Patents by Inventor Tatsuyuki Ishikawa
Tatsuyuki Ishikawa 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: 20120053257Abstract: The present invention relates to a process for producing a polycarbonate resin extruded foam including a process of kneading, together with a blowing agent, and a mixture in which 5 to 100 parts by weight of a polyester copolymer, this resin including diol component units which contain therein glycol component units having a cyclic ether structure in an amount of 25 to 50% by mole of the diol component units and dicarboxylic acid component units, are blended into 100 parts by weight of a polycarbonate resin, thereby preparing a foamable melted resin, and then extruding and foaming the foamable melted resin. The polycarbonate resin extruded foam of the invention is high in mechanical strengths, small in thermal conductivity, and very good in thermal insulation properties over a long term, and can be preferably used for architecture articles such as light structural material or a heat insulating material.Type: ApplicationFiled: August 26, 2011Publication date: March 1, 2012Applicant: JSP CORPORATIONInventors: Tatsuyuki ISHIKAWA, Akira OKUDA, Naochika KOGURE
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Patent number: 8078940Abstract: A non-volatile semiconductor memory device comprises a memory cell array including a plurality of memory cells arrayed capable of storing information in accordance with variations in threshold voltage. A likelihood calculator has a plurality of likelihood calculation algorithms for deriving a likelihood value about a stored data bit from a threshold value read out of the memory cell. An error correction unit executes error correction through iterative processing using the likelihood value obtained at the likelihood calculator. A likelihood calculator controller changes among the likelihood calculation algorithms in the likelihood calculator based on a certain value of the number of iterations in the iterative processing obtained from the error correction unit.Type: GrantFiled: October 23, 2007Date of Patent: December 13, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Hironori Uchikawa, Tatsuyuki Ishikawa, Mitsuaki Honma
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Publication number: 20110250421Abstract: The present invention relates to an extruded thermoplastic resin foam, particularly relates to a board extruded thermoplastic resin which has low heat conductivity, an excellent heat insulating property over a long period of time, high flame retardancy, and excellent mechanical strength. The extruded thermoplastic resin foam having an apparent density of 20 to 50 kg/m3, a closed cells ratio of 85% or more and a thickness of 10 to 150 mm, and containing a non-halogen organic physical blowing agent, wherein the thermoplastic resin composing the extruded foam contains a mixture of 100 parts by weight of a polystyrene resin (A) and 5 to 150 parts by weight of a polyester resin (B), and an endothermic calorific value of the polyester resin (B) less than 5 J/g (including 0) for fusion of the polyester resin on a DSC curve obtained by heat flux differential scanning calorimetry based on JIS K7122 (1987).Type: ApplicationFiled: April 6, 2011Publication date: October 13, 2011Applicant: JSP CORPORATIONInventors: Akira OKUDA, Tatsuyuki ISHIKAWA, Naochika KOGURE, Kazunobu SATO
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Patent number: 8032810Abstract: This memory device comprises a word-line control circuit applying a read voltage and a soft-value read voltage as a word line voltage to a word line to generate soft-values. The soft-value read voltage is between an upper limit and a lower limit of each of plural threshold voltage distributions. A likelihood calculation circuit calculates a likelihood value of data stored in a memory cell based on the soft-value. An error correction circuit executes data error correction for the data read from the memory cell based on the likelihood value. A refresh control circuit controls a timing of a refresh operation for the memory cell based on the soft-value or the likelihood value.Type: GrantFiled: August 15, 2007Date of Patent: October 4, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Tatsuyuki Ishikawa, Mitsuaki Honma, Hironori Uchikawa
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Publication number: 20110239080Abstract: An LDPC error detection/correction circuit according to an embodiment includes a selector that divides data into p groups based on a check matrix H including blocks made up of unit matrixes having a size p and shift blocks, a selector that divides a group into Y subgroups, a bit node storage section that stores LMEM variables to calculate a probability ? in association with each first address, a check node storage section that stores TMEM variables to calculate an external value ? in association with each second address, a rotator that performs rotation processing on the TMEM with a rotation value based on a shift value, and an operation circuit made up of (p/Y) operation units that perform parallel processing in subgroup units.Type: ApplicationFiled: March 3, 2011Publication date: September 29, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Kenji SAKAUE, Tatsuyuki ISHIKAWA, Yukio ISHIKAWA, Kazuhiro ICHIKAWA, Hironori UCHIKAWA
