Patents by Inventor Eiichi Kawamura
Eiichi Kawamura 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: 5605777Abstract: A predetermined processing liquid is supplied by a liquid supplying unit to a sheet of transfer paper having a surface on which toner is stably attached. An adhesive state of the toner on the transfer paper sheet is changed to an unstable adhesive state. The processing liquid is constructed by water, aqueous solutions of a surfactant, a water-soluble polymer, etc. The transfer paper sheet including the processing liquid is fed to a toner separating unit. While the toner is heated and pressurized in the toner separating unit, the toner is attached to a separating roller having a surface on which the softened toner is easily attached. The toner separating unit then separates only the transfer paper sheet from the surface of the separating roller by a separating claw. The processing liquid is removed from the transfer paper sheet by heating the transfer paper sheet, etc. using a drying unit such that the transfer paper sheet can be reused for a copying machine, etc.Type: GrantFiled: November 27, 1995Date of Patent: February 25, 1997Assignee: Ricoh Company, Ltd.Inventors: Kazuhiro Ando, Yoshiaki Miyashita, Youichi Asaba, Kiyoshi Tanikawa, Satoshi Singuryo, Shinichi Kuramoto, Sadao Takahashi, Yoshiyuki Kimura, Tadashi Saito, Mitsuru Ohminato, Masaru Nakano, Eiichi Kawamura
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Patent number: 5593937Abstract: An image-bearing member for supporting thereon images formed by a thermofusible or heat-softening ink containing a dye coloring component, at least part of the image-bearing member having a paper layer which contains cellulose fibers and a discoloring agent capable of discoloring the dye coloring component of the thermofusible or heat-softening ink. In addition, a method for recycling the above-mentioned image-bearing member is also disclosed.Type: GrantFiled: July 22, 1994Date of Patent: January 14, 1997Assignee: Ricoh Company, Ltd.Inventors: Tadashi Saito, Kiyoshi Tanikawa, Eiichi Kawamura, Toshiyuki Kawanishi
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Patent number: 5540815Abstract: A method of recycling a copy sheet carrying a hydrophobic image thereon by impregnating the sheet with a water-containing separating liquid, causing the to image contact an image separating member, and heating the sheet for thereby transferring the image to the image separating member. The image separating member has a critical surface tension of 25 mN/m or above.Type: GrantFiled: December 9, 1994Date of Patent: July 30, 1996Assignee: Ricoh Company, Ltd.Inventors: Masato Igarashi, Toshiyuki Kawanishi, Eiichi Kawamura, Narihito Kojima
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Patent number: 5538348Abstract: In a self-aligning roller bearing providing an outer race, an inner race, a plurality of barrel-shaped rollers, and a pair of cages, guide surfaces formed on outward flange portions of the cages for guiding the barrel-shaped rollers are caused to come closer to ends of the barrel-shaped rollers, so that the barrel-shaped rollers can be guided without fail even if an axial load is received. Therefore, the barrel-shaped rollers are prevented from being skewed, from increasing in torque required for rotating the barrel-shaped rollers, and from seizing up the barrel-shaped rollers.Type: GrantFiled: October 12, 1994Date of Patent: July 23, 1996Assignee: NSK Ltd.Inventors: Akiyoshi Honda, Kunio Fukuda, Masahide Matsubara, Eiichi Kawamura, Fukuji Kikkawa
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Patent number: 5521138Abstract: A reversible thermosensitive coloring composition is composed of an electron-donor coloring compound; an electron-acceptor compound which is capable of producing a colored material with a regularly aggregated structure in the electron-doner coloring compound at a color development initiation temperature to obtain a color development state, and is capable of crystallizing out of the colored material at a decolorization initiation temperature which is lower than the color development initiation temperature; and an organic compound serving as a decolorization-accelerating agent capable of inducing the destruction of the regularly aggregated structure of the colored material to accelerate the decolorization of the composition. A reversible thermosensitive coloring recording medium is composed of a support and a recording layer formed thereon, which contains the above-mentioned reversible thermosensitive coloring composition.Type: GrantFiled: June 23, 1992Date of Patent: May 28, 1996Assignee: Ricoh Company, Ltd.Inventors: Masaru Shimada, Hiroshi Goto, Eiichi Kawamura, Shoji Maruyama, Keishi Kubo, Kyoji Tsutsui
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Patent number: 5432534Abstract: A reversible thermosensitive coloring composition is composed of (i) an electron-donor coloring compound and (ii) an electron-acceptor compound selected from the group consisting of an organic phosphoric acid compound, an aliphatic carboxylic acid, and a phenolic compound, each having a straight chain or branched chain alkyl group or alkyenyl group having 12 or more carbon atoms, the electron-donor coloring compound and the electron-acceptor compound being capable of reacting to induce color formation in the reversible thermosensitive coloring composition at the eutectic temperature thereof. The electron-donor coloring compound and the electron-acceptor compound, when fused and colored in a mixed state, with application of heat thereto, followed by rapidly cooling the fused mixture, exhibit an exothermic peak in a temperature elevation process in a differential scanning calorific analysis or in a differential thermal analysis.Type: GrantFiled: November 9, 1994Date of Patent: July 11, 1995Assignee: Ricoh Company, Ltd.Inventors: Shoji Maruyama, Hiroshi Goto, Eiichi Kawamura, Masaru Shimada, Keishi Kubo, Kyoji Tsutsui, Hideaki Ema, Takehito Yamaguchi, Hiroki Kuboyama, Ichiro Sawamura, Keishi Taniguchi
