Patents by Inventor Isamu Michihata

Isamu Michihata 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: 6652926
    Abstract: A film for a liquid crystal display. The film is a cellulose ester film with a thickness between 20 and 65 &mgr;m and containing fine particles. The average diameter of fine particles is 0.005 to 3.0 &mgr;m. The number of fine particles per 1,000 &mgr;m2 is 5 to 500 in the cross-section perpendicular to the cellulose ester film in a region of a depth of not more than 10 &mgr;m.
    Type: Grant
    Filed: October 16, 2000
    Date of Patent: November 25, 2003
    Assignee: Konica Corporation
    Inventors: Masahito Takada, Isamu Michihata, Kouichi Saito, Hiroko Yokouchi, Noriki Tachibana
  • Publication number: 20020102368
    Abstract: A cellulose ester film comprises (a) an ultraviolet absorbent polymer having at least one of repeating units represented by formulae (1) and (2) and repeating units having ultraviolet absorbent structures represented by formulae (3), (4) and (5), (b) an ultraviolet absorbent polymer which is a copolymer of a repeating unit represented by the following formula (6), (7) or (19) with a monomer unit derived from another ethylenically unsaturated monomer, (c) an ultraviolet absorbent polymer which is a copolymer of a monomer represented by formula (8) with a monomer represented by formula (9), or (d) modified cellulose in which an ultraviolet absorbent structure bonds directly or through a spacer to a hydroxy group of cellulose or its derivative.
    Type: Application
    Filed: May 8, 2001
    Publication date: August 1, 2002
    Applicant: Konica Corporation
    Inventors: Kaori Ono, Isamu Michihata, Osamu Ishige
  • Patent number: 6320042
    Abstract: A cellulose triacetate film characterized in being comprised of cellulose triacetate which is prepared by employing cotton liter as the raw material, having a value of weight average molecular weight Mw/number average molecular weight Mn of 3.5 to 4.5, or being comprised of cellulose triacetate which is prepared by employing wood pulp as the raw material, having a value of weight average molecular weight Mw/number average molecular weight Mn of 4.0 to 5.0.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: November 20, 2001
    Assignee: Konica Corporation
    Inventors: Isamu Michihata, Masahito Takada, Kunio Shimizu, Koichi Nagayasu, Noriki Tachibana
  • Patent number: 6055096
    Abstract: A protective film of a polarizing plate is disclosed which is made of a resin film containing a UV absorbent and has a change in linear dimensions of -0.06 to 0.06%.
    Type: Grant
    Filed: November 29, 1996
    Date of Patent: April 25, 2000
    Assignee: Konica Corporation
    Inventors: Isamu Michihata, Koichi Nagayasu, Toru Kobayashi, Chie Kanbe
  • Patent number: 6008940
    Abstract: A protective film for use with a polarizing plate has a support carrying a glare-proof layer. The glare-proof layer is a resin with coarse particles having an average particle size of 0.25 to 10 .mu.m, and fine particles having an average particle size of 0.1 .mu.m or less and a refractive index of 1.40 to 1.60, embedded in it.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: December 28, 1999
    Assignee: Konica Corporation
    Inventors: Isamu Michihata, Koichi Nagayasu, Toru Kobayashi, Masaji Nara
  • Patent number: 5914073
    Abstract: A protective film for a polarizing plate comprises a resin film, and provided thereon, a layer comprising a polyol acrylate resin.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: June 22, 1999
    Assignee: Konica Corporation
    Inventors: Toru Kobayashi, Naoko Morita, Koichi Nagayasu, Isamu Michihata, Masaji Nara
  • Patent number: 5635294
    Abstract: A magnetic recording medium and a manufacturing process thereof are disclosed. The medium comprises a magnetic layer containing a binder, chromium oxide having an average particle size within the range of 0.3 to 0.5 .mu.m and a metal magnetic powder, wherein the binder comprises a polyurethane resin having a polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM, --PO (OM), and --OPO(OM).sub.2 wherein M represents a hydrogen atom or an alkali metal.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: June 3, 1997
    Assignee: Konica Corporation
    Inventors: Isamu Michihata, Hideki Murata, Katsuyuki Takeda, Nobuyuki Sekiguchi, Syozo Kikugawa
  • Patent number: 5382494
    Abstract: A silver halide photographic light-sensitive material which comprises a backing layer containing inorganic particles is disclosed. The photographic material is exelent in curl-balance suitable for transporting during the processing with automatic processing machine. The photographic material may also comprise a magnetic recording layer on the backing layer so that it is allowed to use as magnetic recording.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: January 17, 1995
    Assignee: Konica Corporation
    Inventors: Ichiro Kudo, Isamu Michihata, Yasuo Kurachi