Patents by Inventor Eiichi Kitazono
Eiichi Kitazono 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: 8378091Abstract: A cellulose derivative which has a suitable elastic modulus and viscosity when it is dissolved in water and is useful as an adhesion barrier. The cellulose derivative has a molecular weight of 5×103 to 5×106 and is composed of a repeating unit represented by the following formula (1): wherein R1, R2 and R3 are each independently selected from the group consisting of the following formulas (a), (b), (c) and (d) in predetermined amount: (X in the formula (c) is an alkali metal, and R4 and R5 in the formula (d) are each independently an alkyl group or alkenyl group having 10 to 28 carbon atoms).Type: GrantFiled: August 3, 2006Date of Patent: February 19, 2013Assignee: Teijin LimitedInventors: Hiroaki Kaneko, Eiichi Kitazono, Masaya Ito, Yoshihiko Sumi
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Patent number: 8268953Abstract: A process for the preparation of a polycarbonate containing a plant-derived component excellent in hue by using a plant-derived anhydrosugar alcohol represented by the following formula (1) or a composition thereof as a raw material: wherein R1 to R4 each independently represent a group selected from a hydrogen atom, an alkyl group, a cycloalkyl group and an aryl group.Type: GrantFiled: September 30, 2008Date of Patent: September 18, 2012Assignee: Teijin LimitedInventors: Akimichi Oda, Eiichi Kitazono, Ryuji Nonokawa, Takanori Miyoshi
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Publication number: 20120227893Abstract: It is an object of the present invention to provide a cylindrical body which has an excellent elastic modulus and elastic recovery and is suitable for use as a scaffold material for revascularization. It is a further object of the present invention to provide a cylindrical body which has an outermost layer with high air permeability, is excellent in cell infiltration and is suitable for use as a scaffold material for revascularization. The cylindrical body of the present invention is a hollow cylindrical body consisting of a plurality of concentric layers and having an outer diameter of 0.5 to 50 mm and a thickness of 200 to 5,000 ?m, and each layer is made of aliphatic polyester fibers having an average fiber diameter of 0.05 to 50 ?m.Type: ApplicationFiled: May 16, 2012Publication date: September 13, 2012Applicant: TEIJIN LIMITEDInventors: Eiichi KITAZONO, Hiroaki KANEKO, Takanori MIYOSHI, Shinya KOMURA, Ryo SAITO
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Patent number: 8263187Abstract: A cylindrical body is produced which is composed of a fiber structure with a basis weight of 1-50 g/m2 and having a diameter of 0.5-50 mm and a bellows-shaped section, wherein the crest-to-crest spacing of the bellows-shaped section is no greater than 2 mm and the crest-to-valley depth of the bellows-shaped section is 0.01-1 mm; collagen is added to the cylindrical body to produce a composite including the cylindrical body and collagen.Type: GrantFiled: February 22, 2011Date of Patent: September 11, 2012Assignee: Teijin LimitedInventors: Eiichi Kitazono, Takanori Miyoshi, Hiroaki Kaneko, Yoshihiko Sumi, Yukako Fukuhira
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Patent number: 8137685Abstract: A hyaluronic acid compound which is a reaction product between hyaluronic acid and a phosphatidyl ethanolamine. This compound has biocompatibility and bio-safety, and can be formed into a hydrogel or molded form having a certain shape. Making use of these properties, it is used to treat a knee joint, prevent the accretion of a tissue after an operation and keep a skin wet.Type: GrantFiled: October 27, 2004Date of Patent: March 20, 2012Assignee: Teijin LimitedInventors: Eiichi Kitazono, Hiroaki Kaneko, Masaya Ito, Chiaki Fukutomi, Saki Tsuzuki, Yoshihiko Sumi
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Patent number: 8097273Abstract: The invention relates to a honeycomb film made of a biodegradable polymer which has biodegradation properties as an anti-adhesion membrane for preventing adhesion after an operation, is excellent in handling properties, and exhibits a satisfactory adhesion preventive effect stably over a desired period of time, and to a production process of the same. Above all, the invention provides an anti-adhesion membrane of a honeycomb film made of polylactic acid as a biodegradable polymer and a phospholipid and a production process of the same.Type: GrantFiled: April 8, 2004Date of Patent: January 17, 2012Assignee: Teijin LimitedInventors: Yukako Fukuhira, Eiichi Kitazono, Hiroaki Kaneko, Yoshihiko Sumi, Masatsugu Shimomura, Masaru Tanaka
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Patent number: 8017722Abstract: A process for production of a plant-derived component-containing polycarbonate represented by the following formula (3): (wherein R1-R4 each independently represent a group selected from among hydrogen, alkyl, cycloalkyl and aryl, and n is the number of repeating units), by melt polycondensation using as the starting materials a specified diol, having a total content of Na, Fe and Ca of no greater than 2 ppm and a purity analysis value of at least 99.7% by gas chromatography, and a specified carbonic acid diester, having a total content of Na, Fe and Ca of no greater than 2 ppm and a purity analysis value of at least 99.7% by gas chromatography.Type: GrantFiled: May 14, 2008Date of Patent: September 13, 2011Assignee: Teijin LimitedInventors: Akimichi Oda, Eiichi Kitazono, Toshiyuki Miyake, Masami Kinoshita, Mizuho Saito