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Patent number: 5395433Abstract: A reversible thermosensitive coloring composition is composed of (i) an electron-donor coloring compound and (ii) an electron-acceptor compound selected from the group consisting of an organic phosphoric acid compound, an aliphatic carboxylic acid, and a phenolic compound, each having a straight chain or branched chain alkyl group or alkyenyl group having 12 or more carbon atoms, the electron-donor coloring compound and the electron-acceptor compound being capable of reacting to induce color formation in the reversible thermosensitive coloring composition at the eutectic temperature thereof. The electron-donor coloring compound and the electron-acceptor compound, when fused and colored in a mixed state, with application of heat thereto, followed by rapidly cooling the fused mixture, exhibit an exothermic peak in a temperature elevation process in a differential scanning calorific analysis or in a differential thermal analysis.Type: GrantFiled: November 30, 1993Date of Patent: March 7, 1995Assignee: Ricoh Company, Ltd.Inventors: Shoji Maruyama, Hiroshi Goto, Eiichi Kawamura, Masaru Shimada, Keishi Kubo, Kyoji Tsutsui, Hideaki Ema, Takehito Yamaguchi, Hiroki Kuboyama, Ichiro Sawamura, Keishi Taniguchi
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Patent number: 5296439Abstract: A reversible thermosensitive coloring composition is composed of (i) an electron-donor coloring compound and (ii) an electron-acceptor compound selected from the group consisting of an organic phosphoric acid compound, an aliphatic carboxylic acid, and a phenolic compound, each having a straight chain or branched chain alkyl group or alkenyl group having 12 or more carbon atoms, the electron-donor coloring compound and the electron-acceptor compound being capable of reacting to induce color formation in the reversible thermosensitive coloring composition at the eutectic temperature thereof. The electron-donor coloring compound and the electron-acceptor compound, when fused and colored in a mixed state, with application of heat thereto, followed by rapidly cooling the fused mixture, exhibit an exothermic peak in a temperature elevation process in a differential scanning calorific anlaysis or in a differential thermal analysis.Type: GrantFiled: December 24, 1991Date of Patent: March 22, 1994Assignee: Ricoh Company, Ltd.Inventors: Shoji Maruyama, Hiroshi Goto, Eiichi Kawamura, Masaru Shimada, Keishi Kubo, Kyoji Tsutsui, Hideaki Ema, Takehito Yamaguchi, Hiroki Kuboyama, Ichiro Sawamura, Keishi Taniguchi
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Patent number: 5234274Abstract: A self-aligning roller bearing with retainer has a plurality of the rollers having an end face in which a ring-shaped concave section is formed, and a pair of retainers having a frustum shape, and arranged with the larger diameter section axially inside, the retainer having a pocket to hold each roller and, an outward flange extending from the larger diameter section, and the outward flange having a tongue coming into slidable contact with the ring-shaped concave section of the rollers.Type: GrantFiled: December 1, 1992Date of Patent: August 10, 1993Assignee: NSK Ltd.Inventors: Akiyoshi Honda, Eiichi Kawamura
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Patent number: 4632403Abstract: A stern tube seal device providing a seal about a rotatable shaft includes an annular case member arranged about the outer periphery of a shaft, a gap between the annular case member and the shaft sealed by a plurality of lip seals, a floating ring seal or a pressure type hollow ring is arranged in the middle of the lip seal, and pressure fluid is charged into the rear portion of the floating ring seal or into the pressure type hollow ring to enhance the sealing effect by the pressure of the fluid.Type: GrantFiled: February 15, 1985Date of Patent: December 30, 1986Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Eagle Industry Co., Ltd.Inventors: Kenichiro Ishitani, Takashi Unseki, Saburo Amiboshi, Eiichi Kawamura
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Patent number: 4609928Abstract: A thermosensitive image transfer medium consisting of (i) an image transfer sheet having an image transfer layer consisting essentially of a leuco dye, and (ii) an acceptor sheet having an acceptor layer consisting essentially of a color developer which induces color formation in the leuco dye, the color developer being a mixture of a bisphenol derivative of the following formula and a p-hydroxybenzoic acid ester with a melting point of 100.degree. C. or less, and, of the image transfer layer and said acceptor layer, at least one layer containing a porous filler having an oil absorption of 50 ml/100 g or more as measured in accordance with the Japanese Industrial Standard K 5101, ##STR1## wherein X.sup.1 and X.sup.2 each represent a lower alkyl group or halogen, R.sup.1 and R.sup.2 each represent hydrogen or an alkyl group having 1 to 6 carbon atoms, and m and n each represent an integer of 0 through 4.Type: GrantFiled: December 13, 1983Date of Patent: September 2, 1986Assignee: Ricoh Company, Ltd.Inventors: Keishi Kubo, Nobuhiro Takigawa, Eiichi Kawamura
