Patents by Inventor Akio Mukoh

Akio Mukoh 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).

  • Patent number: 5707749
    Abstract: A thin film multilayer wiring material excellent in reliability, yield, productivity, and higher positioning accuracy includes an insulation organic film having a wiring pattern on one surface and an adhesive layer on another principal surface. The insulation organic film is a polyimide film having a heat resistance at a pyrolysis beginning temperature of 350.degree. to 550.degree. C., a dielectric constant of 3.5-2.2 and a flame retardance of V-0 or V-1 according to the UL-94 standard. The adhesive layer contains an ether bismaleimide compound.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: January 13, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Junichi Katagiri, Akio Takahashi, Akira Nagai, Haruo Akahoshi, Kouji Fujisaki, Akio Mukoh, Fumiyuki Kobayashi
  • Patent number: 5565536
    Abstract: A polymerzable compound represented by the general formula (1) X--R.sub.1 --Y where X is an unsaturated imide group having substituents R.sub.2 and R.sub.3, or an itacon imide group where R.sub.2 and R.sub.3 are selected from the group consisting of hydrogen, a lower alkyl group and an aromatic group having a substituent p which is hydrogen, a lower alkyl group, or an alkoxy group, and Y is a styryl group, and R.sub.1 is a divalent organic group.The polymerizable compounds is excellent in formability, and find a wide variety of applications because they have functional groups different in reactivity from each other and hence allow the curing conditions to control. The cured polymers are excellent in thermal durability, mechanical properties and electrical properties, making it possible to achieve higher performance, higher reliability, highly compact and lower weight of electric apparatuses and electronic parts.
    Type: Grant
    Filed: April 18, 1995
    Date of Patent: October 15, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Shin Nishimura, Yoshinori Kawai, Satoru Amou, Akira Nagai, Masahiro Suzuki, Akio Takahashi, Akio Mukoh
  • Patent number: 5538942
    Abstract: A superconducting magnet coil is produced by winding a superconducting wire to form a coil; impregnating the coil with a curable resin composition of low viscosity which contains for example at least one epoxy resin selected from the group consisting of diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F and diglycidyl ether of bisphenol AF, all having a number-average molecular weight of 350-1,000, a flexibilizer and a curing catalyst, to obtain a curable-resin composition-impregnated coil; and heating the curable-resin-composition-impregnated coil to cure the composition.
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: July 23, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Toru Koyama, Koo Honjo, Masao Suzuki, Akio Takahashi, Akio Mukoh, Keiji Fukushi, Seiji Numata
  • Patent number: 5484685
    Abstract: A naphthalocyanine derivative of the formula: ##STR1## wherein M, Y, R.sup.1, k, l, m, n are as defined in the specification, is an effective substance for forming a recording layer on a substrate of an optical recording medium having high sensitivity with good properties.
    Type: Grant
    Filed: May 30, 1991
    Date of Patent: January 16, 1996
    Assignees: Hitachi, Ltd., Hitachi Chemical Co., Ltd.
    Inventors: Seiji Tai, Nobuyuki Hayashi, Koichi Kamijima, Mitsuo Katayose, Takayuki Akimoto, Shigeru Hayashida, Hideo Hagiwara, Susumu Era, Setsuo Kobayashi, Akio Mukoh
  • Patent number: 5410069
    Abstract: A polymerzable compound represented by the general formula (1) X--R.sub.1 --Y where X is un unsaturated imide group having substituents R.sub.2 and R.sub.3, or an itacon imide group where R.sub.2 and R.sub.3 are selected from the group consisting of hydrogen, a lower alkyl group and an aromatic group having a substituent p which is hydrogen, a lower alkyl group, or an alkoxy group, and Y is a styryl group, and R.sub.1 is a divalent organic group.The polymerizable compounds is excellent in formability, and find a wide variety of applications because they have functional groups different in reactivity from each other and hence allow the curing conditions to control. The cured polymers are excellent in thermal durability, mechanical properties and electrical properties, making it possible to achieve higher performance, higher reliability, highly compact and lower weight of electric apparatuses and electronic parts.
