Patents by Inventor Nobutaka Osada
Nobutaka Osada 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: 20080302268Abstract: An ink for ink jet recording which is used for an ink jet printer in which at least a portion of a member being in contact with the ink is formed by any one of a borosilicate glass, a soda lime glass, a photosensitive glass, single crystal silicon, polysilicon, a silicon oxide film, a titanium nitride film, a zirconium film, a titanium oxide film, and a silicon nitride film, wherein a corrosion inhibitor is contained, and a phosphonium ion represented by the general formula (Formula 1) described below is contained: (wherein in Formula 1, Ra, Rb, Rc and Rd represent a linear, branched, or cyclic alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group, a halogenated alkyl group and a substituted or non substituted phenyl group, and X? represents a counter ion) is provided.Type: ApplicationFiled: April 7, 2008Publication date: December 11, 2008Inventors: Hitoshi ARITA, Nobutaka Osada, Kiyofumi Nagai, Kakuji Murakami, Akihiko Gotoh
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Patent number: 7374608Abstract: An ink for ink jet recording which is used for an ink jet printer in which at least a portion of a member being in contact with the ink is formed by any one of a borosilicate glass, a soda lime glass, a photosensitive glass, single crystal silicon, polysilicon, a silicon oxide film, a titanium nitride film, a zirconium film, a titanium oxide film, and a silicon nitride film, wherein a corrosion inhibitor is contained, and a phosphonium ion represented by the general formula (Formula 1) described below is contained: (wherein in Formula 1, Ra, Rb, Rc and Rd represent a linear, branched, or cyclic alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group, a halogenated alkyl group and a substituted or non substituted phenyl group, and X? represents a counter ion) is provided.Type: GrantFiled: March 30, 2005Date of Patent: May 20, 2008Assignee: Ricoh Company, Ltd.Inventors: Hitoshi Arita, Nobutaka Osada, Kiyofumi Nagai, Kakuji Murakami, Akihiko Gotoh
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Patent number: 7033013Abstract: An image recording method including: applying a pretreatment liquid on a surface of a recording material; and discharging a recording ink according to image signals to form an ink image on the pretreatment liquid on the surface of the recording material before the pretreatment liquid applied to the recording material has dried, wherein the recording ink includes a solvent and a component dispersed or dissolved in the solvent, wherein the pretreatment liquid includes a compound depressing at least one of the dispersibility and solubility of the component in the recording ink in an amount of 10 to 80% by weight based on total weight, and wherein the pretreatment liquid has a viscosity of from 100 to 10,000 mPa·s at 25° C.Type: GrantFiled: July 13, 2004Date of Patent: April 25, 2006Assignee: Ricoh Company LimitedInventors: Masayuki Koyano, Hitoshi Arita, Tetsuya Kaneko, Nobutaka Osada, Kakuji Murakami, Akihiko Gotoh, Akiko Bannai, Tomoko Maeda, Kiyofumi Nagai
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Publication number: 20050168552Abstract: An ink for ink jet recording which is used for an ink jet printer in which at least a portion of a member being in contact with the ink is formed by any one of a borosilicate glass, a soda lime glass, a photosensitive glass, single crystal silicon, polysilicon, a silicon oxide film, a titanium nitride film, a zirconium film, a titanium oxide film, and a silicon nitride film, wherein a corrosion inhibitor is contained, and a phosphonium ion represented by the general formula (Formula 1) described below is contained: (wherein in Formula 1, Ra, Rb, Rc and Rd represent a linear, branched, or cyclic alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group, a halogenated alkyl group and a substituted or non substituted phenyl group, and X? represents a counter ion) is provided.Type: ApplicationFiled: March 30, 2005Publication date: August 4, 2005Inventors: Hitoshi Arita, Nobutaka Osada, Kiyofumi Nagai, Kakuji Murakami, Akihiko Gotoh
