Patents Assigned to AG Technology Co., Ltd.
-
Patent number: 6042749Abstract: A mixed solvent composition comprising dichloropentafluoropropane and at least one component selected from the group consisting of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and perfluorohexane as the essential components, or a mixed solvent composition comprising dichloropentafluoropropane, an alcohol and at least one component selected from the group consisting of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and perfluorohexane.Type: GrantFiled: June 5, 1998Date of Patent: March 28, 2000Assignee: AG Technology Co., Ltd.Inventors: Kenroh Kitamura, Michino Ikehata, Masaaki Tsuzaki
-
Patent number: 6017466Abstract: A liquid crystal optical element comprising a pair of substrates with electrodes and a liquid crystal/polymer composite material interposed between the pair of substrates wherein polymer which constitutes a polymer phase has a maximum value of 20.degree. C. or less in the temperature dependence of the loss dielectric constant (a frequency for measurement=100 Hz).Type: GrantFiled: June 28, 1996Date of Patent: January 25, 2000Assignee: AG Technology Co., Ltd.Inventors: Yohsuke Fujino, Satoshi Niiyama, Yoshinori Hirai
-
Patent number: 5926352Abstract: A magnetic disk comprises a glass substrate and a magnetic layer formed on the glass substrate wherein the maximum deflection of a bent portion in the radial direction of the magnetic disk with respect to a reference length of 2 mm is 1,500 .ANG. or less in the entire region of a surface of the disk excluding annular areas having a width of 250 .mu.m which are respectively formed inwardly from annular lines at which chamfered portions formed at the inner and outer peripheries of the magnetic disk and the disk surface intersect.Type: GrantFiled: November 23, 1993Date of Patent: July 20, 1999Assignee: AG Technology Co., Ltd.Inventors: Yuzo Murayama, Naohiko Ishimaru
-
Patent number: 5900296Abstract: A glass substrate for magnetic disks, obtained by chemical strengthening treatment of a glass consisting essentially of from 50 to 65 wt % of SiO.sub.2, from 5 to 15 wt % of Al.sub.2 O.sub.3, from 2 to 7 wt % of Na.sub.2 O, from 4 to 9 wt % of K.sub.2 O, from 7 to 14 wt % of Na.sub.2 O+K.sub.2 O, from 12 to 25 wt % of MgO+CaO+SrO+BaO, and from 1 to 6 wt % of ZrO.sub.2.Type: GrantFiled: April 18, 1996Date of Patent: May 4, 1999Assignee: AG Technology Co., Ltd.Inventors: Ichiro Hayashi, Kei Maeda, Kazuo Mannami
-
Patent number: 5871654Abstract: To reduce occurrence of flaws in a polishing process by preventing an abrasive grain or metallic particles deposited on the surface of a glass substrate for a magnetic disk in a lapping process from entering into the subsequent polishing process. A lapping process for the main surface is a glass substrate for a magnetic disk is conducted; an etching process for the main surface of the glass substrate is conducted to the extent of a depth of 0.1 .mu.m to 3 .mu.m, followed by conducting a polishing process for the main surface of the glass substrate where the etching process has been conducted.Type: GrantFiled: December 2, 1996Date of Patent: February 16, 1999Assignee: AG Technology Co., Ltd.Inventors: Kazuo Mannami, Ichiro Hayashi, Atsushi Tokuma
-
Patent number: 5858268Abstract: A liquid crystal optical element comprising a pair of substrates with electrodes and a liquid crystal/polymer composite material which is composed of a liquid crystal and a polymer and interposed between the pair of substrates, wherein the polymer phase of the liquid crystal/polymer composite material is a polymeric cured product of a polymerizable curable material comprising an addition-polymerizable compound presented by the following formula (1):CXY=CZ--CO--O--R--OH (1)wherein each of X, Y and Z is --H or --CH.sub.3, and R is a bivalent hydrocarbon group which has 4 to 8 carbon atoms in total and at least one carbon atom between the carbon atom bonded to the ester linkage and the carbon atom bonded to the hydroxyl group in the formula (1), and may have at least one linkage selected from the group consisting of an ether linkage, an ester linkage and a carbonate linkage, substituted for one or more carbon--carbon linkages.Type: GrantFiled: June 27, 1996Date of Patent: January 12, 1999Assignee: AG Technology Co., Ltd.Inventors: Satoshi Niiyama, Hiroshi Kumai
