Patents by Inventor Sadao Murasawa
Sadao Murasawa 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: 20050282702Abstract: A photocatalyst-containing substrate having an organic substrate and fine photocatalyst particles, wherein the fine photocatalyst particles are deposited on the surface of the organic substrate with a resin binder containing a shellac resin. The photocatalyst-containing substrate can be suitably used for clothes, interior fibrous articles such as curtains, floor mattresses, interior materials for automobiles and the like.Type: ApplicationFiled: July 17, 2003Publication date: December 22, 2005Inventors: Sadao Murasawa, Masamichi Kuroda, Fumio Kuroda
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Patent number: 6498000Abstract: A photocatalyst composite is provided which comprise a substrate having particles of a photocatalyst such as titanium oxide, adhered thereon via a less degradative adhesive such as a fluorinated polymer comprising a copolymer of a vinyl ester and/or vinyl ether and a fluoroolefin, or a silicon based polymer or cement. Furthermore, a process for producing the photocatalyst composite and a coating composition containing the photocatalyst composite are provided.Type: GrantFiled: June 27, 2001Date of Patent: December 24, 2002Assignees: Ishihara Sangyo Kaisha, Ltd.Inventors: Sadao Murasawa, Hajime Murakami, Yasuro Fukui, Mitsuru Watanabe, Akira Fujishima, Kazuhito Hashimoto
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Publication number: 20010046937Abstract: A photocatalyst composite is provided which comprise a substrate having particles of a photocatalyst such as titanium oxide, adhered thereon via a less degradative adhesive such as a fluorinated polymer comprising a copolymer of a vinyl ester and/or vinyl ether and a fluoroolefin, or a silicon based polymer or cement. Furthermore, a process for producing the photocatalyst composite and a coating composition containing the photocatalyst composite are provided.Type: ApplicationFiled: June 27, 2001Publication date: November 29, 2001Inventors: Sadao Murasawa, Hajime Murakami, Yasuro Fukui, Mitsuru Watanabe, Akira Fujishima, Kazuhito Hashimoto
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Patent number: 6277346Abstract: A photocatalyst composite is provided which comprise a substrate having particles of a photocatalyst such as titanium oxide, adhered thereon via a less degradative adhesive such as a fluorinated polymer comprising a copolymer of a vinyl ester and/or vinyl ether and a fluoroolefin, or a silicon based polymer or cement. Furthermore, a process for producing the photocatalyst composite and a coating composition containing the photocatalyst composite are provided.Type: GrantFiled: May 27, 1997Date of Patent: August 21, 2001Assignees: Ishihara Sangyo Kaisha, Ltd.Inventors: Sadao Murasawa, Hajime Murakami, Yasuro Fukui, Mitsuru Watanabe, Akira Fujishima, Kazuhito Hashimoto
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Patent number: 5612156Abstract: An electrophotographic photosensitive element for use in offset printing masters comprises an electrically conductive support having an photosensitive layer formed thereon where said layer comprises titanium dioxide and zinc oxide in a specific amount of zinc oxide based on the total amount of titanium dioxide and zinc oxide and a method for manufacturing the masters from the elments by subjecting the same to charging, exposure, development and lipophobicating treatment.Type: GrantFiled: September 3, 1993Date of Patent: March 18, 1997Assignee: Ishihara Sangyo Kaisha, Ltd.Inventors: Sadao Murasawa, Mitsuru Watanabe
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Patent number: 5547823Abstract: A photocatalyst composite is provided which comprise a substrate having particles of a photocatalyst such as titanium oxide, adhered thereon via a less degradative adhesive such as a fluorinated polymer comprising a copolymer of a vinyl ester and/or vinyl ether and a fluoroolefin, or a silicon based polymer or cement. Furthermore, a process for producing the photocatalyst composite and a coating composition containing the photocatalyst composite are provided.Type: GrantFiled: November 9, 1995Date of Patent: August 20, 1996Assignees: Ishihara Sangyo Kaisha, Ltd., Akira Fujishima, Kazuhito HashimotoInventors: Sadao Murasawa, Hajime Murakami, Yasuro Fukui, Mitsuru Watanabe, Akira Fujishima, Kazuhito Hashimoto
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Patent number: 5173386Abstract: The present invention provides novel titanium dioxide aggregates especially suitable for an electrophotographic photosensitive material. This titanium dioxide aggregates comprise sintered aggregates of fine primary particles and have a rutile type crystal structure and an oil absorption of 35-65. This titanium dioxide aggregates which are treated with a mineral acid is also provided. There is also provided an electrophotograpic photosensitive material which contains such titanium dioxide in a photosensitive layer.Type: GrantFiled: December 28, 1989Date of Patent: December 22, 1992Assignee: Ishihara Sangyo Kaisha, Ltd.Inventor: Sadao Murasawa
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Patent number: 5089367Abstract: Disclosed is an electrophotographic photoreceptor which is superior in sensitivity to light of longer wavelength region with good stability of the sensitivity and is suitable for formation of high quality color image by scanning exposure with laser beam. This photoreceptor comprises an electroconductive support and, provided thereon, a photosensitive layer containing a titanium dioxide sensitive to light of longer wavelengths which is obtained by treating the surface of titanium dioxide particles with a mineral acid and then supporting on the surface of the particles a cyanine dye sensitizer and a hydrophobic organic compound. The mineral acid is preferably hydrofluoric acid and the hydrophobic organic compound is preferably aromatic or aliphatic organic acid and acid anhydride thereof.Type: GrantFiled: January 29, 1990Date of Patent: February 18, 1992Assignee: Ishihara Sangyo Kaisha, Ltd.Inventors: Sadao Murasawa, Yoshio Hirobe, Hitoshi Ando