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Patent number: 8008381Abstract: An object of the present invention is to provide a polycarbonate resin composition which has a high content of biogenic matter and is excellent in heat resistance, heat stability, moldability, hue and transparency. The present invention relates to a resin composition including 0.0005 to 0.Type: GrantFiled: April 23, 2008Date of Patent: August 30, 2011Assignee: Teijin LimitedInventors: Toshiyuki Miyake, Masami Kinoshita, Mizuho Saito, Katsuhiko Hironaka, Eiichi Kitazono, Akimichi Oda
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Publication number: 20110140312Abstract: A cylindrical body is produced which is composed of a fiber structure with a basis weight of 1-50 g/m2 and having a diameter of 0.5-50 mm and a bellows-shaped section, wherein the crest-to-crest spacing of the bellows-shaped section is no greater than 2 mm and the crest-to-valley depth of the bellows-shaped section is 0.01-1 mm; collagen is added to the cylindrical body to produce a composite including the cylindrical body and collagen.Type: ApplicationFiled: February 22, 2011Publication date: June 16, 2011Applicant: TEIJIN LIMITEDInventors: Eiichi KITAZONO, Takanori MIYOSHI, Hiroaki KANEKO, Yoshihiko SUMI, Yukako FUKUHIRA
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Patent number: 7906612Abstract: The object of the invention is to provide plant-derived component-containing polycarbonates with improved color tone, and a process for their production. This object of the invention is achieved by reducing the inorganic impurities in the polymer starting material and by reducing the inorganic impurities in the polymer product.Type: GrantFiled: August 27, 2007Date of Patent: March 15, 2011Assignee: Teijin LimitedInventors: Eiichi Kitazono, Akimichi Oda, Takanori Miyoshi
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Publication number: 20100279982Abstract: A cellulose derivative which has a suitable elastic modulus and viscosity when it is dissolved in water and is useful as an adhesion barrier. The cellulose derivative has a molecular weight of 5×103 to 5×106 and is composed of a repeating unit represented by the following formula (1): wherein R1, R2 and R3 are each independently selected from the group consisting of the following formulas (a), (b), (c) and (d) in predetermined amount: (X in the formula (c) is an alkali metal, and R4 and R5 in the formula (d) are each independently an alkyl group or alkenyl group having 10 to 28 carbon atoms).Type: ApplicationFiled: August 3, 2006Publication date: November 4, 2010Inventors: Hiroaki Kaneko, Eiichi Kitazono, Masaya Ito, Yoshihiko Sumi
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Publication number: 20100216914Abstract: A process for the preparation of a polycarbonate containing a plant-derived component excellent in hue by using a plant-derived anhydrosugar alcohol represented by the following formula (1) or a composition thereof as a raw material: wherein R1 to R4 each independently represent a group selected from a hydrogen atom, an alkyl group, a cycloalkyl group and an aryl group.Type: ApplicationFiled: September 30, 2008Publication date: August 26, 2010Applicant: Teijin LimitedInventors: Akimichi Oda, Eiichi Kitazono, Ryuji Nonokawa, Takanori Miyoshi
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Publication number: 20100179286Abstract: A polycarbonate resin composition, which comprises a plant-derived component, has improved properties such as improved moldability, biodegradability, water-absorbing property, impact resistance, melt flow characteristics, density, transparency and the like, exhibits less environmental load and is excellent in recycling efficiency is disclosed. The polycarbonate resin composition of the present invention comprises 30 to 95 parts by weight of component A (a polycarbonate comprising a plant-derived component) and 5 to 70 parts by weight of component B (an acrylate resin, a biodegradable resin, an aromatic polyester, a polyolefin or a rubber-modified styrene resin) (provided that the total of the component A and the component B is 100 parts by weight).Type: ApplicationFiled: June 4, 2008Publication date: July 15, 2010Applicant: TEIJIN LIMITEDInventors: Akimichi Oda, Eiichi Kitazono
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Publication number: 20100160601Abstract: A process for production of a plant-derived component-containing polycarbonate represented by the following formula (3): (wherein R1-R4 each independently represent a group selected from among hydrogen, alkyl, cycloalkyl and aryl, and n is the number of repeating units), by melt polycondensation using as the starting materials a diol represented by the following formula (1), having a total content of Na, Fe and Ca of no greater than 2 ppm and a purity analysis value of at least 99.7% by gas chromatography: (wherein R1-R4 each independently represent a group selected from among hydrogen, alkyl, cycloalkyl and aryl), and a carbonic acid diester represented by the following formula (2), having a total content of Na, Fe and Ca of no greater than 2 ppm and a purity analysis value of at least 99.7% by gas chromatography: (wherein R5 and R6 are groups selected from among alkyl, cycloalkyl and aryl, and R5 and R6 may be the same or different groups).Type: ApplicationFiled: May 14, 2008Publication date: June 24, 2010Inventors: Akimichi Oda, Eiichi Kitazono, Toshiyuki Miyake, Masami Kinoshita, Mizuho Saito