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Patent number: 6918662Abstract: An ink composition including a colorant; and a solvent, wherein a zeta potential 2 between the colorant and a material selected from the group consisting of silicon, glass, silicon oxide, titanium oxide, chromium oxide, titanium nitride, silicon nitride, zirconium and polyimide is from 0 to ?50 mV at a pH of from 6.5 to 11.5. A corrosion inhibitor is preferably added to the ink composition to adjust the zeta potential 2. An ink cartridge containing the ink which optionally includes a recording head discharging the ink to form an image on a recording material, wherein the zeta potential 2 between the colorant in the ink and a material of the recording head contacting the ink is from 0 to ?50 mV at a pH of from 6.5 to 11.5. An inkjet recording apparatus including the ink cartridge and a carriage carrying the ink cartridge.Type: GrantFiled: March 11, 2004Date of Patent: July 19, 2005Assignee: Ricoh Company LimitedInventors: Hitoshi Arita, Nobutaka Osada, Kiyofumi Nagai, Kakuji Murakami, Tomoko Maeda, Akihiko Gotoh
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Patent number: 6899751Abstract: An ink for ink jet recording which is used for an ink jet printer in which at least a portion of a member being in contact with the ink is formed by any one of a borosilicate glass, a soda lime glass, a photosensitive glass, single crystal silicon, polysilicon, a silicon oxide film, a titanium nitride film, a zirconium film, a titanium oxide film, and a silicon nitride film, wherein a corrosion inhibitor is contained, and a phosphonium ion represented by the general formula (Formula 1) described below is contained: (wherein in Formula 1, Ra, Rb, Rc and Rd represent a linear, branched, or cyclic alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group, a halogenated alkyl group and a substituted or non substituted phenyl group, and X? represents a counter ion) is provided.Type: GrantFiled: October 1, 2001Date of Patent: May 31, 2005Assignee: Ricoh Company, Ltd.Inventors: Hitoshi Arita, Nobutaka Osada, Kiyofumi Nagai, Kakuji Murakami, Akihiko Gotoh
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Publication number: 20050007431Abstract: An image recording method including: applying a pretreatment liquid on a surface of a recording material; and discharging a recording ink according to image signals to form an ink image on the pretreatment liquid on the surface of the recording material before the pretreatment liquid applied to the recording material has dried, wherein the recording ink includes a solvent and a component dispersed or dissolved in the solvent, wherein the pretreatment liquid includes a compound depressing at least one of the dispersibility and solubility of the component in the recording ink in an amount of 10 to 80% by weight based on total weight, and wherein the pretreatment liquid has a viscosity of from 10 to 10,000 mPa·s at 25° C.Type: ApplicationFiled: July 13, 2004Publication date: January 13, 2005Inventors: Masayuki Koyano, Hitoshi Arita, Tetsuya Kaneko, Nobutaka Osada, Kakuji Murakami, Akihiko Gotoh, Akiko Bannai, Tomoko Maeda, Kiyofumi Nagai
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Patent number: 6799845Abstract: A recording liquid comprising a coloring agent and water, wherein the recording liquid containing a polyol (A) having a solubility in water at 20° C. of 0.2 wt. % or more and not more than 4.5 wt. %, and at least one compound (B) selected from a group consisting of compound represented by formula (1) R1,R2,R3.N→O (where R1 and R2 are an alkyl group or a hydroxyalkyl group having 1 to 3 carbon atoms, and R3 is an alkyl group or an alkenyl group having 10 to 20 carbon atoms), and of compound represented by formula (2) represented by R4,R5,R6.N—CH2—CO—O−(where R4 and R5 are an alkyl group or hydroxyalkyl group having 1 to 3 carbon atoms, and R6 is an alkyl group or alkyl group derived from cocoanut oil having 10 to 16 carbon atoms that may contain an amide group).Type: GrantFiled: December 7, 2001Date of Patent: October 5, 2004Assignee: Ricoh Company, Ltd.Inventors: Tetsuya Kaneko, Masayuki Koyano, Nobutaka Osada, Hitoshi Arita
