Patents by Inventor Tetsuji Kawakami
Tetsuji Kawakami 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: 5346653Abstract: The invention relates to a non-linear optical material comprising a salt of an organic compound with an optically active organic acid, wherein said organic compound has a conjugated .pi. electron system containing both electron donor and acceptor groups and has at least one substituent group represented by the following formulas (1), (2) and (3) which is located outside of said conjugated .pi. electron system. The invention also concerns a method of manufacturing the optical material and an optical converter which uses the non-linear optical material. ##STR1## According to the invention, a second-order non-linear optical material, which is readily capable of crystal growth, permits a large crystal to be readily obtained, and ensures high hardness of the crystal and gives excellent processibility and non-linear optical characteristics.Type: GrantFiled: January 31, 1992Date of Patent: September 13, 1994Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yusuke Ozaki, Hisashi Minemoto, Nobuo Sonoda, Tetsuji Kawakami, Tatsurou Kawamura, Katsuya Wakita
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Patent number: 5347394Abstract: The invention provides a nonlinear optical material comprising a compound represented by the general formula (1): ##STR1## wherein R.sup.1 denotes an electron attractive group, R.sup.2 denotes a group selected from the group consisting of a hydrogen atom, methyl group, methoxy group and electron attractive group, R.sup.3 denotes a straight-chain alkylene group, and X denotes an oxygen or sulfur atom. The invention also relates to a method of manufacturing a nonlinear optical material comprising the steps of dissolving a compound represented by the general formula (1) in an organic solvent, and evaporating the solvent while keeping its temperature constant or lowering its temperature, thereby growing a crystal of the compound represented by the general formula (1).Type: GrantFiled: April 6, 1993Date of Patent: September 13, 1994Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsuya Wakita, Tetsuji Kawakami, Nobuo Sonoda, Hisashi Minemoto
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Patent number: 5334574Abstract: Thermal dye transfer printing systems which are adapted For multiple-use printing modes wherein one dye transfer sheet is repeatedly used and which comprise a dye transfer sheet having, on a substrate, a dye transfer layer containing a sublimable dye and a binder resin and a dye receiving sheet having a dye receiving layer which has a diffusion rate of the dye smaller than the dye transfer layer. This is effective in suppressing a lowering of printing density owing to the increase in number of printing cycles using one dye transfer sheet. Alternatively, the dye transfer sheet is constituted such that the dye transfer layer is made of a plurality of sub-layers in which the concentration of the dye decreases from the sub-layer formed directly on the substrate toward the surface side of the dye transfer layer. The dye is invariably supplied from the higher concentration sub-layers to ensure full color printing with a remarkably increasing number of multiple-use printing cycles.Type: GrantFiled: June 29, 1992Date of Patent: August 2, 1994Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiromu Matsuda, Tetsuji Kawakami, Keiichi Yubakami, Akihiro Imai, Nobuyoshi Taguchi
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Patent number: 5292714Abstract: A dye transfer thermal printing sheet which can give a color record image excellent in color reproducibility and weather resistance with middle shade including black and sufficiently saturated density. This printing sheet includes a substrate on which are arranged, in face-sequence, coloring material layers which are different in hue and contain at least one dye represented by the formula (I), at least one dye represented by the formula (II) and at least one dye represented by the formula (III).Type: GrantFiled: February 10, 1993Date of Patent: March 8, 1994Assignees: Matsushita Electric Industrial Co., Ltd., Mitsubishi Kasei CorporationInventors: Tetsuji Kawakami, Akihiro Imai, Nobuyoshi Taguchi, Yukichi Murata, Takao Hirota
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Patent number: 5274061Abstract: The present invention provides novel polymerizable substituted amide compounds which are derived from isocyanate compounds and which are useful in the preparation of nonlinear optical materials. The polymerizable substituted amide compound of the present invention represents by the formula; ##STR1## wherein R and R.sup.1 respectively represent a hydrogen atom or a lower alkyl group, A represents --X--(CH.sub.2).sub.n -- in which X represents an oxygen atom or --NH-- and n is an integer of 1 to 6, and m shows 0 or 1. The present invention also provides a homo- or co-polymer derived from the polymerizable substituted amide compound. The present invention further provides a nonlinear optical composition containing the homo- or co-polymer.Type: GrantFiled: December 8, 1992Date of Patent: December 28, 1993Assignees: Nippon Paint Co., Ltd., Matsushita Electric Industrial Co., Ltd.Inventors: Satoshi Urano, Noriyuki Tsuboniwa, Tetsuji Kawakami, Katsuya Wakita
