Patents by Inventor Hirofumi Kuroda
Hirofumi Kuroda 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: 8092612Abstract: A cooling device (70) for cooling a work piece (9) that has reached a high temperature due to the implementation of a closing operation in which a bottom portion (9c) is formed by closing an end portion of the tubular work piece (9) comprises a tilting mechanism (151) which tilts the work piece (9) such that the bottom portion (9c) faces downwards and a cooling water tank (155) storing cooling water. The bottom portion (9c) of the work piece (9) tilted by the tilting mechanism (151) is submerged in cooling water stored in the cooling water tank (155).Type: GrantFiled: March 30, 2006Date of Patent: January 10, 2012Assignee: Kayaba Industry Co., Ltd.Inventors: Keisuke Mishima, Hirofumi Kuroda
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Publication number: 20110265225Abstract: The present invention relates to a transgenic plant having increased seed size prepared via introduction of DNA encoding a protein consisting of a specific amino acid sequence derived from a plant, such as rice, and a method for producing the same.Type: ApplicationFiled: October 16, 2009Publication date: October 27, 2011Applicants: NATIONAL INSTITUTE OF AGROBIOLOGICAL SCIENCES, RIKENInventors: Takeshi Yoshizumi, Minami Matsui, Tomoko Kuriyama, Hirofumi Kuroda, Shinya Takahashi, Hirohiko Hirochika
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Patent number: 7956136Abstract: The object of the invention is to provide a resin composition for semiconductor encapsulation realizing excellent soldering resistance and flame resistance and having excellent flowability and curing properties, and a semiconductor device. The invention has solved the object by a resin composition for semiconductor encapsulation comprising (A) an epoxy resin containing (a) an epoxy resin represented by formula (1), (B) a compound having two or more phenolic hydroxyl groups in its molecule, (C) an inorganic filler, and (D) a curing accelerator: wherein each of R1 and R2 represents a hydrogen atom or a hydrocarbon group with 4 or less carbon atoms and may be the same or different; and ‘n’ represents a mean value that is a positive number of from 0 to 5; in the formula (1).Type: GrantFiled: July 19, 2005Date of Patent: June 7, 2011Assignee: Sumitomo Bakelite Company, Ltd.Inventor: Hirofumi Kuroda
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Publication number: 20110021665Abstract: A resin composition for semiconductor encapsulation realizing excellent soldering resistance and flame resistance and having excellent flowability and curing properties, and a semiconductor device. The resin composition for semiconductor encapsulation includes (A) an epoxy resin containing (a) an epoxy resin represented by formula (1), (B) a compound having two or more phenolic hydroxyl groups in its molecule, (C) an inorganic filler, and (D) a curing accelerator: wherein each of R1 and R2 represents a hydrogen atom or a hydrocarbon group with 4 or less carbon atoms and may be the same or different; and ‘n’ represents a mean value that is a positive number of from 0 to 5; in the formula (1).Type: ApplicationFiled: January 20, 2010Publication date: January 27, 2011Inventor: Hirofumi Kuroda
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Patent number: 7696286Abstract: A resin composition for semiconductor encapsulation contains an epoxy resin (A); a phenolic compound (B) containing two or more phenolic hydroxyl groups; an inorganic filler (C); and a curing accelerator (D). The epoxy resin (A) contains an epoxy resin (a1) represented by the formula (1) wherein Ar is a C6-C20 aryl group, R1 is a C1-C6 hydrocarbon group, R2 is a C1-C4 hydrocarbon group, W1 is oxygen or sulfur, RO is a C1-C6 hydrocarbon group, a=0-10, g=0-3, 0<m<1, 0<n<1, m+n=1 and m:n=1:10 to 1:1, and the resin composition has a moisture absorption rate of 0.22 weight % or less when the composition is humidified at 85° C. and 85% R.H.Type: GrantFiled: March 29, 2007Date of Patent: April 13, 2010Assignee: Sumitomo Bakelite Company, Ltd.Inventors: Masashi Endo, Hirofumi Kuroda