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Publication number: 20040179066Abstract: An ink composition including a colorant; and a solvent, wherein a zeta potential 2 between the colorant and a material selected from the group consisting of silicon, glass, silicon oxide, titanium oxide, chromium oxide, titanium nitride, silicon nitride, zirconium and polyimide is from 0 to −50 mV at a pH of from 6.5 to 11.5. A corrosion inhibitor is preferably added to the ink composition to adjust the zeta potential 2. An ink cartridge containing the ink which optionally includes a recording head discharging the ink to form an image on a recording material, wherein the zeta potential 2 between the colorant in the ink and a material of the recording head contacting the ink is from 0 to −50 mV at a pH of from 6.5 to 11.5. An inkjet recording apparatus including the ink cartridge and a carriage carrying the ink cartridge.Type: ApplicationFiled: March 11, 2004Publication date: September 16, 2004Applicant: Ricoh Company LimitedInventors: Hitoshi Arita, Nobutaka Osada, Kiyofumi Nagai, Kakuji Murakami, Tomoko Maeda, Akihiko Gotoh
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Patent number: 6786588Abstract: An image recording method including: applying a pretreatment liquid on a surface of a recording material; and discharging a recording ink according to image signals to form an ink image on the pretreatment liquid on the surface of the recording material before the pretreatment liquid applied to the recording material has dried, wherein the recording ink includes a solvent and a component dispersed or dissolved in the solvent, wherein the pretreatment liquid includes a compound depressing at least one of the dispersibility and solubility of the component in the recording ink in an amount of 100 to 80% by weight based on total weight, and wherein the pretreatment liquid has a viscosity of from 10 to 10,000 mPa·s at 25° C.Type: GrantFiled: March 18, 2002Date of Patent: September 7, 2004Assignee: Ricoh Company LimitedInventors: Masayuki Koyano, Hitoshi Arita, Tetsuya Kaneko, Nobutaka Osada, Kakuji Murakami, Akihiko Gotoh, Akiko Bannai, Tomoko Maeda, Kiyofumi Nagai
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Patent number: 6730149Abstract: An ink composition including a colorant; and a solvent, wherein a zeta potential 2 between the colorant and a material selected from the group consisting of silicon, glass, silicon oxide, titanium oxide, chromium oxide, titanium nitride, silicon nitride, zirconium and polyimide is from 0 to −50 mV at a pH of from 6.5 to 11.5. A corrosion inhibitor is preferably added to the ink composition to adjust the zeta potential 2. An ink cartridge containing the ink which optionally includes a recording head discharging the ink to form an image on a recording material, wherein the zeta potential 2 between the colorant in the ink and a material of the recording head contacting the ink is from 0 to −50 mV at a pH of from 6.5 to 11.5. An inkjet recording apparatus including the ink cartridge and a carriage carrying the ink cartridge.Type: GrantFiled: January 22, 2002Date of Patent: May 4, 2004Assignee: Ricoh Company LimitedInventors: Hitoshi Arita, Nobutaka Osada, Kiyofumi Nagai, Kakuji Murakami, Tomoko Maeda, Akihiko Gotoh
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Patent number: 6730155Abstract: An aqueous ink composition contains at least one pigment selected from the group consisting of a condensed azo pigment, a condensed polycyclic pigment, a phthalocyanine pigment, and a nickel complex azo pigment, at least an anionic surfactant with ethylene oxide group or a nonionic surfactant with ethylene oxide group as a dispersant, a wetting agent, a penetrating agent, and water, with the ink composition having a surface tension of 20 mN/m or more and less than 35 mN/m. A yellow ink containing at least one pigment selected from the group consisting of C.I. Pigment Yellow 128, C.I. Pigment Yellow 138, C.I. Pigment Yellow 151, C.I. Pigment Yellow 97, and C.I. Pigment Yellow 150, a magenta ink containing at least one pigment of C.I. Pigment Red 122 or C.I. Pigment Violet 19, a cyan ink containing at least one pigment of C.I. Pigment Blue 15:3 or C.I. Pigment Blue 15:4, each color ink further containing a specific anionic surfactant and a water-soluble organic solvent, and a black ink containing C.I.Type: GrantFiled: June 29, 2001Date of Patent: May 4, 2004Assignee: Ricoh Company, Ltd.Inventors: Akihiko Gotoh, Tomoko Maeda, Akiko Bannai, Kiyofumi Nagai, Hitoshi Arita, Tetsuya Kaneko, Nobutaka Osada, Toshiroh Tokuno, Masayuki Koyano, Kakuji Murakami
