Patents by Inventor Yoshitaka Okumura
Yoshitaka Okumura 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: 6632488Abstract: An ink jet recording material which includes a paper sheet substrate and an ink receiving layer containing a xerogel porous pigment and has excellent ink-absorption and reproducibility of ink images with high clarity and precision, exhibits a water-dipping expansion of 0.3% or less, determined by the same method as the JAPAN TAPPI No. 27-B method except that the length of the recording material immersed in water is measured 15 seconds after the start of the immersion.Type: GrantFiled: February 22, 1999Date of Patent: October 14, 2003Assignee: OJI Paper Co., LTDInventors: Yoshitaka Okumura, Takaaki Kohro, Yoshiharu Kawashima, Hiromasa Kondo
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Patent number: 6565951Abstract: An ink-jet recording sheet, having an excellent ink absorption and capable of forming images with high color density and sharpness, includes a substrate and an ink-receiving layer, formed on the substrate, which includes a pigment, a self-emulsifying cationic resin including a water-insoluble acrylic copolymer having a cationic functional group and capable of being emulsified in water without assistance of an emulsifying agent, a water-soluble non-ionic polymeric material and a water-soluble cationic resin.Type: GrantFiled: August 28, 2000Date of Patent: May 20, 2003Assignee: OJI Paper Co., Ltd.Inventors: Naonobu Sugiyama, Yoshitaka Okumura, Hiromasa Kondo
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Publication number: 20030068473Abstract: An ink jet recording material which includes a paper sheet substrate and an ink receiving layer containing a xerogel porous pigment and has excellent ink-absorption and reproducibility of ink images with high clarity and precision, exhibits a water-dipping expansion of 0.3% or less, determined by the same method as the JAPAN TAPPI No. 27-B method except that the length of the recording material immersed in water is measured 15 seconds after the start of the immersion.Type: ApplicationFiled: February 22, 1999Publication date: April 10, 2003Inventors: YOSHITAKA OKUMURA, TAKAAKI KOHRO, YOSHIHARU KAWASHIMA, HIROMASA KONDO
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Patent number: 5856001Abstract: An ink jet recording medium having excellent image reproducibility, ink-drying property and pencil writing property has an ink receiving layer, formed on a substrate, including porous xerogel pigment particles, wherein the surface of the ink receiving layer has a pencil scratch value of 50 g or more determined by a pencil scratch tester for coated film in accordance with Japanese Industrial Standard K 5401-1969.Type: GrantFiled: September 5, 1997Date of Patent: January 5, 1999Assignee: OJI Paper Co. Ltd.Inventors: Yoshitaka Okumura, Akira Maeda, Yoshiharu Kawashima, Satoshi Matsuura
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Patent number: 5360780Abstract: An image-receiving sheet for thermal transfer printing comprising a substrate and an image-receiving layer disposed on said substrate, characterized in that said image-receiving layer contains thermoplastic resin fine particle aggregates. And an image-receiving sheet comprising a substrate, an intermediate layer disposed on said substrate, and an image-receiving layer disposed on said intermediate layer, characterized in that at least said intermediate layer contains thermoplastic resin fine particle aggregates.Type: GrantFiled: December 17, 1992Date of Patent: November 1, 1994Assignee: Kanzaki Paper Manufacturing Co., Ltd.Inventors: Yoshitaka Okumura, Hiromasa Kondo, Hiroshi Iwasaki, Soichi Saji, Shinsuke Irii
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Patent number: 5327474Abstract: An X-ray radiographic apparatus for medical use in photographing tomographic images and X-ray penetration images of an examinee. This apparatus has a bed horizontally movably supporting a top board for carrying the examinee, a gantry for X-ray tomography including a first X-ray source revolvable around the examinee and a first X-ray detector for detecting transmitted X-rays, a second X-ray source mounted on a moving mechanism movable on a three-dimensional coordinate system in an examination room accommodating the bed and the gantry, a high voltage unit for supplying an X-ray generating high current to the first X-ray source and the second X-ray source, a switch for selecting a destination of output of the high voltage unit, and a second X-ray detector for detecting transmitted X-rays from the second X-ray source.Type: GrantFiled: February 24, 1993Date of Patent: July 5, 1994Assignee: Shimadzu CorporationInventors: Yoshihiro Inoue, Katsunori Sukeyasu, Yoshitaka Okumura
