Patents by Inventor Akira Maehara
Akira Maehara 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: 20230398257Abstract: An object of the present invention is to provide a bioabsorbable and stretchable fibrous medical material that enables formation of ligation which provides a small and hard-to-unravel knot even with a weak force. The present invention provides a fibrous medical material which is a fibrous material composed of a molded article provided by spinning and drawing a bioabsorbable aliphatic polymer, wherein an elongation at break is 75% or greater, an intermediate elastic modulus in tension at a strain ranging from 0.25% and 10% is lower than an initial elastic modulus in tension at a strain ranging from 0.05% to 0.25%, the intermediate elastic modulus in tension is 400 MPa or less, and a residual strain rate after 100% deformation is 70% or less.Type: ApplicationFiled: October 25, 2021Publication date: December 14, 2023Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., National University Corporation Tokai National Higher Education and Research SystemInventors: Akira MAEHARA, Hitoshi HIRATA, Atsuhiko MURAYAMA, Yasunobu NAKAGAWA
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Publication number: 20230219273Abstract: An object of the present invention is to provide a method for producing a polymeric molded product, which does not undergo a considerable molecular weight reduction during melt-molding, even in a polymer may easily lose its molecular weight when it is in a melted state. The present invention provides a method for producing a polymeric molded product, which comprises melt-molding a polymer comprising lamellar crystals that are different in lamella thickness, in a temperature range where some of the lamellar crystals undergo melting and flowing, and the other balance lamellar crystals remain unmelted.Type: ApplicationFiled: June 2, 2021Publication date: July 13, 2023Applicants: Mitsubishi Gas Chemical Company, Inc., The University of TokyoInventors: Akira MAEHARA, Tadahisa IWATA, Taku OMURA, Taizo KABE
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Publication number: 20230211539Abstract: An object of the present invention is to provide a method for producing a polymeric molded product, the method enabling expansion of a temperature range that can be used for partial melting. The present invention provides a method for producing a polymeric molded product, which comprises subjecting a crystalline polyhydroxyalkanoate to a heating treatment at a temperature equal to or higher than a glass transition temperature; and melt-molding a polyhydroxyalkanoate yielded by the heating treatment, which comprises lamellar crystals that are different in lamellar thickness, in a temperature range where some of the lamellar crystals undergo melting and flowing, and the other balance lamellar crystals remain unmelted.Type: ApplicationFiled: June 2, 2021Publication date: July 6, 2023Applicants: Mitsubishi Gas Chemical Company, Inc., The University of TokyoInventors: Akira MAEHARA, Tadahisa IWATA, Taku OMURA, Taizo KABE
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Patent number: 11466120Abstract: A medical material comprising film obtained from a polyester wherein the polyester has a weight average molecular weight of 1,250,000 or greater determined by gel permeation chromatography calibrated with polystyrene standards. The polyester comprises a 3-hydroxybutyrate unit and a 4-hydroxybutyrate unit as polymerization units, and proportion of the 4-hydroxybutyrate unit relative to all monomer units is from 14 mol % to 40 mol %. The polyester film is useful for medical apparatus, packaging material for food, plastic sheet for agriculture, flowerpots for seedings, and sheets for construction and engineering.Type: GrantFiled: August 28, 2018Date of Patent: October 11, 2022Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventor: Akira Maehara
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Publication number: 20220203600Abstract: An object of the present invention is to provide a stretchable polyester having shape followability and flexibility by elastic response and being able to suppress deterioration over time due to secondary crystallization. The present invention provides a stretchable polyester which is an aliphatic copolymer polyester containing two or more types of monomer units, wherein the stretchable polyester contains an ?-form and an amorphous structure, and a degree of orientation determined by X-ray of the ?-form is 50% or greater.Type: ApplicationFiled: May 13, 2020Publication date: June 30, 2022Applicants: MITSUBISHI GAS CHEMICAL COMPANY, INC., The University of TokyoInventors: Akira MAEHARA, Tadahisa IWATA, Taizo KABE, Yuki KAWAMURA
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Patent number: 11279957Abstract: To provide a method for producing a polyester comprising at least a 3-hydroxybutyrate unit as a polymerization unit and having a high molecular weight and a narrow molecular weight distribution (that is, small Mw/Mn). A method for producing a polyester comprising culturing a microorganism in a culture solution containing a carbon source and a nitrogen source, the polyester having a weight average molecular weight of 1,000,000 or greater and comprising at least a 3-hydroxybutyrate unit as a polymerization unit. The culture conditions include maintenance of an osmotic pressure of the culture solution from 200 mOsm to 900 mOsm during culture period, and maintenance of a nitrogen atom concentration of the culture solution at 0.30 g/L or greater during culture period.Type: GrantFiled: August 28, 2018Date of Patent: March 22, 2022Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventor: Akira Maehara
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Publication number: 20200347416Abstract: To provide a method for producing a polyester comprising at least a 3-hydroxybutyrate unit as a polymerization unit and having a high molecular weight and a narrow molecular weight distribution (that is, small Mw/Mn). A method for producing a polyester comprising culturing a microorganism in a culture solution containing a carbon source and a nitrogen source, the polyester having a weight average molecular weight of 1,000,000 or greater and comprising at least a 3-hydroxybutyrate unit as a polymerization unit. The culture conditions include maintenance of an osmotic pressure of the culture solution from 200 mOsm to 900 mOsm during culture period, and maintenance of a nitrogen atom concentration of the culture solution at 0.30 g/L or greater during culture period.Type: ApplicationFiled: August 28, 2018Publication date: November 5, 2020Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventor: Akira MAEHARA
