Patents by Inventor Shigetoshi Hiraishi
Shigetoshi Hiraishi 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: 6960553Abstract: Disclosed is a heat-sensitive recording material having excellent properties such as high color-forming sensitivity (excellent thermal response), a high formed color density, freedom from ground fogging and excellent retainability of recorded image. The heat-sensitive recording material has a heat-sensitive recording layer containing (1) at least two diphenylsulfone derivatives, (2) a combination of a diphenylsulfone derivative with a hydroxybenzoic acid derivative, (3) a combination of a diphenylsulfone derivative with a diphenyl ether derivative, (4) a combination of a diphenylsulfone derivative with salicylamide or a derivative thereof, or (5) a combination of 4,4?-dihydroxydiphenylsulfone, salicylanilide and dibenzyloxalate.Type: GrantFiled: February 12, 2003Date of Patent: November 1, 2005Assignee: Mitsubishi Paper Mills Ltd.Inventors: Takahisa Kato, Hidetaka Tsukada, Shoji Hizatate, Shigetoshi Hiraishi, Kiichiro Wakamatsu, Katsuya Shito, Makoto Ida
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Publication number: 20030186810Abstract: Disclosed is a heat-sensitive recording material having excellent properties such as high color-forming sensitivity (excellent thermal response), a high formed color density, freedom from ground fogging and excellent retainability of recorded image. The heat-sensitive recording material has a heat-sensitive recording layer containing (1) at least two diphenylsulfone derivatives, (2) a combination of a diphenylsulfone derivative with a hydroxybenzoic acid derivative, (3) a combination of a diphenylsulfone derivative with a diphenyl ether derivative, (4) a combination of a diphenylsulfone derivative with salicylamide or a derivative thereof, or (5) a combination of 4,4′-dihydroxydiphenylsulfone, salicylanilide and dibenzyloxalate.Type: ApplicationFiled: February 12, 2003Publication date: October 2, 2003Applicant: Mitsubishi Paper Mills Ltd.Inventors: Takahisa Kato, Hidetaka Tsukada, Shoji Hizatate, Shigetoshi Hiraishi, Kiichiro Wakamatsu, Katsuya Shito, Makoto Ida
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Patent number: 5876898Abstract: A heat sensitive recording material is provided which can be simply prevented from falsification and is excellent in contrast between fixed portion and image portion, and a recording method using it is further provided. Moreover, there is provided a heat sensitive recording material capable of carrying out multicolor recording which is excellent in contrast of the image portions, density of the image portions, and image storage stability.Type: GrantFiled: July 16, 1996Date of Patent: March 2, 1999Assignee: Mitsubishi Paper Mills LimitedInventors: Haruhiko Ikeda, Shigetoshi Hiraishi, Koji Suematsu
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Patent number: 5411798Abstract: The present invention provides a magnetic recording sheet which is excellent in its production operability, magnetic recording characteristics and visible information recording characteristics. The magnetic recording sheet comprises a substrate, a magnetic recording layer which comprises a binder having a gel content of 5-75% and ferromagnetic powders and is provided on one side of the substrate, and a visible information recording layer which comprises at least one binder selected from the group consisting of a synthetic binder and a natural binder is and provided on another side of the substrate.Type: GrantFiled: July 1, 1991Date of Patent: May 2, 1995Assignee: Mitsubishi Paper Mills LimitedInventors: Haruyoshi Funae, Shigetoshi Hiraishi
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Patent number: 5395815Abstract: As a reversible heat-sensitive recording material which contains a normally colorless or palely colored electron donating dye precursor and an electron accepting compound capable of causing said dye precursor to change reversibly in color density due to the difference in cooling rate after heating, one in which images can be formed and erased with good contrast and images high in time stability can be maintained under environment of everyday life can be obtained by using a phenolic compound having at least one aliphatic hydrocarbon group of 6 or more carbon atoms as the said electron donating compound.Type: GrantFiled: June 8, 1993Date of Patent: March 7, 1995Assignee: Mitsubishi Paper Mills LimitedInventors: Mitsuhiro Ikeda, Yasuro Yokota, Shigetoshi Hiraishi, Kazuyuki Iida, Hidekazu Sano
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Patent number: 5155087Abstract: A recording material containing as a color forming system (a) a colorless or light-colored dye precursor, and (b) an isocyanate compound having aromaticity, and if necessary (c) a color developer is excellent in image retention rates in terms of light resistance and plasticizer resistance and has a large degree of freedom of hues.Type: GrantFiled: May 22, 1991Date of Patent: October 13, 1992Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Toshihiko Matsushita, Shigetoshi Hiraishi, Sadao Morishita