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Publication number: 20100058497Abstract: The present invention provides an early-maturing transgenic plant, which comprises a nucleic acid that encodes a protein having activity of causing early maturation of a plant, so that the gene can be expressed.Type: ApplicationFiled: August 14, 2007Publication date: March 4, 2010Applicant: RIKENInventors: Takanari Ichikawa, Mika Kawashima, Haruko Iizumi, Hirofumi Kuroda, Youichi Kondou, Motoaki Seki, Yukako Hasegawa, Minami Matsui, Akie Ishikawa, Miki Nakazawa, Kumiko Suzuki
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Patent number: 7671146Abstract: This invention provides an epoxy resin composition for encapsulating a semiconductor exhibiting higher flame resistance, good flowability and adequately higher solder-reflow resistance to allow for the use of a lead-free solder without a flame retardant, as well as a highly reliable semiconductor device in which a semiconductor element is encapsulated with a cured product from the composition.Type: GrantFiled: March 5, 2007Date of Patent: March 2, 2010Assignee: Sumitomo Bakelite Company, LtdInventors: Ken Ukawa, Hirofumi Kuroda
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Publication number: 20090211731Abstract: A cooling device (70) for cooling a work piece (9) that has reached a high temperature due to the implementation of a closing operation in which a bottom portion (9c) is formed by closing an end portion of the tubular work piece (9) comprises a tilting mechanism (151) which tilts the work piece (9) such that the bottom portion (9c) faces downwards and a cooling water tank (155) storing cooling water. The bottom portion (9c) of the work piece (9) tilted by the tilting mechanism (151) is submerged in cooling water stored in the cooling water tank (155).Type: ApplicationFiled: March 30, 2006Publication date: August 27, 2009Applicant: Kayaba Industry Co., LtdInventors: Keisuke Mishima, Hirofumi Kuroda
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Publication number: 20090107203Abstract: A press-molding device (80) molds a bottom portion of a work piece (9) having a closed-end shape between an inner die (521) inserted into the work piece (9) and an outer die (551) disposed on an outside of the work piece (9). A chuck position switching mechanism (501) grips the work piece (9) so that the work piece (9) can move in an axial direction. An inner die moving mechanism (522) inserts the inner die (521) into the inside end of the work piece (9). A stopper mechanism (531) supports the inner die (521) in a processing position by restricting movement of the inner die (521). An outer die moving mechanism (552) press-molds the bottom portion of the work piece (9) between the outer die (551) and the inner die (521), thereby press-molding the workpiece (9) smoothly without damaging an inner peripheral surface of the workpiece (9).Type: ApplicationFiled: March 31, 2006Publication date: April 30, 2009Applicant: KAYABA INDUSTRY CO., LTDInventors: Keisuke Mishima, Hirofumi Kuroda
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Patent number: 7470754Abstract: An objective of this invention is to provide an epoxy resin composition for encapsulating a semiconductor free from a harmful substance out of regard for the environment, which exhibits excellent soldering heat resistance and a higher productivity, as well as a semiconductor device manufactured by encapsulating therewith. This invention relates to a epoxy resin composition for encapsulating a semiconductor comprising, as essential components, (A) an epoxy resin having a particular structure and (B) a phenolic resin comprising a phenolic resin component having a particular structure as a main component, which contains a component having up to three aromatic rings in one molecule in 0.8% or less in an area ratio as determined by GPC analysis, as well as a semiconductor device manufactured by encapsulating a semiconductor chip with the composition.Type: GrantFiled: March 8, 2005Date of Patent: December 30, 2008Assignee: Sumitomo Bakelite Co., Ltd.Inventors: Hiroki Nikaido, Hirofumi Kuroda
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Publication number: 20080246008Abstract: A semiconductor-encapsulating resin composition includes a curing agent and a compound (A) having a plurality of glycidyl ether groups. When ion viscosity of the resin composition is measured under conditions of a measurement temperature of about 175° C. and a measurement frequency of about 100 Hz, minimum ion viscosity appears at about 5 seconds or later and within about 40 seconds from a measurement starting point. The minimum ion viscosity is at least about 4.0 and at most about 7.0. A maximum slope of the ion viscosity appears at about 10 seconds or later and within about 60 seconds from the measurement starting point. The maximum slope is at least about 2.0 and at most about 6.0.Type: ApplicationFiled: March 21, 2008Publication date: October 9, 2008Applicant: SUMITOMO BAKELITE CO., LTD.Inventor: Hirofumi Kuroda