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Publication number: 20200255589Abstract: To provide a 4-hydroxybutyrate unit-containing polyhydroxyalkanoate having a high molecular weight and achieving a high strength at break and a high elongation at break. A polyester having a weight average molecular weight of 1250000 or greater determined by gel permeation chromatography calibrated with polystyrene standards, wherein the polyester comprises at least a 3-hydroxybutyrate unit and a 4-hydroxybutyrate unit as polymerization units, and a proportion of the 4-hydroxybutyrate unit relative to all monomer units is from 14 mol % to 40 mol %.Type: ApplicationFiled: August 28, 2018Publication date: August 13, 2020Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventor: Akira MAEHARA
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Patent number: 7542114Abstract: A liquid crystal display device, by which a reduction of costs of a color filter is realized and declining of the transmittance or reflectance due to an alignment error is suppressed, comprising a pair of substrates arranged facing to each other over a liquid crystal layer, wherein one substrate is formed pixels PXL arranged in matrix. Each pixel is formed a reflection portion for reflecting an outside light and a transmission portion for transmitting a light. The other substrate is formed a color filter colored to be different colors (red, green and blue) corresponding to respective pixels. One or more color adjusting windows CFW having a coloring concentration of zero or less than that of other portions are provided on reflection regions CFR superposing with reflection portions inside pixel regions corresponding to respective pixels.Type: GrantFiled: May 9, 2006Date of Patent: June 2, 2009Assignee: Sony CorporationInventors: Shinji Nakamura, Masato Imai, Yoko Fukunaga, Akira Maehara
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Patent number: 7468239Abstract: A mask for photolithography in which a semi-transmission film is formed so that the phase difference of lights passing through a semi-transmission portion and a transmission portion of the mask for photolithography is between (?¼+2 m) ? and (¼+2 m) ? inclusive, where m is an integer. The invention makes it possible to efficiently and properly form a thin film having a multi-step structure by a single process.Type: GrantFiled: September 29, 2004Date of Patent: December 23, 2008Assignee: Sony CorporationInventors: Masato Imai, Akira Maehara, Yoko Fukunaga
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Patent number: 7218366Abstract: A liquid crystal display device, by which a reduction of costs of a color filter is realized and declining of the transmittance or reflectance due to an alignment error is suppressed, comprising a pair of substrates arranged facing to each other over a liquid crystal layer, wherein one substrate is formed pixels PXL arranged in matrix. Each pixel is formed a reflection portion for reflecting an outside light and a transmission portion for transmitting a light. The other substrate is formed a color filter colored to be different colors (red, green and blue) corresponding to respective pixels. One or more color adjusting windows CFW having a coloring concentration of zero or less than that of other portions are provided on reflection regions CFR superposing with reflection portions inside pixel regions corresponding to respective pixels.Type: GrantFiled: December 19, 2005Date of Patent: May 15, 2007Assignee: Sony CorporationInventors: Shinji Nakamura, Masato Imai, Yoko Fukunaga, Akira Maehara
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Patent number: 7153614Abstract: A mask for photolithography in which a semi-transmission film is formed so that the phase difference of lights passing through a semi-transmission portion and a transmission portion of the mask for photolithography is between (?¼+2 m).? and (¼+2 m).? inclusive, where m is an integer. The invention makes it possible to efficiently and properly form a thin film having a multi-step structure by a single process.Type: GrantFiled: December 9, 2002Date of Patent: December 26, 2006Assignee: Sony CorporationInventors: Masato Imai, Akira Maehara, Yoko Fukunaga
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Patent number: 7148938Abstract: A liquid crystal display device, by which a reduction of costs of a color filter is realized and declining of the transmittance or reflectance due to an alignment error is suppressed, comprising a pair of substrates arranged facing to each other over a liquid crystal layer, wherein one substrate is formed pixels PXL arranged in matrix. Each pixel is formed a reflection portion for reflecting an outside light and a transmission portion for transmitting a light. The other substrate is formed a color filter colored to be different colors (red, green and blue) corresponding to respective pixels. One or more color adjusting windows CFW having a coloring concentration of zero or less than that of other portions are provided on reflection regions CFR superposing with reflection portions inside pixel regions corresponding to respective pixels.Type: GrantFiled: January 21, 2003Date of Patent: December 12, 2006Assignee: Sony CorporationInventors: Shinji Nakamura, Masato Imai, Yoko Fukunaga, Akira Maehara