-
Patent number: 5844638Abstract: A projection type display apparatus comprising a light source apparatus which is provided with an elliptic mirror 12, a light source 11 disposed at the first focal point, a cone-like material disposed at the second focal point, a condenser lens 13, display elements 15R-15B, a color separating and synthesizing optical system, second condenser lenses 16R-16B and a projection lens 19. The cone-like material is one selected from the group of a convex cone lens, a concave cone lens 2, a convex cone-like reflector and a concave cone-like reflector 20. In the projection type display element, light emitted from the light source is introduced into the cone-like material and is emitted as divergent light through the conical surface of the cone-like material.Type: GrantFiled: January 10, 1997Date of Patent: December 1, 1998Assignee: AG Technology Co., Ltd.Inventors: Yoshiharu Ooi, Tsuneo Wakabayashi, Shigeyuki Serizawa, Yoshiyuki Sonda
-
Patent number: 5827454Abstract: A mixed solvent composition, for cleaning electronic components, which consists essentially of dichloropentafluoropropane and 1,1,1,2,3,4,4,5,5,5-decafluoropentane.Type: GrantFiled: January 18, 1996Date of Patent: October 27, 1998Assignee: AG Technology Co., Ltd.Inventors: Kitamura Kenroh, Ikehata Michino, Tsuzaki Masaaki
-
Patent number: 5808318Abstract: A polycrystalline semiconductor thin film formed in a stripe shape on an insulating substrate wherein crystal particles are arranged in a line-texture form in a longitudinal direction of a stripe; an electric field effect mobility .nu..sub.L in a longitudinal direction of a stripe is different from an electric field effect mobility .nu..sub.S in a width direction of the stripe, and .nu..sub.L .gtoreq.1.5.multidot..nu..sub.S is satisfied.Type: GrantFiled: March 28, 1997Date of Patent: September 15, 1998Assignee: AG Technology Co., Ltd.Inventors: Kunio Masumo, Masaya Kunigita
-
Patent number: 5798805Abstract: A projection type display apparatus has a light source optical system, a first filter (1), a first aperture (17), a condenser lens (13), a liquid crystal element (15) having a color filter for each pixel, a second aperture (18), a second filter (2), a projection optical system which form a schlieren optical system wherein first and second filters each composed of a spectral element for controlling each color of R, G and B are provided.Type: GrantFiled: December 20, 1995Date of Patent: August 25, 1998Assignee: AG Technology Co., Ltd.Inventors: Yoshiharu Ooi, Tsuneo Wakabayashi
-
Patent number: 5789763Abstract: A substrate for a display device wherein a plurality of row electrode lines and a plurality of column electrode lines are arranged in a matrix form on a substrate; pixel electrodes and pixel-drive-TFTs each having a polycrystalline semiconductor channel are provided so as to correspond to each intersection of the row electrode lines and the column electrode lines; the pixel-drive-TFTs are arranged in a line-like form in the direction of row electrode line; row signals are supplied through the row electrode lines to the pixel-drive-TFTs; and column signals are supplied through the column electrode lines to the pixel-drive-TFTs; a plurality of row driver circuits for supplying row signals are formed on the substrate so as to correspond to each of the row electrode lines; each of the row driver circuits has row-drive-TFTs; the row-drive-TFT has a polycrystalline semiconductor channel; and the row-drive-TFT is arranged in a line-like form in the direction of row electrode line with respect to the pixel-drive-TFTsType: GrantFiled: September 16, 1996Date of Patent: August 4, 1998Assignee: AG Technology Co., Ltd.Inventors: Naoki Kato, Masaya Kunigita