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Patent number: 5106814Abstract: The present invention provides a heat-sensitive recording material excellent in image stability and heat-responsiveness which contains an aromatic isocyanate compound, an imino compound and at least one compound represented by the following formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents an alkyl group.Type: GrantFiled: December 28, 1990Date of Patent: April 21, 1992Assignee: Mitsubishi Paper Mills LimitedInventors: Shigetoshi Hiraishi, Akinori Okada, Mikiya Sekine
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Patent number: 5098738Abstract: A process for producing a heat-sensitive recording material superior in the stability of both base surface and recorded image, characterized by adjusting pH of a heat-sensitive coating suspension of 5 to 12.Type: GrantFiled: March 19, 1990Date of Patent: March 24, 1992Assignees: Asahi Kasei Kogyo Kabushiki Kaisha, Mitsubishi Paper Mills LimitedInventors: Toshimitsu Nakajima, Shigetoshi Hiraishi
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Patent number: 5093305Abstract: There is disclosed a heat sensitive recording material comprising a color-forming agent consisting of an aromatic isocyanate compound and an imino compound, and a phenol compound; said recoridng material being excellent in storability of image and storability of non-image area as well.Type: GrantFiled: September 29, 1989Date of Patent: March 3, 1992Assignee: Mitsubishi Paper Mills LimitedInventors: Shigetoshi Hiraishi, Susumu Yamanobe, Yutaka Shimura
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Patent number: 5079211Abstract: The present invention provides a heat sensitive recording material which is less in fog in background area and has superior color toning effect with high image storage stability which contain a fluoran compound represented by the following formula in addition to an aromatic isocyanate compound and an imino compound having at least one >C.dbd.NH group which forms color upon application of heat: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represents a hydrogen atom, a lower alkyl group, a cyclohexyl group or an allyl group and R.sub.4 and R.sub.5 each represents a hydrogen atom, a lower alkyl group, a phenyl group, a cyclohexyl group or an aralkyl group. This heat sensitive recording material may further contain a heat fusible substance and/or a phenol compound to further improve heat responsivity or anti-fogging properties of background portion.Type: GrantFiled: October 11, 1989Date of Patent: January 7, 1992Assignee: Mitsubishi Paper Mills LimitedInventors: Yutaka Shimura, Toshimitsu Nakajima, Shigetoshi Hiraishi
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Patent number: 5043315Abstract: A heat-sensitive recording material comprising a support and a heat-sensitive recording layer provided on the support, said heat-sensitive recording layer comprising an aromatic or heterocyclic isocyanate compound and an imino compound which reacts with the isocyanate compound to form color upon heating, said isocyanate compound being in the form of particles having an average diameter of 0.7-3.0 .mu.m. With use of the heat-sensitive recording material, images sufficient in optical density for practical use can be printed.Type: GrantFiled: November 1, 1990Date of Patent: August 27, 1991Assignee: Mitsubishi Paper Mills LimitedInventors: Mikiya Sekine, Shigetoshi Hiraishi
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Patent number: 5043312Abstract: A heat-sensitive recording material comprising a support and a heat-sensitive recording layer provided on the support, said heat-sensitive recording layer comprising an aromatic or heterocyclic isocyanate compound, an imino compound, a binder, a specific alcoholic compound, and preferably, a specific biphenyl derivative. The heat-sensitive recording material have an excellent image preservability and heat responsiveness.Type: GrantFiled: November 2, 1990Date of Patent: August 27, 1991Assignee: Mitsubishi Paper Mills LimitedInventors: Shigetoshi Hiraishi, Akinori Okada, Mikiya Sekine
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Patent number: 5036039Abstract: Disclosed is a heat-sensitive recording material comprising an aromatic isocyanate compound, an imino compound which reacts with said aromatic isocyanate compound upon application of heat to form color, and a support, wherein a coating color comprising a dispersion obtained by pulverizing a mixture of said aromatic isocyanate compound and an alcoholic compound has been coated on the support. This heat-sensitive recording material is excellent in image stability and sensitivity.Type: GrantFiled: August 10, 1990Date of Patent: July 30, 1991Assignee: Mitsubishi Paper Mills LimitedInventors: Mikiya Sekine, Shigetoshi Hiraishi