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Patent number: 5320897Abstract: An ink jet recording paper ensuring high image qualities and a method of producing the same. The paper has excellent ink receptivity, ink dryness, image density, color reproduction and image brightness. The paper is free from the strike through of Ink. The paper does not produce paper dust which affects the performance of the recording apparatus. The paper comprises a substrate and an ink receptive image-receiving layer thereon, the image-receiving layer being formed by coating or saturating the substrate with an aqueous coating composition, the improvement comprising the substrate satisfying the following two conditions at the same time:(1) The substrate contains a porous pigment in an amount of 6 to 20% by weight, the pigment having an apparent specific gravity under JIS-K-6220 of 0.10 to 0.50 g/cm.sup.3.(2) The initial angle of contact .theta. of the surface of the substrate with water is 45.degree. to 100.degree..Type: GrantFiled: February 16, 1993Date of Patent: June 14, 1994Assignee: Kanzaki Paper Mfg. Co., Ltd.Inventors: Hiromasa Kondo, Yoshitaka Okumura, Hiromichi Yasuda
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Patent number: 5302576Abstract: An image-receiving paper for a thermal transfer recording system and a method of producing the same. The paper ensures excellent transfer, reproduction and fixability of ink dots as well as satisfactory image clearness, etc. A substrate contains a porous pigment in an amount of 6 to 20% by weight, which pigment has an apparent specific gravity under JIS-K-6220 of 0.10 to 0.50 g/cm.sup.3. The angle of contact .theta. of the surface of the substrate with water is 75 to 120.degree.. The substrate is coated or saturated with an aqueous coating composition comprising a pigment and a binder.Type: GrantFiled: January 26, 1993Date of Patent: April 12, 1994Assignee: Kanzaki Paper Mfg. Co., Ltd.Inventors: Tomofumi Tokiyoshi, Yoshitaka Okumura, Yuichiro Hayashi, Hiromasa Kondo, Hiromichi Yasuda
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Patent number: 5276002Abstract: An image-receiving sheet for thermal dye-transfer recording comprising a substrate and an image-receiving layer disposed on said substrate, said image-receiving layer being capable of receiving an image to be transferred from a coloring material-transferring sheet, characterized in that said image-receiving layer is formed of a coating composition comprising an aqueous solution or a water dispersion of a resin having a dyeing property, a carboxy-modified silicone compound, and a multi-functional aziridine derivative.Type: GrantFiled: April 25, 1991Date of Patent: January 4, 1994Assignee: Kanzaki Paper Manufacturing Co., Ltd.Inventors: Yoshitaka Okumura, Hiromasa Kondo
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Patent number: 5268347Abstract: An image-receiving sheet for thermal transfer printing comprising a substrate, an intermediate layer and an image-receiving layer, said intermediate layer and said image-receiving layer being disposed in this order on said substrate, characterized in that said intermediate layer comprises a layer containing (a) fine particles of one or more kinds of resins selected from the group consisting of thermosetting resins and other resins having a softening point of higher than 150.degree. C. and (b) fine particles of a polyolefin resin as the main constituents and the amount of said fine particles (a) contained in the intermediate layer is in the range of from 5 to 90% by weight.The image-receiving sheet excells in the whiteness and opacity and exhibits an excellent recording sensitivity. The image-receiving sheet provides high quality images accompanied with no missing dot when used in a thermal transfer printing system wherein a thermally sublimable dye is utilized.Type: GrantFiled: October 18, 1990Date of Patent: December 7, 1993Assignees: Kanzaki Paper Manufacturing Co., Ltd., Dai Nippon Insatsu Kabushiki KaishaInventors: Yoshitaka Okumura, Kazuo Watanabe, Hiromasa Kondo, Noritaka Egashira, Naoto Satake
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Patent number: 4837200Abstract: An image-receiving sheet for thermal transfer printing comprising on a substrate an intermediate layer made primarily of a resin insoluble in organic solvents, and an image-receiving layer made primarily of a resin soluble in organic solvents and formed on the intermediate layer. This type of sheet is significantly improved in smoothness and blocking properties, enabling one to obtain print images of a very high quality, by thermal transfer printing, which are substantially free from the known problem relating to a missing transfer portion and which are high in the optical density for images as printed.Type: GrantFiled: July 21, 1988Date of Patent: June 6, 1989Assignees: Kanzaki Paper Manufacturing Co., Ltd., Dai Nippon Insatsu Kabushiki KaishaInventors: Hiromasa Kondo, Yoshitaka Okumura, Terunobu Fukui, Noritaka Egashira, Tamami Iwata, Naoto Satake