-
Patent number: 5776364Abstract: To a bifunctional acrylurethane compound having acrylate groups at its both ends, which is a reaction product of polypropylene glycol, a mixture of 2,2,4-trimethyl-1, 6-diisocyanatohexane and 2,4,4-trimethy1-1, 6-diisocyanatohexane, and 2-hydroxyethyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, nematic liquid crystal and a photo-reaction initiator are mixed to obtain a uniformly dissolved mixture, and the mixture undergoes a phase separation treatment by photopolymerization to thereby form a liquid crystal/polymer composite material layer 7 which is utilized for a liquid crystal optical element 1. The phase separation by photo-polymerization improves controllability of the structure of the liquid crystal/polymer composite material layer.Type: GrantFiled: April 24, 1996Date of Patent: July 7, 1998Assignee: AG Technology Co., Ltd.Inventors: Satoshi Niiyama, Kazuhiko Yamada, Hiroshi Kumai
-
Patent number: 5754260Abstract: A light source optical system for projection 1, dichroic mirrors 21, 22 disposed to have a predetermined included angle .beta., a reflection type liquid crystal optical element blocks 31-33 each including a closely contacted converging lens and having a reflection surface and a projection optical system 4 are provided, wherein the normal line of a dichroic mirror surface and the optical axis of incident light form an included angle .alpha.; the normal line of the reflection surface and the optical axis of incident light form an included angle .gamma.; light emitted from a light source is color-separated so as to become color lights; the color lights are rendered to be parallel light beams, and are modulated and reflected by means of the reflection type liquid crystal optical elements; the reflected light beams are color-synthesized; and the color-synthesized light is projected through a projection lens.Type: GrantFiled: February 27, 1997Date of Patent: May 19, 1998Assignee: AG Technology Co., Ltd.Inventors: Yoshiharu Ooi, Tsuneo Wakabayashi, Shigeyuki Serizawa, Yoshiyuki Sonda, Masaya Kunigita, Yoshinori Hirai
-
Patent number: 5738906Abstract: A method for producing a magnetic disk having a surface roughness in the entire portion of its main surface in which the peak height of the surface roughness in a data zone of the magnetic disk is lower than the peak height of the surface roughness in a CSS zone of the magnetic disk, wherein forming a magnetic disk substrate having the main surface in which a surface roughness having a substantially uniform peak height is formed in the substantially entire portion of the main surface; conducting varnishing only to the data zone in the main surface of the substrate having the surface roughness to lower the peak height of the surface roughness of the data zone; and forming a ferromagnetic layer, a protective layer and a lubricant layer sequentially on a region of the main surface of the substrate, which includes the data zone and the CSS zone.Type: GrantFiled: March 27, 1996Date of Patent: April 14, 1998Assignee: AG Technology Co., Ltd.Inventors: Toru Momose, Tsuneo Manabe, Yuzo Murayama, Yoshizumi Hideshima
-
Patent number: 5663543Abstract: A method for producing a polyfluoropropionyl halide, which is characterized by oxidizing at least one dichloropentafluoropropane selected from 3,3-dichloro-1,1,1,2,2-pentafluoropropane and 1,3-dichloro-1,1,2,2,3-pentafluoropropane by oxygen under irradiation with light and in the presence of chlorine.The polyfluoropropionyl halide can be obtained from the dichloropentafluoropropane industrially advantageously in good yield. Further, in a gas phase reaction, the polyfluoropropionyl halide can be obtained in a very high reaction yield without decomposition of the desired product and without corrosion of the material for the reactor or the glass for the light source portion even in a reaction for a long period of time.Type: GrantFiled: May 1, 1995Date of Patent: September 2, 1997Assignee: AG Technology Co., Ltd.Inventors: Shinsuke Morikawa, Hidekazu Okamoto, Keiichi Ohnishi, Toru Shimoyama, Naoko Wada, Yoshio Sato, Hideyuki Kurata