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Patent number: 6695443Abstract: An ink for ink jet recording and an ink jet recording method which realize an image quality of laser printer on a plain paper in a one-pass printing mode under conditions of a volume of an ink droplet ejected being 5 to 43 Pico liter, a velocity of an ink droplet being 6 to 20 m/sec, frequency of 1 kHz and resolution of 300 dpi or more. The ink for ink jet recording is a penetrating type ink which includes (1) at least one humectant selected from glycerin, 1,3-butandiol, triethyleneglycol, 1,6-hexanediol, propyleneglycol, 1,5-pentanediol, diethyleneglycol, dipropyleneglycol, trimethylolpropane and trimethylolethane, (2) colorant contained in the amount of 6% by weight or more, (3) a polyol having 8 to 11 carbon atoms and glycolether, and an anionic surfactants or non-ionic surfactants, the ink has viscosity of 5 mPa·s or more at 25° C. and a surface tension of 40 mN/m or less.Type: GrantFiled: May 29, 2002Date of Patent: February 24, 2004Assignee: Ricoh Company, Ltd.Inventors: Hitoshi Arita, Kiyofumi Nagai, Akihiko Gotoh, Akiko Bannai, Tetsuya Kaneko, Nobutaka Osada, Tomoko Maeda, Masayuki Koyano, Kakuji Murakami, Toshiroh Tokuno
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Patent number: 6688737Abstract: A recording liquid including a coloring material, an organic solvent to disperse or to dissolve said coloring material, water, and a calix[n]arene-p-4-sulfonic acid (where n=4-8) in the form of free acid or its metal salt. The recording liquid is very suitable for inkjet recording using plain paper as recording medium. The recording liquid shows high storage stability, excellent color reproducibility with hard blurring property of mutual colors at superposed area thereof, and high resistively for light fading, for the sake of buffering nature based by both ion-capturing and -releasing, and hydrophobic material-capturing and -releasing bestowed by above-mentioned calix compound.Type: GrantFiled: December 5, 2001Date of Patent: February 10, 2004Assignee: Ricoh Company, Ltd.Inventors: Kiyofumi Nagai, Hitoshi Arita, Nobutaka Osada, Masayuki Koyano
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Publication number: 20030107632Abstract: An ink for ink jet recording and an ink jet recording method which realize an image quality of laser printer on a plain paper in a one-pass printing mode under conditions of a volume of an ink droplet ejected being 5 to 43 Pico liter, a velocity of an ink droplet being 6 to 20 m/sec, frequency of 1 kHz and resolution of 300 dpi or more. The ink for ink jet recording is a penetrating type ink which comprises (1) at least one humectant selected from glycerin, 1,3-butandiol, triethyleneglycol, 1,6-hexanediol, propyleneglycol, 1,5-pentanediol, diethyleneglycol, dipropyleneglycol, trimethylolpropane and trimethylolethane, (2) colorant contained in the amount of 6 % by weight or more, (3) a polyol having 8 to 11 carbon atoms and glycolether, and an anionic surfactants or non-ionic surfactants, the ink has viscosity of 5 mPa.s or more at 25° C. and a surface tension of 40 mN/m or less.Type: ApplicationFiled: May 29, 2002Publication date: June 12, 2003Inventors: Hitoshi Arita, Kiyofumi Nagai, Akihiko Gotoh, Akiko Bannai, Tetsuya Kaneko, Nobutaka Osada, Tomoko Maeda, Masayuki Koyano, Kakuji Murakami, Toshiroh Tokuno
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Publication number: 20030079647Abstract: A recording liquid comprising a coloring agent and water, wherein the recording liquid containing a polyol (A) having a solubility in water at 20° C. of 0.2 wt. % or more and not more than 4.5 wt. %, and at least one compound (B) selected from a group consisting of compound represented by formula (1) R1,R2,R3.N→O (where R1 and R2 are an alkyl group or a hydroxyalkyl group having 1 to 3 carbon atoms, and R3 is an alkyl group or an alkenyl group having 10 to 20 carbon atoms), and of compound represented by formula (2) represented by R4,R5,R6.N—CH2—CO—O−(where R4 and R5 are an alkyl group or hydroxyalkyl group having 1 to 3 carbon atoms, and R6 is an alkyl group or alkyl group derived from cocoanut oil having 10 to 16 carbon atoms that may contain an amide group).Type: ApplicationFiled: December 7, 2001Publication date: May 1, 2003Inventors: Tetsuya Kaneko, Masayuki Koyano, Nobutaka Osada, Hitoshi Arita
