Patents by Inventor Teruaki Okawa
Teruaki Okawa 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: 10793734Abstract: Disclosed is an oil-based inkjet ink containing a colorant and a non-aqueous solvent, wherein the non-aqueous solvent contains at least 15% by mass but not more than 100% by mass, relative to the total mass of the non-aqueous solvent, of an organosilicon compound having 2 to 6 silicon atoms in one molecule, having an organic group in which a carbon atom is bonded directly to a silicon atom and in which the total number of carbon atoms and oxygen atoms is at least 4, and having a total number of carbon atoms and oxygen atoms, contained within all of the organic groups in which the total number of carbon atoms and oxygen atoms is at least 4, that is from 4 to 20 within one molecule.Type: GrantFiled: February 26, 2018Date of Patent: October 6, 2020Assignee: RISO KAGAKU CORPORATIONInventors: Hikaru Sugiura, Shinsuke Ozawa, Shinichiro Shimura, Kazuyuki Ando, Marie Morinaga, Teruaki Okawa, Noriaki Sugawara
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Publication number: 20180244937Abstract: Disclosed is an oil-based inkjet ink containing a colorant and a non-aqueous solvent, wherein the non-aqueous solvent contains at least 15% by mass but not more than 100% by mass, relative to the total mass of the non-aqueous solvent, of an organosilicon compound having 2 to 6 silicon atoms in one molecule, having an organic group in which a carbon atom is bonded directly to a silicon atom and in which the total number of carbon atoms and oxygen atoms is at least 4, and having a total number of carbon atoms and oxygen atoms, contained within all of the organic groups in which the total number of carbon atoms and oxygen atoms is at least 4, that is from 4 to 20 within one molecule.Type: ApplicationFiled: February 26, 2018Publication date: August 30, 2018Applicant: RISO KAGAKU CORPORATIONInventors: Hikaru SUGIURA, Shinsuke OZAWA, Shinichiro SHIMURA, Kazuyuki ANDO, Marie MORINAGA, Teruaki OKAWA, Noriaki SUGAWARA
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Patent number: 9624402Abstract: The method is a non-aqueous inkjet printing method including the steps of: ejecting droplets of a non-aqueous pigment ink containing at least a pigment and a non-aqueous solvent onto a surface of a printing medium to form dots composed of the non-aqueous pigment ink, and then ejecting droplets of a non-aqueous post-treatment liquid containing at least silica and an organic solvent toward the printing medium so that the droplets overlap with the dots composed of the non-aqueous pigment ink, wherein either of the non-aqueous pigment ink and the post-treatment liquid contains a water-soluble resin having an amino group.Type: GrantFiled: December 18, 2014Date of Patent: April 18, 2017Assignee: RISO KAGAKU CORPORATIONInventors: Shinichiro Shimura, Teruaki Okawa, Toshihiro Endo, Tetsuo Hosoya, Naoyuki Torita, Hikaru Sugiura, Hiroshi Hayashi
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Publication number: 20150184011Abstract: The method is a non-aqueous inkjet printing method including the steps of: ejecting droplets of a non-aqueous pigment ink containing at least a pigment and a non-aqueous solvent onto a surface of a printing medium to form dots composed of the non-aqueous pigment ink, and then ejecting droplets of a non-aqueous post-treatment liquid containing at least silica and an organic solvent toward the printing medium so that the droplets overlap with the dots composed of the non-aqueous pigment ink, wherein either of the non-aqueous pigment ink and the post-treatment liquid contains a water-soluble resin having an amino group.Type: ApplicationFiled: December 18, 2014Publication date: July 2, 2015Applicant: RISO KAGAKU CORPORATIONInventors: Shinichiro SHIMURA, Teruaki OKAWA, Toshihiro ENDO, Tetsuo HOSOYA, Naoyuki TORITA, Hikaru SUGIURA, Hiroshi HAYASHI
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Patent number: 8741047Abstract: A non-aqueous pigment ink that exhibits excellent color reproducibility and storage stability. The non-aqueous pigment ink contains two or more lake pigments and a non-aqueous solvent.Type: GrantFiled: April 12, 2012Date of Patent: June 3, 2014Assignee: Riso Kagaku CorporationInventors: Marie Morinaga, Teruaki Okawa
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Patent number: 8585815Abstract: A non-aqueous inkjet ink comprises silica and Brilliant Carmine 6B. A peak area obtained at the time of measurement of an organic acid quantity of a water extract of Brilliant Carmine 6B by use of a capillary electrophoresis apparatus is selected within the range of 50 to 300 mABU*sec.Type: GrantFiled: August 16, 2011Date of Patent: November 19, 2013Assignee: Riso Kagaku CorporationInventors: Masakatsu Arai, Syotaro Kon, Hiroshi Hayashi, Kenji Shimomura, Teruaki Okawa