-
Patent number: 5659409Abstract: A projection type display apparatus comprising a light source apparatus which is provided with an elliptic mirror 12, a light source 11 disposed at the first focal point, a cone-like material disposed at the second focal point, a condenser lens 13, display elements 15R-15B, a color separating and synthesizing optical system, second condenser lenses 16R-16B and a projection lens 19. The cone-like material is one selected from the group of a convex cone lens, a concave cone lens 2, a convex cone-like reflector and a concave cone-like reflector 20. In the projection type display element, light emitted from the light source is introduced into the cone-like material and is emitted as divergent light through the conical surface of the cone-like material.Type: GrantFiled: October 7, 1993Date of Patent: August 19, 1997Assignee: AG Technology Co., Ltd.Inventors: Yoshiharu Ooi, Tsuneo Wakabayashi, Shigeyuki Serizawa, Yoshiyuki Sonda
-
Patent number: 5648860Abstract: A light source optical system for projection 1, dichroic mirrors 21, 22 disposed to have a predetermined included angle .beta., a reflection type liquid crystal optical element blocks 31-33 each including a closely contacted converging lens and having a reflection surface and a projection optical system 4 are provided, wherein the normal line of a dichroic mirror surface and the optical axis of incident light form an included angle .alpha.; the normal line of the reflection surface and the optical axis of incident light form an included angle .gamma.; light emitted from a light source is color-separated so as to become color lights; the color lights are rendered to be parallel light beams, and are modulated and reflected by means of the reflection type liquid crystal optical elements; the reflected light beams are color-synthesized; and the color-synthesized light is projected through a projection lens.Type: GrantFiled: February 18, 1994Date of Patent: July 15, 1997Assignee: AG Technology Co., Ltd.Inventors: Yoshiharu Ooi, Tsuneo Wakabayashi, Shigeyuki Serizawa, Yoshiyuki Sonda, Masaya Kunigita, Yoshinori Hirai
-
Patent number: 5648325Abstract: An azeotropic composition consisting of 89.2 wt % of 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane and 10.8 wt % of methanol and an azeotropic composition consisting of 91.1 wt % of 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane and 8.9 wt % of ethanol.The present invention provides alternative azeotropic solvent compositions which have excellent properties of conventional 1,1,2-trichloro-l,2,2-trifluoroethane and do not deplete the stratospheric ozone layer.Type: GrantFiled: June 9, 1995Date of Patent: July 15, 1997Assignee: AG Technology Co., Ltd.Inventors: Kenroh Kitamura, Michino Ikehata, Masaaki Tsuzaki, Kazuya Oharu
-
Patent number: 5637380Abstract: A composition for a protective film, which comprises the following components (A), (B), (C) and (D), wherein the proportions of the main components (A) and (B) are substantially from 5 to 60 wt % of (A) and from 35 to 90 wt % of (B), based on the total amount of the composition: (A) a photopolymerizable polyfunctional (meth)acrylate monomer and/or oligomer; (B) an oligomer or polymer of a non-acrylic epoxide; (C) a photopolymerization initiator; and (D) an epoxy-curing agent.Type: GrantFiled: May 12, 1995Date of Patent: June 10, 1997Assignee: AG Technology Co., Ltd.Inventors: Atsuko Kaneko, Shinya Tahara
-
Patent number: 5608126Abstract: A process for preparing 1,1,1,3,3-pentafluoropropane, which comprises reacting 1,1-difluoroethylene with dichlorofluoromethane in the presence of a Lewis acid catalyst to form 1,2,2-trihydrodichlorotrifluoropropane and fluorinating the 1,2,2-trihydrodichlorotrifluoropropane with hydrogen fluoride.Type: GrantFiled: June 23, 1995Date of Patent: March 4, 1997Assignee: AG Technology Co., Ltd.Inventors: Shinsuke Morikawa, Hidekazu Okamoto, Keiichi Ohnishi, Shin Tatematsu