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Publication number: 20100076130Abstract: An object of the present invention is to provide a polycarbonate resin composition which has a high content of biogenic matter and is excellent in heat resistance, heat stability, moldability, hue and transparency. The present invention related to a resin composition comprising 0.0005 to 0.5 part by weight of at least one heat stabilizer (component S) selected from the group consisting of phosphorus-based heat stabilizers (PS) and hindered phenol-based heat stabilizers (HS) based on 100 parts by weight of a polycarbonate resin (component A) which contains a recurring unit represented by the following formula (1) as the main constituent, and a molded article thereof.Type: ApplicationFiled: April 23, 2008Publication date: March 25, 2010Inventors: Toshiyuki Miyake, Masami Kinoshita, Mizuho Saito, Katsuhiko Hironaka, Eiichi Kitazono, Akimichi Oda
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Publication number: 20100048854Abstract: A polycarbonate resin which shows a high content of biogenic matter and has excellent heat resistance, heat stability and moldability, and a manufacturing process thereof. The polycarbonate resin contains a recurring unit represent by the following formula (1) as the major constituent, and has (i) a specific viscosity of a solution prepared by dissolving 0.7 g of the resin in 100 ml of methylene chloride at 20° C. of 0.20 to 0.45, (ii) a glass transition temperature (Tg) of 150 to 200° C., and (iii) a 5% weight loss temperature (Td) of 330 to 400° C.Type: ApplicationFiled: January 29, 2008Publication date: February 25, 2010Applicant: TEIJIN LIMITEDInventors: Toshiyuki Miyake, Masami Kinoshita, Mizuho Saito, Eiichi Kitazono, Akimichi Oda
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Publication number: 20090270586Abstract: The object of the invention is to provide plant-derived component-containing polycarbonates with improved color tone, and a process for their production. This object of the invention is achieved by reducing the inorganic impurities in the polymer starting material and by reducing the inorganic impurities in the polymer product.Type: ApplicationFiled: August 27, 2007Publication date: October 29, 2009Applicant: TEIJIN LIMITEDInventors: Eiichi Kitazono, Akimichi Oda, Takanori Miyoshi
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Publication number: 20090076530Abstract: To provide a scaffold having excellent mechanical strength and cell growth capability and is suitable for use as a cell culture medium or a prosthetic material. The present invention relates to a scaffold composed of an assembly of fibers and having a 3-D structure consisting of two end faces and a side face, wherein (1) the fibers are aligned in a plane direction; (2) the fibers have a diameter of 0.05 to 50 ?m; (3) the fibers are essentially composed of a biocompatible polymer; and (4) the scaffold has an apparent density of 95 to 350 kg/m3.Type: ApplicationFiled: March 5, 2007Publication date: March 19, 2009Applicant: TEIJIN LIMITEDInventors: Chiaki Fukutomi, Hiroaki Kaneko, Eiichi Kitazono, Mika Kayashima, Miyuki Nakayama
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Publication number: 20080193538Abstract: A hyaluronic acid compound which is a reaction product between hyaluronic acid and a phosphatidyl ethanolamine. This compound has biocompatibility and bio-safety, and can be formed into a hydrogel or molded form having a certain shape. Making use of these properties, it is used to treat a knee joint, prevent the accretion of a tissue after an operation and keep a skin wet.Type: ApplicationFiled: October 27, 2004Publication date: August 14, 2008Applicant: TEIJIN LIMITEDInventors: Eiichi Kitazono, Hiroaki Kaneko, Masaya Ito, Chiaki Fukutomi, Saki Tsuzuki, Yoshihiko Sumi
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Publication number: 20070298072Abstract: It is an object of the present invention to provide a cylindrical body which has an excellent elastic modulus and elastic recovery and is suitable for use as a scaffold material for revascularization. It is a further object of the present invention to provide a cylindrical body which has an outermost layer with high air permeability, is excellent in cell infiltration and is suitable for use as a scaffold material for revascularization. The cylindrical body of the present invention is a hollow cylindrical body consisting of a plurality of concentric layers and having an outer diameter of 0.5 to 50 mm and a thickness of 200 to 5,000 ?m, and each layer is made of aliphatic polyester fibers having an average fiber diameter of 0.05 to 50 ?m.Type: ApplicationFiled: November 18, 2005Publication date: December 27, 2007Applicant: TEIJIN LIMITEDInventors: Eiichi Kitazono, Hiroaki Kaneko, Takanori Miyoshi, Shinya Komura, Ryo Saito