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Patent number: 5013629Abstract: A color image recording material which can afford full color images superior in resolution and shelf stability is provided by forming a whitening layer having a specific property and an image receiving layer and, if necessary, a transparent film layer in succession on a photosensitive layer.Type: GrantFiled: July 26, 1989Date of Patent: May 7, 1991Assignee: Mitsubishi Paper Mills LimitedInventors: Mikiya Sekine, Shigetoshi Hiraishi
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Patent number: 4996183Abstract: A thermosensitive recording material having a thermosensitive color forming layer containing a specific dispersing agent and binder mixture showing a softening point of at least 70.degree. C. can minimize occurrence of head stain at a thermal head in thermosensitive recording. The combination of sulfonic acid-containing polyvinyl alcohol and polyacrylamide or acrylamide-acrylonitrile copolymer is preferable.Type: GrantFiled: March 28, 1989Date of Patent: February 26, 1991Assignee: Mitsubishi Paper Mills, LimitedInventors: Masaaki Otani, Shigetoshi Hiraishi, Kenji Hyodo
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Patent number: 4983569Abstract: A recording material wherein a color forming system comprising (a) a fluorene compound as a dye precursor, (b) a color developer, (c) an isocyanate compound, and (d) in imido compound, gives a developed color image having an absorption at near infrared portion and excellent image storability.Type: GrantFiled: July 12, 1989Date of Patent: January 8, 1991Assignees: Mitsubishi Paper Mills, Asahi Kasei Kogyo Kabushiki KaishaInventors: Shigetoshi Hiraishi, Mitsuru Fuchigami, Masahiro Miyauchi, Kazuo Kabashima
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Patent number: 4965237Abstract: This invention relates to a thermal printing material comprising a substrate and a thermal printing layer formed thereon containing an aromaticity-possessing isocyanate compound, an imino compound having at least one>C.dbd.NH group which reacts with said aromaticity-possessing isocyanate compound on heating to produce color, and one or more aniline derivatives having at least one amino group, said thermal printing layer being intended to improve the image storage properties, in particular, the storage properties of color-undeveloped portion (ground), and it can be utilized in recorders for measurements, facsimiles, printers, terminals of computers, labels, and automatic ticket vending machines.Type: GrantFiled: December 31, 1987Date of Patent: October 23, 1990Assignees: Mitsubishi Paper Mills, Ltd., Asahi Kasei Kogyo Kabushiki KaishaInventors: Shigetoshi Hiraishi, Kazuo Kabashima
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Patent number: 4963457Abstract: The photosensitive, pressure-sensitive recording sheet of plain paper transfer type of the present invention can be obtained by coating on a substrate, microcapsules mainly containing a photocurable resin and a reactant. This photosensitive, pressure-sensitive sheet can conduct multicolor transfer recording on a plain paper and accordingly has a very high industrial value in light of recent request for transfer recording of color manuscripts.Type: GrantFiled: June 15, 1989Date of Patent: October 16, 1990Assignee: Mitsubishi Paper Mills, LtdInventors: Toshihiko Matsushita, Shigetoshi Hiraishi, Sadao Morishita
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Patent number: 4948695Abstract: This invention relates to a photosensitive heat-transfer recording sheet and a photosensitive pressure-sensitive recording sheet both using photocurable microcapsules. These sheets enable transfer of multi-color images onto plain papers and accordingly have a very important industrial significance under the present situation where duplicate recording of color images is required.Type: GrantFiled: May 25, 1989Date of Patent: August 14, 1990Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Toshihiko Matsushita, Shigetoshi Hiraishi, Sadao Morishita
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Patent number: 4880767Abstract: A recording material wherein a color forming system comprising (a) a fluorene compound as a dye precursor, (b) a color developer, (c) an isocyanate compound, and (d) an imino compound, gives a developed color image having an absorption at near infrared portion and excellent image storability.Type: GrantFiled: November 18, 1987Date of Patent: November 14, 1989Assignees: Mitsubishi Paper Mills, Asahi Kasei Kogyo Kabushiki KaishaInventors: Shigetoshi Hiraishi, Mitsuru Fuchigami, Masahiro Miyauchi, Kazuo Kabashima