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Publication number: 20030064206Abstract: An image recording method including: applying a pretreatment liquid on a surface of a recording material; and discharging a recording ink according to image signals to form an ink image on the pretreatment liquid on the surface of the recording material before the pretreatment liquid applied to the recording material has dried, wherein the recording ink includes a solvent and a component dispersed or dissolved in the solvent, wherein the pretreatment liquid includes a compound depressing at least one of the dispersibility and solubility of the component in the recording ink in an amount of 10 to 80 % by weight based on total weight, and wherein the pretreatment liquid has a viscosity of from 10 to 10,000 mPa·s at 25 ° C.Type: ApplicationFiled: March 18, 2002Publication date: April 3, 2003Inventors: Masayuki Koyano, Hitoshi Arita, Tetsuya Kaneko, Nobutaka Osada, Kakuji Murakami, Akihiko Gotoh, Akiko Bannai, Tomoko Maeda, Kiyofumi Nagai
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Publication number: 20030010252Abstract: An ink composition including a colorant; and a solvent, wherein a zeta potential 2 between the colorant and a material selected from the group consisting of silicon, glass, silicon oxide, titanium oxide, chromium oxide, titanium nitride, silicon nitride, zirconium and polyimide is from 0 to −50 mV at a pH of from 6.5 to 11.5. A corrosion inhibitor is preferably added to the ink composition to adjust the zeta potential 2. An ink cartridge containing the ink which optionally includes a recording head discharging the ink to form an image on a recording material, wherein the zeta potential 2 between the colorant in the ink and a material of the recording head contacting the ink is from 0 to −50 mV at a pH of from 6.5 to 11.5. An inkjet recording apparatus including the ink cartridge and a carriage carrying the ink cartridge.Type: ApplicationFiled: January 22, 2002Publication date: January 16, 2003Inventors: Hitoshi Arita, Nobutaka Osada, Kiyofumi Nagai, Kakuji Murakami, Tomoko Maeda, Akihiko Gotoh
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Publication number: 20020135650Abstract: A recording liquid comprising a coloring material, an organic solvent to disperse or to dissolve said coloring material, water, and a calix[n]arene-p-4-sulfonic acid (where n=4-8) in the form of free acid or its metal salt. The recording liquid is very suitable for inkjet recording using plain paper as recording medium. The recording liquid shows high storage stability, excellent color reproducibility with hard blurring property of mutual colors at superposed area thereof, and high resistively for light fading, for the sake of buffering nature based by both ion-capturing and -releasing, and hydrophobic material-capturing and -releasing bestowed by above-mentioned calix compound.Type: ApplicationFiled: December 5, 2001Publication date: September 26, 2002Inventors: Kiyofumi Nagai, Hitoshi Arita, Nobutaka Osada, Masayuki Koyano
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Publication number: 20020096085Abstract: An aqueous ink composition contains at least one pigment selected from the group consisting of a condensed azo pigment, a condensed polycyclic pigment, a phthalocyanine pigment, and a nickel complex azo pigment, at least an anionic surfactant with ethylene oxide group or a nonionic surfactant with ethylene oxide group as a dispersant, a wetting agent, a penetrating agent, and water, with the ink composition having a surface tension of 20 mN/m or more and less than 35 mN/m. A yellow ink containing at least one pigment selected from the group consisting of C.I. Pigment Yellow 128, C.I. Pigment Yellow 138, C.I. Pigment Yellow 151, C.I. Pigment Yellow 97, and C.I. Pigment Yellow 150, a magenta ink containing at least one pigment of C.I. Pigment Red 122 or C.I. Pigment Violet 19, a cyan ink containing at least one pigment of C.I. Pigment Blue 15:3 or C.I. Pigment Blue 15:4, each color ink further containing a specific anionic surfactant and a water-soluble organic solvent, and a black ink containing C.I.Type: ApplicationFiled: June 29, 2001Publication date: July 25, 2002Applicant: Ricoh Company, Ltd.Inventors: Akihiko Gotoh, Tomoko Maeda, Akiko Bannai, Kiyofumi Nagai, Hitoshi Arita, Tetsuya Kaneko, Nobutaka Osada, Toshiroh Tokuno, Masayuki Koyano, Kakuji Murakami