Patents by Inventor Tokuya Ohta
Tokuya Ohta 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: 6357845Abstract: A leather coloring process for carrying out coloring on a natural leather, or a natural leather which has been subjected to degreasing. The coloring process is accomplished by ink-jet coloring on at least a partial area of the natural leather.Type: GrantFiled: May 12, 1999Date of Patent: March 19, 2002Assignee: Canon Kabushiki KaishaInventors: Nobuyuki Kuwabara, Tokuya Ohta, Yasushi Takatori, Sadayuki Sugama, Hiromitsu Hirabayashi, Yuji Akiyama, Miyuki Fujita
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Patent number: 6325498Abstract: An ink tank for storably receiving ink therein comprises a housing having an ink feeding port to allow ink to be storably received therein and fed through the ink feeding port, an ink absorbing member accommodated in the housing for retaining ink, the ink absorbing member being a porous block with a first surface facing the ink feeding port and having a three-dimensional net-shaped structure, and comprising a foamed block molded of a condensate of a compound having an amino group and a formaldehyde as base materials. The ink absorbing member is pressed toward the ink feeding port by pressing substantially an entire area of a second surface of the ink absorbing member opposite its first surface.Type: GrantFiled: June 7, 1995Date of Patent: December 4, 2001Assignee: Canon Kabushiki KaishaInventors: Masahiko Higuma, Jun Kawai, Yohei Sato, Yoichi Taneya, Hiroshi Sugitani, Tokuya Ohta, Kazuaki Masuda, Hiroyuki Ishinaga, Torachika Osada, Takashi Saito
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Patent number: 6224200Abstract: An ink tank includes a housing and an ink absorbing member accommodated in the housing. The ink absorbing member is constructed using a water jet cutter. The ink absorbing member is a thermosetting foamed block having a porous three-dimensional divergent circuit network; the foamed block is molded of a condensate comprising a compound having an amino group and a formaldehyde. The foamed block is formed for placement in the housing by actuating the water jet cutter and worked by actuating the water jet cutter to provide slits or holes in the ink absorbing member different from pores of the foamed block.Type: GrantFiled: September 22, 1997Date of Patent: May 1, 2001Assignee: Canon Kabushiki KaishaInventors: Masahiko Higuma, Jun Kawai, Yohei Sato, Yoichi Taneya, Hiroshi Sugitani, Tokuya Ohta, Kazuaki Masuda, Hiroyuki Ishinaga, Torachika Osada, Takashi Saito
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Patent number: 6200676Abstract: Disclosed herein is a recording medium comprising a base material, the surface of which is coated with a composition comprising, as an essential component, a polymer having a weight average molecular weight of not less than 20,000 which is obtained by reacting a polyvalent carboxylic acid, or anhydride or lower alkyl ester thereof with a polyhydroxyl compound having a weight average molecular weight of not less than 1,000 obtained by adding ethylene oxide and/or propylene oxide to a compound having 2 to 4 active hydrogen atoms.Type: GrantFiled: June 22, 1993Date of Patent: March 13, 2001Assignee: Canon Kabushiki KaishaInventors: Miyuki Matsubara, Tokuya Ohta, Masahiro Chiba, Tomomi Kaneko
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Patent number: 6174053Abstract: A printing system having an ink tank for storing ink, the ink tank having a housing having an ink feeding port formed through a first surface for feeding ink therethrough, and a second surface opposite the first. An ink absorbing member is accommodated in the housing, is a porous member having a three-dimensional net-shaped structure molded of a composition comprising a condensate of (i) a compound having an amino group and (ii) formaldehyde, and has a first surface facing the ink feeding port. An alleviating member having more resilience than the ink absorbing member is disposed between the ink absorbing member and an ink outflow portion formed through the ink feeding port and alleviates pressure applied by the ink outflow portion against the ink absorbing member. Both the alleviating member and the ink absorbing member are deformed by compression against the ink outflow portion.Type: GrantFiled: February 23, 1998Date of Patent: January 16, 2001Assignee: Canon Kabushiki KaishaInventors: Masahiko Higuma, Jun Kawai, Yohei Sato, Yoichi Taneya, Hiroshi Sugitani, Tokuya Ohta, Kazuaki Masuda, Hiroyuki Ishinaga, Torachika Osada, Takashi Saito
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Patent number: 6109742Abstract: A length of a melamine foamed block to be accommodated in an ink tank housing as measured in the longitudinal direction is dimensioned to be larger than a length of the ink tank housing as measured in the longitudinal direction. Thus, while the foamed block is accommodated in the ink tank housing, it is compressed in the direction orienting toward an ink feeding port from which ink is fed to a printing head, i.e., in the ink feeding direction. Consequently, the ink retaining force induced by the capillary force is not intensified in the compressing direction of the melamine foamed block, resulting in an ink feeding capability of the printing head being improved. On the contrary, the ink retaining force effective at a right angle relative to the compressing direction of the melamine foamed block is intensified.Type: GrantFiled: August 4, 1997Date of Patent: August 29, 2000Assignee: Canon Kabushiki KaishaInventors: Masahiko Higuma, Jun Kawai, Yohei Sato, Yoichi Taneya, Hiroshi Sugitani, Tokuya Ohta, Kazuaki Masuda, Hiroyuki Ishinaga, Torachika Osada, Takashi Saito