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Patent number: 5217941Abstract: The present invention provides a dye transfer type thermal printing sheet which can give a color record image excellent in color reproducibility and weather resistance with middle shade including black and sufficiently saturated density. This printing sheet comprising a substrate on which are arranged, in face-sequence, coloring material layers which are different in hue and contain either of at least one dye represented by the formula (I), at least one dye represented by the formula (II) and at least one dye represented by the formulas (III)-(VI).Type: GrantFiled: October 10, 1990Date of Patent: June 8, 1993Assignees: Matsushita Electric Industrial Co., Ltd., Mitsubishi Kasei CorporationInventors: Tetsuji Kawakami, Akihiro Imai, Nobuyoshi Taguchi, Yukichi Murata, Takao Hirota
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Patent number: 5200552Abstract: The present invention provides novel polymerizable substituted amide compound which are derived from the isocyanate compounds and which are useful in the preparation of nonlinear optical materials. The polymerizable substituted amide compounds of the present invention are represented by the formula; ##STR1## wherein R and R.sup.1 respectively represent a hydrogen atom or a lower alkyl group, A represents --X--(CH.sub.2).sub.n -- in which X represents an oxygen atom or --NH-- and n is an integer of 1 to 6, and m shows 0 or 1. The present invention also provides a homo- or co-polymer derived from the polymerizable substituted amide compound. The present invention further provides a nonlinear optical composition containing the homo- or co-polymer.Type: GrantFiled: September 25, 1991Date of Patent: April 6, 1993Assignees: Nippon Paint Co., Ltd., Matsushita Electric Industrial Co., Ltd.Inventors: Satoshi Urano, Noriyuki Tsuboniwa, Tetsuji Kawakami, Katsuya Wakita
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Patent number: 5154858Abstract: A nonlinear optical compound of the formula: ##STR1## and optionally a .pi. electron conjugated organic compound having an electron donative group and an electron attractive group, which has high conversion efficiency.Type: GrantFiled: November 20, 1991Date of Patent: October 13, 1992Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsuya Wakita, Nobuo Sonoda, Hisashi Minemoto, Tetsuji Kawakami, Tatsurou Kawamura, Yusuke Ozaki
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Patent number: 5146237Abstract: A method of resistive sheet transfer recording is disclosed, in which the thermal diffusion coefficient of a resistive sheet (1) in the range of 1 to 100.times.10.sup.-6 m.sup.2 /s is combined with that of an electrode head (2) in the range of 0.1 to 50.times.10.sup.6 m.sup.2 /s, thereby making it possible to form a high-quality image at high sensitivity and high speed.Type: GrantFiled: January 11, 1990Date of Patent: September 8, 1992Assignee: Matushita Electric Industrial Co., Ltd.Inventors: Nobuyoshi Taguchi, Akihiro Imai, Hiromu Matsuda, Tetsuji Kawakami, Keiichi Yubakami
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Patent number: 5145827Abstract: It can be obtained a receiving sheet for a dye transfer type thermal printing which is improved in a curing speed, image reliability, recording sensitivity, and dot reproducibility, and useful for high speed and/or relative-speeds printing by arranging a polymer layer on a substrate and then a cured resin layer of a moisture-curable resin on the polymer layer.Type: GrantFiled: June 12, 1990Date of Patent: September 8, 1992Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akihiro Imai, Tetsuji Kawakami, Hiromu Matsuda, Keiichi Yubakami, Nobuyoshi Taguchi
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Patent number: 5137865Abstract: Thermal dye transfer printing systems which are adapted for multiple-use printing modes wherein one dye transfer sheet is repeatedly used and which comprise a dye transfer sheet having, on a substrate, a dye transfer layer containing a sublimable dye and a binder resin and a dye receiving sheet having a dye receiving layer which has a diffusion rate of the dye smaller than the dye transfer layer. This is effective in suppressing a lowering of printing density owing to the increase in number of printing cycles using one dye transfer sheet. Alternatively, the dye transfer sheet is constituted such that the dye transfer layer is made of a plurality of sub-layers in which the concentration of the dye decreases from the sub-layer formed directly on the substrate toward the surface side of the dye transfer layer. The dye is invariably supplied from the higher concentration sub-layers to ensure full color printing with a remarkably increasing number of multiple-use printing cycles.Type: GrantFiled: March 3, 1989Date of Patent: August 11, 1992Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiromu Matsuda, Tetsuji Kawakami, Keiichi Yubakami, Akihiro Imai, Nobuyoshi Taguchi