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Patent number: 4538164Abstract: This invention relates to a heat-sensitive transfer medium comprising a transfer sheet having a transfer layer containing a leuco dye as the main component and a receiving sheet having a receiving layer containing a developer for said leuco dye as the main component, characterized in that said receiving layer contains porous filler having an oil absorption amount of at least 50 ml/100 g and a phenolic compound expressed by the general formula, ##STR1## wherein R represents an alkylene group and X represents hydrogen or a halogen atom.Type: GrantFiled: November 28, 1984Date of Patent: August 27, 1985Assignee: Ricoh Co., Ltd.Inventors: Nobuhiro Takigawa, Hideo Watanabe, Kanzirou Kawasaki, Keishi Kubo, Minoru Hakiri, Eiichi Kawamura
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Patent number: 4534569Abstract: A stern tube seal device providing a seal about a rotatable shaft includes an annular case member arranged about the outer periphery of a shaft, a gap between the annular case member and the shaft is sealed by a plurality of lip seals, a floating ring seal or a pressure type hollow ring is arranged in the middle of the lip seal, and pressure fluid is charged into the rear portion of the floating ring seal or into the pressure type hollow ring to enhance the sealing effect by pressure of the fluid.Type: GrantFiled: March 26, 1984Date of Patent: August 13, 1985Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Eagle Industry Co., Ltd.Inventors: Kenichiro Ishitani, Takashi Unseki, Saburo Amiboshi, Eiichi Kawamura
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Patent number: 4513052Abstract: A heat-sensitive recording material comprising a support and a heat-sensitive color forming layer formed on said support that comprises a colorless or pale-color leuco dye and an acidic material capable of making said leuco dye develop color when heated, wherein said heat-sensitive color forming layer further comprises at least one of the compounds which are expressed by the following general formulas (I), (II) or (III): ##STR1## (wherein X.sup.1 represents a hydrogen atom or a halogen atom; Y.sup.1 represents an alkyl group, an alkoxy group, a halogen atom, a benzyl group, a hydroxyl group, a carboxyl group or an allyl group; m and n are each an integer ranging from 1 to 3, respectively; and X.sup.1 and Y.sup.1 may be either identical or different from each other when m or n is an integer of 2 or more) ##STR2## (wherein X.sup.2 represents a hydrogen atom or a halogen atom; Y.sup.Type: GrantFiled: November 16, 1983Date of Patent: April 23, 1985Assignee: Ricoh Co., Ltd.Inventors: Keishi Kubo, Eiichi Kawamura
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Patent number: 4482158Abstract: A stern tube seal device wherein an annular case member is arranged in the outer periphery of a shaft, a gap between both the members is sealed in multiple stage by using a plurality of seal members such as a segment seal member, a lip seal member and the like, and pressure gas is fed at the rear of the segment seal member which forms one of these seal members to enhance a seal effect by pressure of the gas.Type: GrantFiled: March 26, 1984Date of Patent: November 13, 1984Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Eagle Industry Co., Ltd.Inventors: Kenichiro Ishitani, Toshiharu Hamasaki, Shoji Shiomi, Eiichi Kawamura
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Patent number: 4482159Abstract: A stern tube seal device wherein an annular case member is arranged in the outer periphery of a shaft, a mechanical seal is arranged in a gap therebetween and at a position at the side of the ship, a limited leaking type seal is arranged at a position at the side of sea water, and pressure fluid is fed in the intermediate between both the seal members to enhance a sealing effect by pressure of the pressure fluid.Type: GrantFiled: March 26, 1984Date of Patent: November 13, 1984Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Eagle Industry Co., Ltd.Inventors: Kenichiro Ishitani, Eiichi Kawamura
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Patent number: 4352860Abstract: A thermosensitive recording material comprising a support member and a thermosensitive layer formed on the support member, which thermosensitive layer contains a colorless or light-colored leuco dye and acidic material, capable of forming a color upon application of heat to the thermosensitive layer, and at least one amide compound selected from the group consisting of amide compounds represented by the formulas ##STR1## wherein R.sub.1 represents an alkyl group with 1 to 30 carbon atoms, a phenyl group or a substituted phenyl group; R.sub.2 represents hydrogen or an alkyl group with 1 to 4 carbon atoms; R.sub.3 represents an alkyl group with 1 to 30 carbon atoms; R.sub.4 and R.sub.Type: GrantFiled: May 7, 1981Date of Patent: October 5, 1982Assignee: Ricoh Company, Ltd.Inventors: Keishi Kubo, Eiichi Kawamura
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Patent number: 3997488Abstract: This invention provides non-aqueous dispersions containing a graft-copolymer and at least one substance selected from the group consisting of wax and polyethylene in an organic solvent having a high resistivity and a low dielectric constant, said dispersions being useful for coatings, especially binders for use in electrostatic coating and toners for use in electrophotography.Type: GrantFiled: August 5, 1975Date of Patent: December 14, 1976Assignee: Ricoh Co., Ltd.Inventors: Kazuo Tsubuko, Eiichi Kawamura