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Patent number: 6022383Abstract: A leather coloring process for carrying out coloring on a natural leather, or a natural leather which has been subjected to degreasing. The coloring process is accomplished by ink-jet coloring on at least a partial area of the natural leather.Type: GrantFiled: June 27, 1997Date of Patent: February 8, 2000Assignee: Canon Kabushiki KaishaInventors: Nobuyuki Kuwabara, Tokuya Ohta, Yasushi Takatori, Sadayuki Sugama, Hiromitsu Hirabayashi, Yuji Akiyama, Miyuki Fujita
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Patent number: 5718793Abstract: Disclosed herein is an image forming process, comprising the steps of:ejecting droplets of a liquid ink containing a disperse dye according to predetermined information to form an image on an ink-absorbent printing sheet;bringing the printing sheet into close contact under heat with an ink-nonabsorbent base material having a receiving layer for receiving the disperse dye to diffuse the disperse dye into the receiving layer; andseparating the printing sheet from the base material,wherein the receiving layer comprises a resin having a pencil hardness of H or harder as determined by the pencil hardness test in accordance with JIS K 5400.Type: GrantFiled: February 26, 1996Date of Patent: February 17, 1998Assignee: Canon Kabushiki KaishaInventors: Tadayoshi Inamoto, Tokuya Ohta, Shoji Koike
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Patent number: 5652610Abstract: An ink absorbing member is inserted in an ink tank housing which at least partly has a transparent portion. Used as this ink absorbing member is one having a reflection density after ink removal which is close to the reflection density of a melamine foam before ink injection. The amount of ink remaining in a cartridge of such a construction can be detected, for example, by a separate line sensor. The results of detection by the line sensor can be displayed by a remaining ink amount indicator provided on a control panel of the printing apparatus.Type: GrantFiled: May 12, 1994Date of Patent: July 29, 1997Assignee: Canon Kabushiki KaishaInventors: Jun Kawai, Yohei Sato, Yoichi Taneya, Hiroshi Sugitani, Tokuya Ohta, Kazuaki Masuda, Hiroyuki Ishinaga, Torachika Osada, Masahiko Higuma, Takashi Saito
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Patent number: 5542970Abstract: A monoazo compound of the general formula ##STR1## wherein; Y is hydrogen, methyl, methoxy, acetylamino, or nitro, or Y, cojointly with the carbon atom located in the benzene ring B at the 3-position with respect to the N.dbd.N group, may form a benzene ring; X is acetyl, benzoyl, p-toluenesulfonyl, or 4-chloro-6-hydroxy-1,3,5-triazine-2-yl; and M.sup.1, M.sup.2 and M.sup.3 each are a base selected from alkali metal atom, ammonium cation and amine salt cation. A recording liquid comprising a coloring matter, which is an image-forming component, and a liquid medium for dissolving or dispersing the coloring matter, said recording liquid being characterized by containing as coloring matter the above-mentioned monoazo compound.Type: GrantFiled: June 6, 1995Date of Patent: August 6, 1996Assignees: Canon Kabushiki Kaisha, Mitsubishi Chemical CorporationInventors: Konoe Miura, Hiroshi Takimoto, Tokuya Ohta, Masatsune Kobayashi
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Patent number: 5447562Abstract: Disclosed herein is an ink comprising a coloring material and a liquid medium, wherein the liquid medium comprises a solvent containing clusters composed of 1 to 10 molecules.Type: GrantFiled: March 28, 1994Date of Patent: September 5, 1995Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Maeda, Akihiro Tanaka, Tokuya Ohta, Isao Kimura
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Patent number: 5409529Abstract: Disclosed herein is an ink comprising at least a coloring material and a liquid medium dissolving or dispersing the coloring material therein, wherein the viscosity of the ink reaches a maximum peak in a pH range of from 4 to 10.Type: GrantFiled: August 30, 1993Date of Patent: April 25, 1995Assignee: Canon Kabushiki KaishaInventors: Akira Nagashima, Tokuya Ohta, Shinichi Tochihara, Hiromichi Noguchi
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Patent number: 4841037Abstract: A naphthalene trisazo compound represented by the general formula (I) or (II): ##STR1## wherein A and B each represents a substituted or unsubstituted benzene or naphthalene ring; m represents zero or 1; and M represents an alkali metal atom, ammonium or H.Am (wherein Am represents an amine); or ##STR2## wherein X represents a hydrogen atom, a lower alkyl group, a phenyl group or a phenyl group substituted by --SO.sub.3 M; m represents zero or 1; M represents an alkali metal atom, ammonium or H.Am (wherein Am represents an amine); A, B and C each represents a substituted or an unsubstituted benzene or naphthalene ring, provided that B and C do not represent a naphthalene ring at the same time. A recording liquid containing these compounds is suitable for use in an ink-jet recording system.Type: GrantFiled: June 10, 1986Date of Patent: June 20, 1989Assignees: Canon Kabushiki Kaisha, Mitsubishi Chemical Industries LimitedInventors: Tokuya Ohta, Masatsune Kobayashi, Yuko Suga, Konoe Miura, Hiroshi Takimoto, Tomio Yoneyama