    Type: Grant
    Filed: December 8, 1992
    Date of Patent: April 25, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Shin Nishimura, Yoshinori Kawai, Satoru Amou, Akira Nagai, Masahiro Suzuki, Akio Takahashi, Akio Mukoh
  • Patent number: 5393805
    Abstract: An epoxy resin composition for insulating a coil which comprises at least one polyfunctional epoxy resin, at least one latent curing catalyst, at least one filler and at least one surfactant, wherein the ceiling is set to the acid anhydride content in the composition at 10% by weight based on the weight of the epoxy resin; and a coil molded out of said resin composition.
    Type: Grant
    Filed: June 19, 1991
    Date of Patent: February 28, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Toru Koyama, Hirokazu Takasaki, Hiroshi Suzuki, Akio Mukoh, Ikushi Kano, Toshiyuki Koide
  • Patent number: 5384197
    Abstract: A superconducting magnet coil contains a coil of superconducting wire and a cured product of a curable resin composition with which the coil has been impregnated, the cured product having a thermal shrinkage factor of 1.5-0.3%, preferably 1.0-0.3%, when cooled from the glass transition temperature to 4.2K, a bend-breaking strain of 2.9-3.9%, preferably 3.2-3.9%, at 4.2K and a modulus of 500-1,000 kg/mm.sup.2 at 4.2K, or undergoing a thermal stress of 0-10 kg/mm.sup.2 when cooled from the glass transition temperature to 4.2K and resisting to quench during superconducting operation.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: January 24, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Toru Koyama, Koo Honjo, Masao Suzuki, Akio Takahashi, Akio Mukoh, Keiji Fukushi, Seiji Numata
  • Patent number: 5356698
    Abstract: Adhesive agent for substrate of electroless plating characterized in comprising epoxy resin, synthetic rubber, and phenolic resin as main components, a hardener of the epoxy resin, inorganic filler having hydroxyl group, and solvent.The adhesive agent is hardened at relatively low temperature (about 150.degree. C.) in short period (within 30 minutes) without giving warp and distortion to the insulation substrate, and moreover its insulation resistance after hardening is high.The adhesive agent is preferable as an adhesive agent for a printed circuit board.
    Type: Grant
    Filed: January 5, 1993
    Date of Patent: October 18, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Mineo Kawamoto, Haruo Akahoshi, Akio Takahashi, Akio Mukoh, Kazuo Tanje, Toyofusa Yoshimura, Tokihito Suwa, Iwao Kaminaga, Toshiyuki Chida
  • Patent number: 5352762
    Abstract: A multilayer printed circuit board comprising a plurality of alternately laminated layers of insulating layers and circuit conductor layers having a signal transmission delay time of 6.0 ns/m or less, excellent in heat resistance, adhesive, fire retardance, etc. can be produced by forming insulating layers using a fluorine-containing thermosetting resin composition.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: October 4, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Akira Nagai, Shin Nishimura, Masahiro Suzuki, Masao Suzuki, Junichi Katagiri, Akio Takahashi, Akio Mukoh
  • Patent number: 5350886
    Abstract: An LSI mounting substrate having a multilayered thin film wiring portion, with the thin film wiring portion being divided into wiring units each composed of a plurality of wiring layers, with the wirings between the units being electrically connected through connecting pads defined in the same surface as that of a surface conductive layer of the unit.
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: September 27, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Kunio Miyazaki, Yutaka Sugita, Akio Mukoh, Tadahiko Miyoshi, Osamu Miura, Akio Takahashi, Shunichi Numata, Satoru Ogihara, Kazuji Yamada, Hirokazu Inoue, Fumiyuki Kobayashi
  • Patent number: 5324767
    Abstract: A thermoplastic resin composition for casting high-voltage coils containing two kinds of fillers (A) and (B), and products as molded coils and panels obtained by casting and curing the composition.The composition of the present invention contains 60%-85% by weight, based on the total weight of the composition, of a silica type filler which is an admixture (A) a spherical silica having an average particle diameter of 0.1-0.9 .mu.m and (B) a ground silica having an average particle diameter of 3-9 .mu., the ratio A/(A+B) being 1%-7% by weight.Products as molded coils and panels prepared by using the composition have good resistance to cracking and resistance to moisture.