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Patent number: 7136125Abstract: A liquid crystal display device, by which a reduction of costs of a color filter is realized and declining of the transmittance or reflectance due to an alignment error is suppressed, comprising a pair of substrates arranged facing to each other over a liquid crystal layer, wherein one substrate is formed pixels PXL arranged in matrix. Each pixel is formed a reflection portion for reflecting an outside light and a transmission portion for transmitting a light. The other substrate is formed a color filter colored to be different colors (red, green and blue) corresponding to respective pixels. One or more color adjusting windows CFW having a coloring concentration of zero or less than that of other portions are provided on reflection regions CFR superposing with reflection portions inside pixel regions corresponding to respective pixels.Type: GrantFiled: May 9, 2006Date of Patent: November 14, 2006Assignee: Sony CorporationInventors: Shinji Nakamura, Masato Imai, Yoko Fukunaga, Akira Maehara
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Publication number: 20060203155Abstract: A liquid crystal display device, by which a reduction of costs of a color filter is realized and declining of the transmittance or reflectance due to an alignment error is suppressed, comprising a pair of substrates arranged facing to each other over a liquid crystal layer, wherein one substrate is formed pixels PXL arranged in matrix. Each pixel is formed a reflection portion for reflecting an outside light and a transmission portion for transmitting a light. The other substrate is formed a color filter colored to be different colors (red, green and blue) corresponding to respective pixels. One or more color adjusting windows CFW having a coloring concentration of zero or less than that of other portions are provided on reflection regions CFR superposing with reflection portions inside pixel regions corresponding to respective pixels.Type: ApplicationFiled: May 9, 2006Publication date: September 14, 2006Inventors: Shinji Nakamura, Masato Imai, Yoko Fukunaga, Akira Maehara
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Publication number: 20060203156Abstract: A liquid crystal display device, by which a reduction of costs of a color filter is realized and declining of the transmittance or reflectance due to an alignment error is suppressed, comprising a pair of substrates arranged facing to each other over a liquid crystal layer, wherein one substrate is formed pixels PXL arranged in matrix. Each pixel is formed a reflection portion for reflecting an outside light and a transmission portion for transmitting a light. The other substrate is formed a color filter colored to be different colors (red, green and blue) corresponding to respective pixels. One or more color adjusting windows CFW having a coloring concentration of zero or less than that of other portions are provided on reflection regions CFR superposing with reflection portions inside pixel regions corresponding to respective pixels.Type: ApplicationFiled: May 9, 2006Publication date: September 14, 2006Inventors: Shinji Nakamura, Masato Imai, Yoko Fukunaga, Akira Maehara
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Publication number: 20060098143Abstract: A liquid crystal display device, by which a reduction of costs of a color filter is realized and declining of the transmittance or reflectance due to an alignment error is suppressed, comprising a pair of substrates arranged facing to each other over a liquid crystal layer, wherein one substrate is formed pixels PXL arranged in matrix. Each pixel is formed a reflection portion for reflecting an outside light and a transmission portion for transmitting a light. The other substrate is formed a color filter colored to be different colors (red, green and blue) corresponding to respective pixels. One or more color adjusting windows CFW having a coloring concentration of zero or less than that of other portions are provided on reflection regions CFR superposing with reflection portions inside pixel regions corresponding to respective pixels.Type: ApplicationFiled: December 19, 2005Publication date: May 11, 2006Inventors: Shinji Nakamura, Masato Imai, Yoko Fukunaga, Akira Maehara
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Publication number: 20050042528Abstract: A mask for photolithography in which a semi-transmission film is formed so that the phase difference of lights passing through a semi-transmission portion and a transmission portion of the mask for photolithography is between (?¼+2 m) ? and (¼+2 m) ? inclusive, where m is an integer. The invention makes it possible to efficiently and properly form a thin film having a multi-step structure by a single process.Type: ApplicationFiled: September 29, 2004Publication date: February 24, 2005Inventors: Masato Imai, Akira Maehara, Yoko Fukunaga
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Publication number: 20040095528Abstract: A liquid crystal display device, by which a reduction of costs of a color filter is realized and declining of the transmittance or reflectance due to an alignment error is suppressed, comprising a pair of substrates arranged facing to each other over a liquid crystal layer, wherein one substrate is formed pixels PXL arranged in matrix. Each pixel is formed a reflection portion for reflecting an outside light and a transmission portion for transmitting a light. The other substrate is formed a color filter colored to be different colors (red, green and blue) corresponding to respective pixels. One or more color adjusting windows CFW having a coloring concentration of zero or less than that of other portions are provided on reflection regions CFR superposing with reflection portions inside pixel regions corresponding to respective pixels.Type: ApplicationFiled: September 9, 2003Publication date: May 20, 2004Inventors: Shinji Nakamura, Masato Imai, Yoko Fukunaga, Akira Maehara
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Publication number: 20030165641Abstract: A mask for photolithography in which a semi-transmission film is formed so that the phase difference of lights passing through a semi-transmission portion and a transmission portion of the mask for photolithography is between (−¼+2 m).&pgr; and (¼+2 m).&pgr; inclusive, where m is an integer. The invention makes it possible to efficiently and properly form a thin film having a multi-step structure by a single process.Type: ApplicationFiled: December 9, 2002Publication date: September 4, 2003Inventors: Masato Imai, Akira Maehara, Yoko Fukunaga