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Patent number: 4756757Abstract: In a recording liquid comprising, as essential components, a colorant in an amount necessary to image formation, water, an a water-miscible organic solvent, said recording liquid is characterized in that the total number of colonies in the Ames test thereof is not more than four times that of the control test using sterilized water.Type: GrantFiled: December 5, 1986Date of Patent: July 12, 1988Assignee: Canon Kabushiki KaishaInventors: Masahiro Haruta, Masatsune Kobayashi, Tokuya Ohta
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Patent number: 4724001Abstract: A naphthalenedisazoic dye represented by general formula (I); ##STR1## wherein Q represents ##STR2## or a naphthalene group substituted by --SO.sub.3 M; R represents a methyl group, a methoxy group, an ethoxy group; X represents a hydrogen atom, a phenyl group substituted by --SO.sub.3 M; m represents 1 or 2; n represents 1 when X represents a hydrogen atom and n represents zero when X represents a phenyl group substituted by --SO.sub.3 M, wherein X represents a hydrogen atom and m represents 1 when Q represents a naphthalene group substituted by --SO.sub.3 M; and M represents an alkali metal atom, an ammonium, or H.A (wherein A represents an amine), and a recording liquid containing the dye. The recording liquid is suitable for use in an ink-jet recording system.Type: GrantFiled: May 7, 1986Date of Patent: February 9, 1988Assignees: Canon Kabushiki Kaisha, Mitsubishi Chemical Industries LimitedInventors: Tokuya Ohta, Masatsune Kobayashi, Yuko Suga, Konoe Miura, Hiroshi Takimoto, Tomio Yoneyama
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Patent number: 4683002Abstract: A liquid composition comprising a water-soluble dye is provided. The composition contains iron and silicon at a concentration of 9 ppm or less. A method for recording with liquid droplets formed from the liquid composition is also provided. Further, a water soluble dye for the liquid composition is provided, the dye containing iron and silicon at a total concentration of 250 ppm or less.Type: GrantFiled: November 6, 1985Date of Patent: July 28, 1987Assignee: Canon Kabushiki KaishaInventors: Konoe Mirua, Hiroshi Takimoto, Toshio Kaneko, Tokuya Ohta, Masatsune Kobayashi, Tsuyoshi Eida
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Patent number: 4655835Abstract: In a recording liquid comprising, as essential components, a colorant in an amount necessary to image formation, water, and a water-miscible organic solvent, said recording liquid is characterized in that the total number of colonies in the Ames test thereof is not more than four times that of the control test using sterilized water.Type: GrantFiled: August 8, 1985Date of Patent: April 7, 1987Assignee: Canon Kabushiki KaishaInventors: Masahiro Haruta, Masatsune Kobayashi, Tokuya Ohta
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Patent number: 4655834Abstract: In a recording liquid comprising, as essential components, a colorant in an amount necessary to image formation, water, and a water-miscible organic solvent, said recording liquid is characterized in that the total number of colonies in the Ames test thereof is not more than four times that of the control test using sterilized water.Type: GrantFiled: August 1, 1985Date of Patent: April 7, 1987Assignee: Canon Kabushiki KaishaInventors: Masahiro Haruta, Masatsune Kobayashi, Tokuya Ohta
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Patent number: 4626284Abstract: The recording liquid containing at least one of the naphthelenediazoic dyes shown by general formula (I) or (II): ##STR1## as defined in the claim, and a liquid medium for dissolving or dispersing the dye.The recording liquid of this invention has the viscosity and surface tension in the proper ranges, does not cause clogging discharging orifices of an ink-jet recorder and shows good storage stability. Furthermore, the recording liquid gives recorded images excellent in fixing speed, light resistance, water resistance, abrasion resistance and resolution.Type: GrantFiled: October 1, 1984Date of Patent: December 2, 1986Assignees: Mitsubishi Chemical Industries Ltd., Canon Inc.Inventors: Tokuya Ohta, Masatsune Kobayashi, Konoe Miura, Hiroshi Takimoto
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Patent number: 4597794Abstract: In an ink-jet recording process which comprises forming droplets of an ink and recording on an image receiving material by using the droplets, said ink is prepared by dispersing fine particles of pigment into aqueous dispersion medium containing polymer having both a hydrophilic and a hydrophobic construction portion. An average particle size (D micron) of the pigment and an average molecular weight of the polymer satisfy the relationship represented by the following equation.D.times.5.times.10.sup.2 .ltoreq.WAnd the ratio of molecular weight of the pigment to average molecular weight of the polymer is a value in the range from 1:2 to 1:150.Type: GrantFiled: July 3, 1984Date of Patent: July 1, 1986Assignee: Canon Kabushiki KaishaInventors: Tokuya Ohta, Yasuhiro Yano, Yohji Matsufuji, Masahiro Haruta, Tsuyoshi Eida