    Type: Grant
    Filed: May 22, 1992
    Date of Patent: June 28, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Tohru Koyama, Hirokazu Takasaki, Hiroshi Suzuki, Shigeo Amagi, Akio Mukoh, Ikushi Kano
  • Patent number: 5322760
    Abstract: A nonlinear optical element comprising a tetraazaporphyrin compound represented by the formula (I): ##STR1## This nonlinear optical element is excellent in that it is improved over low switching speed of the conventional inorganic materials and over small nonlinearity and poor chemical and physical stability and workability of the conventional organic materials.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: June 21, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Yuzo Itoh, Atsushi Kakuta, Akio Mukoh
  • Patent number: 5219706
    Abstract: There are disclosed a novel naphthalocyanine derivative represented by the general formula [I] or [II] shown below, a process for preparing said derivative, an optical information recording medium using said derivative, and a process for preparing thereof: ##STR1## wherein M is a metal, metal oxide, metal hydroxide and the like, R.sup.1 is an alkyl group of 1-22 carbon atoms, n is an integer of 1 to 4, and Y.sub.1 and Y.sub.2 aryloxy group and the like.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: June 15, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Seiji Tai, Shigeru Hayashida, Nobuyuki Hayashi, Yasushi Iwakabe, Shunichi Numata, Noriyuki Kinjo, Susumu Era, Setsuo Kobayashi, Akio Mukoh, Yoshio Sato
  • Patent number: 5220447
    Abstract: A liquid crystal display device comprising: a liquid crystal display element formed by holding, between two substrates at least one of which has a light-permeable electrode, a liquid crystal layer in which liquid crystal molecules of a nematic liquid crystal having positive dielectric anisotropy and containing an optically active substance has a helical axis perpendicular to the substrates between the substrates and are helically oriented, and the liquid crystal molecules between the substrates have a twist angle of 180 to 270 degrees, and a phase plate formed by stacking water surface development films of an organic polymer with changing the orientation axes thereof at a constant angle, wherein the contrast ratio, a ratio between brightness in white display and brightness in black display, is remarkably excellent over that of a device obtained by stacking plastic films, and the transmissivity, a quotient of background brightness and light source brightness, is equivalent to that of a conventional double laye
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: June 15, 1993
    Assignees: Hitachi, Ltd., Denko Corporation
    Inventors: Hisao Yokokura, Teruo Kitamura, Akio Mukoh, Junichi Hirakata, Yasuhiko Kando, Isoji Sakai, Yasuo Fujimura, Noboru Masutani
  • Patent number: 5214188
    Abstract: 2,3-dicyanonaphthalene derivatives useful in the synthesis of naphthalocyanine derivatives are disclosed. The 2,3-dicyanonaphthalene derivatives have the formula: ##STR1## wherein each R.sup.1 may be the same or different and represents an alkyl group, substituted alkyl group, or aryl group; and n is an integer from 1 to 4.
    Type: Grant
    Filed: May 2, 1991
    Date of Patent: May 25, 1993
    Assignees: Hitachi, Ltd., Hitachi Chemical Company, Ltd.
    Inventors: Seiji Tai, Shigeru Hayashida, Nobuyuki Hayashi, Hideo Hagiwara, Mitsuo Katayose, Koichi Kamijima, Takayuki Akimoto, Susumu Era, Setsuo Kobayashi, Akio Mukoh
  • Patent number: 5167863
    Abstract: There are disclosed an optically active compound represented by the general formula: ##STR1## wherein n, R.sub.1, R.sub.2, R.sub.3, R.sub.4, Q.sub.1, Q.sub.2, Q.sub.3, and M are defined as in the detailed explanation, and *-marked carbon atoms are each an asymmetric carbon atom; a liquid crystal composition comprising at least one optically active compound of said general formula and a liquid crystal optical modulator using the composition thereof.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: December 1, 1992
    Assignees: Hitachi, Ltd., Takeda Chemical Industries, Ltd.