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Patent number: 7431990Abstract: An objective of this invention is to provide an epoxy resin composition for encapsulating a semiconductor chip, which is excellent in flowability and moldability without deterioration in crack resistance during soldering and flame retardance. Specifically, this invention provides a resin composition for encapsulating a semiconductor chip comprises an epoxy resin (A) containing the specific structure; a phenolic resin (B) containing the specific structure; an inorganic filler (C); a curing accelerator (D); a silane coupling agent (E); and Compound (F) containing an aromatic ring in which at least two adjacent carbon atoms of the ring member carbon atoms are coupled to a hydroxyl group, respectively.Type: GrantFiled: May 25, 2005Date of Patent: October 7, 2008Assignee: Sumitomo Bakelite CoInventor: Hirofumi Kuroda
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Publication number: 20080097010Abstract: The object of the invention is to provide a resin composition for semiconductor encapsulation realizing excellent soldering resistance and flame resistance and having excellent flowability and curing properties, and a semiconductor device. The invention has solved the object by a resin composition for semiconductor encapsulation comprising (A) an epoxy resin containing (a) an epoxy resin represented by formula (1), (B) a compound having two or more phenolic hydroxyl groups in its molecule, (C) an inorganic filler, and (D) a curing accelerator: wherein each of R1 and R2 represents a hydrogen atom or a hydrocarbon group with 4 or less carbon atoms and may be the same or different; and ‘n’ represents a mean value that is a positive number of from 0 to 5; in the formula (1).Type: ApplicationFiled: July 19, 2005Publication date: April 24, 2008Inventor: Hirofumi Kuroda
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Publication number: 20070232728Abstract: An object of the present invention is to provide an epoxy resin composition for semiconductor encapsulation which exhibit high flame resistance, and high soldering resistance after humidified, and has an advantage of low material and production costs. A resin composition for semiconductor encapsulation contains an epoxy resin (A); a phenolic compound (B) containing two or more phenolic hydroxyl groups; an inorganic filler (C); and a curing accelerator (D). The epoxy resin (A) contains an epoxy resin (a1) represented by the formula (1), and the resin composition has a moisture absorption rate of 0.22 weight % or less when the composition is humidified at 85° C. and 85% R.H.Type: ApplicationFiled: March 29, 2007Publication date: October 4, 2007Inventors: Masashi Endo, Hirofumi Kuroda
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Publication number: 20070213477Abstract: This invention provides an epoxy resin composition for encapsulating a semiconductor exhibiting higher flame resistance, good flowability and adequately higher solder-reflow resistance to allow for the use of a lead-free solder without a flame retardant, as well as a highly reliable semiconductor device in which a semiconductor element is encapsulated with a cured product from the composition.Type: ApplicationFiled: March 5, 2007Publication date: September 13, 2007Inventors: Ken Ukawa, Hirofumi Kuroda
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Patent number: 7157313Abstract: The present invention provides an epoxy resin composition for packaging a semiconductor device, characterized in having improved mold releasability during a molding process, continuous-moldability and improved solder resistance. According to the present invention, there is provided an epoxy resin composition for packaging the semiconductor element, obtained by formulating: (A) an epoxy resin; (B) a phenolic resin; (C) a curing accelerator; (D) an inorganic filler; and (E) an oxidized polyethylene wax having a drop point within a range of from 60 to 140 degree C., an acid value within a range of from 10 to 100 (mg KOH/g), a number average molecular weight within a range of from 500 to 20,000, and a mean particle size within a range of from 5 to 100 ?m, wherein at least one of (A) epoxy resin and (B) phenolic resin is a novolac structured resin having biphenylene structure, and wherein content of (E) oxidized polyethylene wax in epoxy resin composition is within a range of from 0.01 to 1 % wt.Type: GrantFiled: January 15, 2004Date of Patent: January 2, 2007Assignee: Sumitomo Bakelite Co., Ltd.Inventor: Hirofumi Kuroda