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Publication number: 20120266779Abstract: A non-aqueous pigment ink that exhibits excellent color reproducibility and storage stability. The non-aqueous pigment ink contains two or more lake pigments and a non-aqueous solvent.Type: ApplicationFiled: April 12, 2012Publication date: October 25, 2012Applicant: RISO KAGAKU CORPORATIONInventors: Marie MORINAGA, Teruaki OKAWA
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Publication number: 20120255460Abstract: An oil-based ink contains at least a dye and an organic solvent, wherein the dye is contained by an amount ranging from 0.1 to 20 mass % relative to the total amount of the ink, and the organic solvent contains a five-membered heterocyclic compound having a C?O bond or a phosphoric acid ester by an amount ranging from 50 to 99 mass % relative to the total amount of the ink.Type: ApplicationFiled: April 6, 2012Publication date: October 11, 2012Applicant: RISO KAGAKU CORPORATIONInventors: Kazuya KAWAKAMI, Teruaki OKAWA
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Patent number: 8232329Abstract: An inkjet ink that prevents paper deformation such as curling, and also exhibits favorable pigment dispersibility. The inkjet ink includes at least a pigment, water, a water-soluble organic solvent having an ? value of not more than 65, and a dispersant, wherein the dispersant is a copolymer having a unit A represented by general formula (a) shown below and a unit B represented by general formula (b) shown below, and the mass ratio between the water-soluble organic solvent and the water satisfies (water-soluble organic solvent)/water=5/5 to 8/2. [In general formula (a), R1 represents a hydrogen atom or a lower alkyl group, and m represents an integer of 1 to 3.] [In general formula (b), R2 and R3 each represents a hydrogen atom or a lower alkyl group, wherein R2 and R3 may be the same or different, and n represents an integer of 1 to 250.Type: GrantFiled: August 27, 2009Date of Patent: July 31, 2012Assignees: Tokyo University of Science Educational Foundation Administrative Organization, Riso Kagaku CorporationInventors: Hidenori Otsuka, Masayuki Fukaishi, Takashi Ishizuka, Koji Ueno, Yoshihiro Saito, Teruaki Okawa, Naofumi Ezaki
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Patent number: 8201921Abstract: A printing apparatus is capable of forming images by overlappingly performing print processes for a plurality of colors with non-aqueous inks and an aqueous ink. When printing with the aqueous ink, it is possible to inhibit paper from being deformed and to realize a high density print process with a low see-through density. At least one of the plurality of colors is printed with a non-aqueous ink containing a water-insoluble solvent, and the remaining colors is printed with an aqueous ink containing a water-soluble solvent. The print process of the non-aqueous ink is performed in advance of the print process of the aqueous ink.Type: GrantFiled: January 7, 2009Date of Patent: June 19, 2012Assignee: Riso Kagaku CorporationInventors: Yoshiyuki Okada, Masahiko Kusuhata, Teruaki Okawa
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Publication number: 20120048141Abstract: A non-aqueous inkjet ink comprises silica and Brilliant Carmine 6B. A peak area obtained at the time of measurement of an organic acid quantity of a water extract of Brilliant Carmine 6B by use of a capillary electrophoresis apparatus is selected within the range of 50 to 300 mABU*sec.Type: ApplicationFiled: August 16, 2011Publication date: March 1, 2012Applicant: RISO KAGAKU CORPORATIONInventors: Masakatsu ARAI, Syotaro KON, Hiroshi HAYASHI, Kenji SHIMOMURA, Teruaki OKAWA
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Publication number: 20100159212Abstract: An inkjet ink that prevents paper deformation such as curling, and also exhibits favorable pigment dispersibility. The inkjet ink includes at least a pigment, water, a water-soluble organic solvent having an ? value of not more than 65, and a dispersant, wherein the dispersant is a copolymer having a unit A represented by general formula (a) shown below and a unit B represented by general formula (b) shown below, and the mass ratio between the water-soluble organic solvent and the water satisfies (water-soluble organic solvent)/water=5/5 to 8/2. [In general formula (a), R1 represents a hydrogen atom or a lower alkyl group, and m represents an integer of 1 to 3.] [In general formula (b), R2 and R3 each represents a hydrogen atom or a lower alkyl group, wherein R2 and R3 may be the same or different, and n represents an integer of 1 to 250.Type: ApplicationFiled: August 27, 2009Publication date: June 24, 2010Applicants: TOKYO UNIVERSITY OF SCIENCE EDUCATIONAL FOUNDATION ADMINISTRATIVE ORGANIZATION, RISO KAGAKU CORPORATIONInventors: Hidenori Otsuka, Masayuki Fukaishi, Takashi Ishizuka, Koji Ueno, Yoshihiro Saito, Teruaki Okawa, Naofumi Ezaki