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Publication number: 20110072331Abstract: A memory system having a memory card configured to store frame data composed of a plurality of pieces of sector data and a host configured to send and receive the frame data to and from the memory card, the memory card includes: an ECC1 decoder configured to perform BCH decoding processing with a hard decision code on a sector data basis; an ECC2 decoder configured to perform LDPC decoding processing with an LDPC code on a frame data basis; a sector error flag section configured to store information about presence or absence of error data in the BCH decoding processing; and an ECC control section configured to perform, in the LDPC decoding processing, control of increasing a reliability of sector data containing no error data based on the information in the sector error flag section.Type: ApplicationFiled: June 1, 2010Publication date: March 24, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kenji SAKAUE, Tatsuyuki ISHIKAWA, Kazuhiro ICHIKAWA
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Publication number: 20080301532Abstract: A non-volatile semiconductor memory device comprises a memory cell array including a plurality of memory cells arrayed capable of storing information of N bits (N?2) in accordance with variations in threshold voltage. A parity data adder circuit adds parity data for error correction to every certain data bits to be stored in the memory cell array. A frame converter circuit uniformly divides frame data containing the data bits and the parity data into N pieces of subframe data. A programming circuit stores the subframe data divided into N pieces in respective N sub-pages formed corresponding to the information of N bits.Type: ApplicationFiled: September 24, 2007Publication date: December 4, 2008Applicant: Kabushiki Kaisha ToshibaInventors: Hironori UCHIKAWA, Tatsuyuki Ishikawa, Mitsuaki Honma
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Publication number: 20080104459Abstract: A non-volatile semiconductor memory device comprises a memory cell array including a plurality of memory cells arrayed capable of storing information in accordance with variations in threshold voltage. A likelihood calculator has a plurality of likelihood calculation algorithms for deriving a likelihood value about a stored data bit from a threshold value read out of the memory cell. An error correction unit executes error correction through iterative processing using the likelihood value obtained at the likelihood calculator. A likelihood calculator controller changes among the likelihood calculation algorithms in the likelihood calculator based on a certain value of the number of iterations in the iterative processing obtained from the error correction unit.Type: ApplicationFiled: October 23, 2007Publication date: May 1, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hironori Uchikawa, Tatsuyuki Ishikawa, Mitsuaki Honma
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Publication number: 20080055990Abstract: This memory device comprises a word-line control circuit applying a read voltage and a soft-value read voltage as a word line voltage to a word line to generate soft-values. The soft-value read voltage is between an upper limit and a lower limit of each of plural threshold voltage distributions. A likelihood calculation circuit calculates a likelihood value of data stored in a memory cell based on the soft-value. An error correction circuit executes data error correction for the data read from the memory cell based on the likelihood value. A refresh control circuit controls a timing of a refresh operation for the memory cell based on the soft-value or the likelihood value.Type: ApplicationFiled: August 15, 2007Publication date: March 6, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tatsuyuki Ishikawa, Mitsuaki Honma, Hironori Uchikawa
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Patent number: 7052626Abstract: A fluid composition for a refrigerator, which comprises a chlorine-free fluorocarbon refrigerant and a refrigerator oil, said refrigerator oil consisting essentially of a tetraester of pentaerythritol of formula (1) with both 2-ethylhexanoic acid and 3,5,5-trimethylhexanoic acid, said refrigerator oil exhibiting a pour point not higher than ?10° C.Type: GrantFiled: April 9, 1998Date of Patent: May 30, 2006Assignee: Nippon Mitsubishi Oil CorporationInventors: Hiroshi Hasegawa, Noboru Ishida, Umekichi Sasaki, Tatsuyuki Ishikawa
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Patent number: 6998065Abstract: A refrigerator oil for use in compressors using therein a hydrogen-containing halogenocarbon as a refrigerant, consisting essentially of as a base oil at least one kind of an ester selected from the group consisting of a specific pentaerythritol ester such as an ester of pentaerythritol with a mono- or dicarboxylic acid, a specific polyol ester such as an ester of trimethylolethane with a mono- or dicarboxylic acid, a specific ester such as an ester of ethylene glycol and a dicarboxylic acid, and a specific polyol ester synthesized from a neopentyl type polyhydric alcohol, a monocarboxylic acid and a dicarboxylic acid; and further comprising at least one kind of an epoxy compound.Type: GrantFiled: September 14, 1998Date of Patent: February 14, 2006Assignee: Nippon Mitsubishi Oil CorporationInventors: Hiroshi Hasegawa, Noboru Ishida, Umekichi Sasaki, Tatsuyuki Ishikawa