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Publication number: 20050267237Abstract: An objective of this invention is to provide an epoxy resin composition for encapsulating a semiconductor chip, which is excellent in flowability and moldability without deterioration in crack resistance during soldering and flame retardance. Specifically, this invention provides a resin composition for encapsulating a semiconductor chip comprises an epoxy resin (A) containing the specific structure; a phenolic resin (B) containing the specific structure; an inorganic filler (C); a curing accelerator (D); a silane coupling agent (E); and Compound (F) containing an aromatic ring in which at least two adjacent carbon atoms of the ring member carbon atoms are coupled to a hydroxyl group, respectively.Type: ApplicationFiled: May 25, 2005Publication date: December 1, 2005Inventor: Hirofumi Kuroda
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Publication number: 20050208307Abstract: An objective of this invention is to provide an epoxy resin composition for encapsulating a semiconductor free from a harmful substance out of regard for the environment, which exhibits excellent soldering heat resistance and a higher productivity, as well as a semiconductor device manufactured by encapsulating therewith. This invention relates to a epoxy resin composition for encapsulating a semiconductor comprising, as essential components, (A) an epoxy resin having a particular structure and (B) a phenolic resin comprising a phenolic resin component having a particular structure as a main component, which contains a component having up to three aromatic rings in one molecule in 0.8% or less in an area ratio as determined by GPC analysis, as well as a semiconductor device manufactured by encapsulating a semiconductor chip with the composition.Type: ApplicationFiled: March 8, 2005Publication date: September 22, 2005Inventors: Hiroki Nikaido, Hirofumi Kuroda
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Publication number: 20040232532Abstract: The present invention provides an epoxy resin composition for packaging a semiconductor device, characterized in having improved mold releasability during a molding process, continuous-moldability and improved solder resistance. According to the present invention, there is provided an epoxy resin composition for packaging the semiconductor element, obtained by formulating: (A) an epoxy resin; (B) a phenolic resin; (C) a curing accelerator; (D) an inorganic filler; and (E) an oxidized polyethylene wax having a drop point within a range of from 60 to 140 degree C., an acid value within a range of from 10 to 100 (mg KOH/g), a number average molecular weight within a range of from 500 to 20,000, and a mean particle size within a range of from 5 to 100 &mgr;m, wherein at least one of (A) epoxy resin and (B) phenolic resin is a novolac structured resin having biphenylene structure, and wherein content of (E) oxidized polyethylene wax in epoxy resin composition is within a range of from 0.01 to 1 % wt.Type: ApplicationFiled: January 15, 2004Publication date: November 25, 2004Inventor: Hirofumi Kuroda
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Patent number: 6313303Abstract: Processes for preparing sulfoxides useful as drugs such as acid secretion inhibitors or antiulcer drugs or intermediates for the preparation of drugs in high yields, at high purities, and with safety. Specifically, a process for the preparation of sulfoxides (II) by oxidizing a thio ether (I) with a peroxoborate salt in the presence of an acid anhydride or a metal catalyst; and a process for the preparation of sulfoxides (II) by oxidizing a thio ether (I) with an N-halosuccinimide, 1,3-dihalo-5,5-dimethyl-hydantoin or dichloroisocyanuric acid salt in the presence of a base.Type: GrantFiled: January 3, 2000Date of Patent: November 6, 2001Assignee: Eisai Co., Ltd.Inventors: Katsuya Tagami, Nobuo Niikawa, Akio Kayano, Hirofumi Kuroda