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Publication number: 20090179924Abstract: A printing apparatus is capable of forming images by overlappingly performing print processes for a plurality of colors with non-aqueous inks and an aqueous ink. When printing with the aqueous ink, it is possible to inhibit paper from being deformed and to realize a high density print process with a low see-through density. At least one of the plurality of colors is printed with a non-aqueous ink containing a water-insoluble solvent, and the remaining colors is printed with an aqueous ink containing a water-soluble solvent. The print process of the non-aqueous ink is performed in advance of the print process of the aqueous ink.Type: ApplicationFiled: January 7, 2009Publication date: July 16, 2009Applicant: Riso Kagaku CorporationInventors: Yoshiyuki Okada, Masahiko Kusuhata, Teruaki Okawa
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Publication number: 20010006032Abstract: Disclosed is a water in oil type emulsion ink used for stencil printing, rarely causing a strike through phenomenon, and being capable of providing an excellent printed images; the emulsion ink comprising an oil phase and a water phase, the lightness of the light transmitted through the oil phase in the range of visible light (380 to 800 nm) being 90.0 or higher in a condition that the oil phase does not include a component of coloring agent, and the ratio by weight of the oil phase to the water phase (oil phase/water phase) being 10 to 70/90 to 30.Type: ApplicationFiled: December 19, 2000Publication date: July 5, 2001Applicant: Riso Kagaku CorporationInventor: Teruaki Okawa
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Patent number: 5902388Abstract: An emulsion ink for stencil printing is provided, which is high in transparency and does not hide previously a printed pattern when it is overlaid or printed on the pattern so as to facilitate multicolor printing with conventional stencil printing machines. The emulsion ink comprises an oil phase and a water phase and contains in the oil phase a coloring pigment together with an extending pigment that is insoluble in the oil phase, in which the ink has an optical density value of 1.0 or more as measured by a reflection densitometer when the ink is applied and dried in a thickness of 50 .mu.m onto a transparent sheet placed on a black standard board, and in which the ink has an optical density value of 0.7 or less as measured by the reflection densitometer when the transparent sheet is placed on a white standard board. Preferably, the coloring pigment constitutes 0.02 to 1%, and the extending pigment constitutes 1 to 5% by weight, of the total weight of the ink.Type: GrantFiled: June 27, 1997Date of Patent: May 11, 1999Assignee: Riso Kagaku CorporationInventors: Tomoko Matsuura, Teruaki Okawa
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Patent number: 5853466Abstract: A medium for water-in-oil (W/O) emulsion ink for stencil printing is provided, which is useful for diluting the emulsion ink to obtain a transparent and pale color ink without lowering viscosity of the ink. The medium is a water-in-oil (W/O) emulsion comprising an oil phase and a water phase, in which the medium contains an extending pigment in the oil phase but is free from coloring pigments. The medium preferably has an optical density value of 1.4 or more as measured by a reflection densitometer when the medium is applied and dried in a thickness of 50 .mu.m onto a transparent sheet placed on a black standard board, and has 32 or less of flow value in one minute as measured by a spreadometer. The extending pigment preferably constitutes 1 to 5% by weight of the total weight of the medium, and may be inorganic fine particles or organic fine particles that are insoluble in said oil phase. The inorganic fine particles may be those subjected to lipophilic treatment.Type: GrantFiled: June 27, 1997Date of Patent: December 29, 1998Assignee: Riso Kagaku CorporationInventors: Tomoko Matsuura, Teruaki Okawa