphite film accompanied by significantly ameliorated ruffling can be obtained.Type: ApplicationFiled: January 13, 2016Publication date: July 7, 2016Inventors: Yusuke Ohta, Makoto Mishiro, Takashi lnada, Yasushi Nishikawa
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Publication number: 20160194204Abstract: Provided is a long and large-area graphite film having improved thermal diffusivity and flex resistance, and accompanied by ameliorated ruffling. According to a method for producing a graphite film, in which graphitization of a heat-treated film consisting of a carbonized polymer film is carried out in a state being wrapped around an internal core, the method being characterized in that a heat treatment is executed by controlling distance(s) between the internal core and the film, and/or between the layers of the film, a graphite film accompanied by significantly ameliorated ruffling can be obtained.Type: ApplicationFiled: January 13, 2016Publication date: July 7, 2016Inventors: Yusuke Ohta, Makoto Mishiro, Takashi lnada, Yasushi Nishikawa