    Inventors: Teruo Kitamura, Katsumi Kondo, Akio Mukoh, Koichi Matsumura, Mitsuru Kawada, Yoshihiro Sugihara
  • Patent number: 5157066
    Abstract: A solid surface modifying composition comprising a film forming material and a fluoroalkyl ether ((Rf).sub.m (CONH--X--NHCO--Y).sub.m (m=1 or 2; Rf: perfluoropolyether chain; X: ##STR1## etc.; ##STR2## etc.) provides surfaces with such improvements as durable water and oil repellency, lubricity and lowered surface energy. The lubricating protective coating is applicable for coatings of recording mediums, photoreceptors and wirings.
    Type: Grant
    Filed: July 2, 1991
    Date of Patent: October 20, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Mitsuyoshi Shoji, Takayuki Nakakawaji, Yutaka Ito, Shigeki Komatsuzaki, Akio Mukoh
  • Patent number: 5067797
    Abstract: A liquid crystal display cell, wherein orientation films are made of an organic polymer such as polyimide, polyamide, liquid crystal polymer having one or more mesogen groups in a main chain or side chain and produced by spreading an organic polymer solution on a water surface, is excellent in memory properties and contrast and generates no static electricity, no short circuit between electrodes and no breaking of electrodes.
    Type: Grant
    Filed: March 21, 1989
    Date of Patent: November 26, 1991
    Assignees: Hitachi, Ltd., Nitto Denko Corporation
    Inventors: Hisao Yokokura, Tadao Nakada, Teruo Kitamura, Akio Mukoh, Yasuhiko Kando, Isoji Sakai, Yasuo Fujimura, Noboru Masutani, Tsunetaka Matsumoto, Yasuo Imanishi
  • Patent number: 5034309
    Abstract: Novel naphthalocyanine derivatives are disclosed in the specification are useful for forming a recording layer in an optical recording medium. These derivatives are represented by the following formula (I): ##STR1## in which k, l, m and n, which may be the same or different, are zero or integers of 1 to 4, k+l+m+n being an integer of 1 or more; R.sup.1 's in a number of (k+l+m+n), which may be the same or different, are alkyl groups, substituted alkyl groups, or aryl groups; M is Si, Ge or Sn; and two Y's, which may be the same or different, are aryloxyl groups, alkoxyl groups, trialkylsiloxyl groups, triarylsiloxyl groups, trialkoxysiloxyl groups, triaryloxysiloxyl groups, trityloxyl groups, or acyloxyl groups. These derivatives are especially useful in the preparation of an optical recording medium.
    Type: Grant
    Filed: June 24, 1988
    Date of Patent: July 23, 1991
    Assignees: Hitachi Chemical Co., Ltd., Hitachi, Ltd.
    Inventors: Seiji Tai, Shigeru Hayashida, Nobuyuki Hayashi, Hideo Hagiwara, Mitsuo Katayose, Koichi Kamijima, Takayuki Akimoto, Susumu Era, Setsuo Kobayashi, Akio Mukoh
  • Patent number: RE34885
    Abstract: A liquid crystal display element comprising a pair of substrates, a pair of electrodes provided on the respective substrates, at least one of which is transparent and a liquid crystal layer disposed between said substrates, the liquid crystal layer comprising a nematic liquid crystal, which exhibits a positive dielectric constant anisotropy and contains an optically active substance, the liquid crystal moleccule orientation direction in the liquid crystal layer is twisted in the range of 200.degree. to 250.degree. from the one substrate surface toward the other substrate surface so as to form a helical structure therein. A polyimide orientation film is provided between the electrodes and the liquid crystal layer. The polyimide orientation film is one made of a polyimide prepared by reacting a diamine compound having a long-chain hydrocarbon group or a diamine compound having a trifluoromethyl group with a tetracarboxylic dianhydride and causes a pretilt angle of at least 3.degree.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: March 28, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Hisao Yokokura, Tadao Nakata, Susumu Era, Yasuo Hanawa, Kishiro Iwasaki, Teruo Kitamura, Akio Mukoh, Toshikazu Narahara, Yasuhiko Kando, Shunichi Numata, Kooji Fujisaki