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Patent number: 6582621Abstract: A refrigerator oil for use in compressors using therein a hydrogen-containing halogenocarbon as a refrigerant, consisting essentially of as a base oil at least one kind of an ester selected from the group consisting of a specific pentaerythritol ester such as an ester of pentaerythritol with a mono- or dicarboxylic acid, a specific polyol ester such as an ester of trimethylolethane with a mono- or dicarboxylic acid, a specific ester such as an ester of ethylene glycol and a dicarboxylic acid, and a specific polyol ester synthesized from a neopentyl type polyhydric alcohol, a monocarboxylic acid and a dicarboxylic acid; and further comprising at least one kind of an epoxy compound.Type: GrantFiled: October 4, 1995Date of Patent: June 24, 2003Assignee: Nippon Mitsubishi Oil CorporationInventors: Umekichi Sasaki, Tatsuyuki Ishikawa, Hiroshi Hasegawa, Noboru Ishida
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Patent number: 6153118Abstract: A refrigerator oil for use in compressors using therein a hydrogen-containing halogenocarbon as a refrigerant, consisting essentially of as a base oil at least two esters selected from the group consisting of a specific pentaerythritol ester such as an ester of pentaerythritol with a mono- or dicarboxylic acid, a specific polyol ester such as an ester of trimethylolethane with a mono- or dicarboxylic acid, a specific ester such as an ester of ethylene glycol and a dicarboxylic acid, and a specific polyol ester synthesized from a neopentyl type polyhydric alcohol, a monocarboxylic acid and a dicarboxylic acid; and further comprising at least one kind of an epoxy compound.Type: GrantFiled: November 6, 1998Date of Patent: November 28, 2000Assignee: Nippon Mitsubishi Oil Corp.Inventors: Hiroshi Hasegawa, Noboru Ishida, Umekichi Sasaki, Tatsuyuki Ishikawa
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Patent number: 5447647Abstract: A refrigerator oil mainly comprises, as a base oil, an ester of a carboxylic acid having a specific structure represented by the formula ##STR1## and at least one kind of an epoxy compound, which refrigerator oil is excellent in electrical insulating properties, stability to hydrolysis, wear resistance, non-hydroscopicity, compatibility with a hydrogen-containing halogeno carbon refrigerant, and thrmal stability and chemical stability.Type: GrantFiled: March 1, 1994Date of Patent: September 5, 1995Assignee: Nippon Oil Co., Ltd.Inventors: Noboru Ishida, Motoshi Sunami, Umekichi Sasaki, Tatsuyuki Ishikawa, Hiroshi Hasegawa
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Patent number: 5391311Abstract: A fluid composition for refrigerators, which comprises [A] a halogenocarbon refrigerant, and [B] a synthetic lubricating oil comprising at least one carbonic acid ester selected from the group consisting of:[I] a carbonic acid ester represented by the general formula (1) ##STR1## wherein R.sup.1 and R.sup.2 are each an alkyl or dihydric alcohol residue, R.sup.3 is an alkylene, and a is 1-30,[II] a carbonic acid ester represented by the general formula (2) ##STR2## wherein X.sup.1 is --H or ##STR3## R.sup.4 -R.sup.6 are each an alkyl, cycloalkyl or neopentyl type polyol residue, R.sup.7 is an alkyl, b is 1 or 2, c is 0 or 1 (b+c=2), d is 0-30 and e is 1-3, and[III] a carbonic acid ester of which alcohol moieties are (i) a monohydric alcohol, (ii) a dihydric alcohol, and (iii) a neopentyl type polyol or dimer or trimer thereof.Type: GrantFiled: October 7, 1993Date of Patent: February 21, 1995Assignee: Nippon Oil Co., Ltd.Inventors: Noboru Ishida, Hiroshi Hasegawa, Umekichi Sasaki, Tatsuyuki Ishikawa
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Patent number: 5262076Abstract: A synthetic lubricating oil comprising as a base oil at least one kind of a carbonic acid ester selected from the group consisting of:[I] a carbonic acid ester represented by the general formula (1) ##STR1## wherein R.sup.1 and R.sup.2 are each an alkyl or dihydric alcohol residue, R.sup.3 is an alkylene, and a is 0-30,[II] a carbonic acid ester represented by the general formula (2) ##STR2## wherein X.sup.1 is --H or ##STR3## R.sup.4 -R.sup.6 are each an alkyl, cycloalkyl or neopentyl type polyol residue, R.sup.7 is an alkyl, b is 1 or 2, c is 0 or 1 (b+c=2), d is 0-30, and e is 1-3, and[III] a carbonic acid ester of which alcohol moieties are (A) a monohydric alcohol, (B) a dihydric alcohol, and (C) a neopentyl type polyol or dimer or trimer thereof.Type: GrantFiled: April 15, 1991Date of Patent: November 16, 1993Assignee: Nippon Oil Co., Ltd.Inventors: Noboru Ishida, Hiroshi Hasegawa, Umekichi Sasaki, Tatsuyuki Ishikawa