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Patent number: 5118657Abstract: A dye transfer sheet consisting of a transfer substrate and a coloring material layer comprising a high concentration layer which comprises a dye and is formed on the transfer substrate and a low concentration layer which comprises a water soluble resin or water dispersible resin having a polydimethylsiloxane structure and has a lower dye concentration than the high concentration layer and is formed on the high concentration layer. A dye transfer sheet consisting of a transfer substrate and a coloring material layer comprising a high concentration layer which comprises a dye and a binder polymer cross-linked with a cross-linking agent and is formed on the transfer substrate and a low concentration layer which comprises a water soluble resin or water dispersible resin and has a lower dye concentration than the high concentration layer and is formed on the high concentration layer.Type: GrantFiled: September 26, 1989Date of Patent: June 2, 1992Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tetsuji Kawakami, Hiromu Matsuda, Keiichi Yubakami, Akihiro Imai, Nobuyoshi Taguchi
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Patent number: 5063198Abstract: The dye transfer type thermal printing sheet of the present invention comprises(a) a substrate, and(b) a lamina comprisinga dye andeither a cured product of a moisture curing type resin or a reaction-cured product of a moisture curing type resin and a reactive silicone oil,on at least one side of the substrate.According to the present invention, a surface release property and surface lubricity can easily be imparted to the color material layer or to the surface layer. Further, since no crosslinking agent is required to cure the resin, curing at low temperature becomes possible. The dye transfer type thermal printing sheet of the present invention can provide a printing sheet useful for high speed recording and/or relative speed recording.Type: GrantFiled: April 5, 1990Date of Patent: November 5, 1991Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akihiro Imai, Tetsuji Kawakami, Hiromu Matsuda, Keiichi Yubakami, Nobuyoshi Taguchi
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Patent number: 5043318Abstract: The present invention provides dye transfer type thermal printing sheet comprising a base sheet, a dye-containing layer formed on the base sheet and a dye-permeable layer which is formed on the dye-containing layer and comprises at least one water dispersible polysiloxane graft polymer which is obtainable by polymerizing (B) 0.05 to 10% by weight of a polymerizable silane compound, (C) 1 to 30% by weight of an unsaturated organic acid and (D) 40 to 97.95% by weight of a monomer which is copolymerizable with the silane compound (B) and the unsaturaed organic acid (C) in the presence of (A) 1 to 20% by weight of a polysiloxane having terminal hydroxyl groups (provided that the total of the components (A), (B), (C) and (D) is 100% by weight) in an organic solvent except an alcohol or at least one salt of said graft polymer with a base, which has good storage stability, generates images with improve weather durability and prevents great decrease of print density as increase of the number of printing times.Type: GrantFiled: March 12, 1990Date of Patent: August 27, 1991Assignees: Matsushita Electric Industrial Co., Ltd., Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Tetsuji Kawakami, Hiromu Matsuda, Sigeru Tanimori, Yoshinori Sano
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Patent number: 5028582Abstract: When a dyeable layer comprises cured product of at least one moisture-curable type resin, it can have a high image reliability, permit easy control of the printing sensitivity and serve for both low-speed printing and high-speed printing. A receiving sheet having a dyeable layer excellent in surface slipperiness which is useful for high-speed printing and/or relative-speeds printing, can be obtained when the dyeable layer comprises cured product of a moisture-curable type resin, or reaction cured product of a moisture-curable type resin with a reactive silicone oil.Type: GrantFiled: April 4, 1989Date of Patent: July 2, 1991Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akihiro Imai, Tetsuji Kawakami, Hiromu Matsuda, Keiichi Yubakami, Nobuyoshi Taguchi
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Patent number: 4985396Abstract: The present invention provides a dye transfer type thermal printing sheet which can give a color record image excellent in color reproducibility and weather resistance with middle shade including black and sufficiently saturated density. This printing sheet comprising a substrate on which are arranged, in face-sequence, coloring material layers which are different in hue and contain either of at least one dye represented by the formula (I), at least one dye represented by the formual (II) and at least one dye represented by the formulas (III)-(VI).Type: GrantFiled: December 22, 1988Date of Patent: January 15, 1991Assignees: Matsushita Electric Industrial Co., Ltd, Mitsubishi Kasei CorporationInventors: Tetsuji Kawakami, Akihiro Imai, Nobuyoshi Taguchi, Yukichi Murata, Takao Hirota