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Patent number: 4682881Abstract: An apparatus for producing an electrophotographic print on a photosensitive receptor which is movable through a plurality of predetermined stations so as to produce an electrostatic latent image on the photosensitive receptor, the apparatus including a rotary drum having a peripheral surface which defines an image forming section and a non-image forming section, the photosensitive sheet being placeable on the image forming section of the drum surface, a developing unit having at least one developing section for supplying a developer to the photosensitive sheet on the drum, thereby making the electrostatic latent image visible, and a device for collecting the used developer from the photosensitive sheet, the collecting device being provided axially of the drum in the non-image forming section of the peripheral surface.Type: GrantFiled: November 1, 1985Date of Patent: July 28, 1987Assignees: Dainippon Screen Mfg. Co., Ltd., Ishihara Sangyo Kaisha Ltd.Inventors: Shoji Komatsubara, Yukio Hatabe, Tooru Horikawa, Sadao Murasawa, Hajime Murakami
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Patent number: 4663257Abstract: This invention is a method of color electrophotography in which toner images are superposed sequentially on a photosensitive material sheet to form a multi-color image by using a liquid developer. According to this method, the photosensitive material sheet is made to pass by a conductive doctor member and then by an air blasting member in sequence immediately after development, so as to form the multi-color image. By this method, the multi-color image can be formed in the condition that most of a excess developer is removed while a small quantity of carrier liquid containing no residual toner particles is made to exist as a uniform liquid layer on the surface of the photosensitive material sheet, and thus a clear image free from a fogging of the surface can be obtained.Type: GrantFiled: September 23, 1985Date of Patent: May 5, 1987Assignees: Ishihara Sangyo Kaisha, Ltd., Dainippon Screen Mfg. Co., Ltd.Inventors: Sadao Murasawa, Hajime Murakami, Nobuharu Oka
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Patent number: 4525441Abstract: In practicing multi-step reproduction of color image by electrophotography using an electrophotographic photosensitive material prepared by overlaying a photosensitive layer composed mainly of titanium dioxide and a binder on an electroconductive substrate, exposure to an optical image is first carried out, then positive corona charging is carried out to form a positive electrostatic latent image and subsequently developing is carried out. Further, prior to the exposure to an optical image, negative corona charging and/or AC corona charging are additionally carried out. By this electrophotographic process effectively utilizing the photomemory effect of titanium dioxide, multi-color images can be produced, and an image having good contrast can be reproduced easily and stably.Type: GrantFiled: November 19, 1982Date of Patent: June 25, 1985Assignee: Ishihara Sangyo Kaisha, Ltd.Inventors: Kei Takahata, Sadao Murasawa, Hiroshi Ichida, Mizuho Okada, Takao Nakayama
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Patent number: 4275136Abstract: This invention relates to a liquid developer for use in color electrophotography for obtaining a photographic image by subjecting an electrostatic latent image to liquid development, and more particularly it relates to such a liquid developer for electrophotography comprising a coloring agent, a binder and an electrically insulating liquid, the particles of said coloring agent having coated or distributed thereon aluminum or zinc hydroxide.Type: GrantFiled: April 23, 1980Date of Patent: June 23, 1981Assignee: Ishihara Sangyo Kaisha, Ltd.Inventors: Sadao Murasawa, Masatsuyo Maruo
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Patent number: 4270485Abstract: A liquid developing apparatus for developing a latent electrostatic image by contacting a liquid developer with an electrophotographic photoreceptor bearing said latent electrostatic image on the undersurface thereof while moving the electrophotographic photoreceptor horizontally over a liquid developing bath. In the apparatus, a number of horizontally spaced developing electrodes in the form of bars having a vertical cross-section in the shape of a tetragon are disposed in the bath very near the undersurface of the photoreceptor. When the liquid developing apparatus is used, an electrophotographic image can be obtained having a high quality but being free from non-uniformity of image density, edge effect and flow of image or streaks.Type: GrantFiled: October 18, 1979Date of Patent: June 2, 1981Assignee: Ishihara Sangyo Kaisha Ltd.Inventors: Sadao Murasawa, Hajime Murakami, Hiroshi Ichida
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Patent number: 4144184Abstract: A liquid developer for subjecting an electrostatic latent image to wet development to obtain a copied image, which contains as a charge controlling agent a reaction product or mixture of zirconium (tetravalent) alkoxide or vanadyl (trivalent) alkoxide and an organic compound containing hydroxyl group, carboxyl group or carbon-carbon double bond in its molecule can reproduce an original clearly and exactly.Type: GrantFiled: March 3, 1978Date of Patent: March 13, 1979Assignee: Ishihara Sangyo Kaisha, Ltd.Inventors: Kei Takahata, Sadao Murasawa, Masatsuyo Maruo