Patents by Inventor Yasuzo Murata

Yasuzo Murata 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: 5609432
    Abstract: A ballpoint pen contains an aqueous ink composition into which ink is directly filled. The pen is free from ink dripping and has improved writing performance. The aqueous ink composition is directly filled into an ink reservoir tube equipped with a ballpoint pen tip. The aqueous ink composition includes (a) an aqueous medium, (b) a pigment and (c) a carboxyl group-containing crosslinked hydrophilic polymer. The hydrophilic polymer swells and disperses in a gel state in the form of particles having a particle diameter of 0.5 to 10 .mu.m. The polymer is crosslinked with a crosslinkable monomer having at least two polymerizable unsaturated groups in an amount of 0.5 mol % or more based on the total of a carboxyl group-containing monomer and a copolymerizable monoethylenic monomer used together, if desired. The ink reservoir tube tip has a clearance between a ball and a ball receiver in the range of 10 to 40 .mu.m.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: March 11, 1997
    Assignee: Kabushiki Kaisha Pilot
    Inventors: Takeyuki Yamamoto, Yasuyuki Sugimoto, Itaru Wakagi, Shinichi Murakata, Yasuzo Murata
  • Patent number: 5594562
    Abstract: The liquid crystal display device of the externally charging type in accordance with present invention, includes a layered structure with: in the following order, a conductive layer; a transparent high-electric resistance layer having the thickness of 0.1 to 50 .mu.m and having a volume resistivity of 10.sup.13 .OMEGA..cm or more in 20.degree. C. air at a relative humidity of 90%; a liquid crystal-dispersed polymer layer in which liquid crystal is finely dispersed in a polymermatrix and which has a volume resistivity of 10.sup.13 .OMEGA..cm or more in 20.degree. C. air at a relative humidity of 90%; and a transparent insulator layer.
    Type: Grant
    Filed: February 1, 1994
    Date of Patent: January 14, 1997
    Assignee: Kabushiki Kaisha Pilot
    Inventors: Morio Sato, Yutaka Abe, Jun Takano, Hirokazu Ishii, Yasuzo Murata
  • Patent number: 5429503
    Abstract: A magnetic display panel which includes a multicell structure between two substrates is described. The cells are filled with a dispersion liquid including magnetic particles, a dispersion medium, and a thickener or the like, and a colorant can also be included in the dispersion liquid. The multicell structure and substrates are made of nonorientational and uncrystallized polyester resin. The magnetic display panel formed by such polyester resin is superior in display definition, non-deterioration ability, strength and the like.
    Type: Grant
    Filed: December 2, 1993
    Date of Patent: July 4, 1995
    Assignee: Kabushiki Kaisha Pilot
    Inventors: Yasuzo Murata, Takeo Yokoyama
  • Patent number: 5351143
    Abstract: A liquid crystal display device of externally charging type, including a screen from the outside of which display and erasing operations can be repeatedly performed simply, and having an excellent memory retention performance of the recorded image and durability. Also, a hand-writable liquid crystal board set being excellent in operativity, performances, safety, including the above liquid crystal display device as a liquid crystal board. The liquid crystal display device includes a layered structure comprising, in the following order: a conductive layer; a transparent high-electric resistance layer having a volume resistivity of 10.sup.13 .OMEGA..cndot.cm or more in a 20.degree. C. air at a relative humidity of 90%; a liquid crystal-dispersed polymer layer which has a volume resistivity of 10.sup.13 .OMEGA..cndot.cm or more in a 20.degree. C. air at a relative humidity of 90%; and a transparent insulator layer.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: September 27, 1994
    Assignee: Kabushiki Kaisha Pilot
    Inventors: Morio Sato, Yutaka Abe, Jun Takano, Hirokazu Ishii, Yasuzo Murata
  • Patent number: 4707593
    Abstract: A visible image magnetic card employing a magnetic recording sheet having a sandwich of a magnetic recording layer and a base sheet. A display sheet has a transparent display area with a display cell is formed between the display sheet and the magnetic recording sheet. The cell houses a mixture of magnetic particles and a transparent or translucent fine fluidizing powder.
    Type: Grant
    Filed: May 23, 1986
    Date of Patent: November 17, 1987
    Assignees: Pilot Man-Nen-Hitsu Kabushiki Kaisha, The Nippon Signal Co., Ltd.
    Inventors: Yasuzo Murata, Takeo Yokoyama, Hiroyuki Wada, Masaaki Sakurai
  • Patent number: 4643684
    Abstract: A magnetic display panel in which syneresis is completely eliminated between a colorant and a dispersion medium by the simultaneous use of organic and inorganic thickener. A liquid sealing space is provided between two substrates sealed by an adhesive in which space a dispersing liquid having a yield value of at least 5 dyne/cm.sup.2 is filled. The dispersing liquid is composed of fine magnetic particles, a colorant, a dispersion medium and the organic and inorganic thickeners. The organic thickener is preferably one of olefinic polymer, olefinic copolymer, wax, metal soap and dextrin fatty acid ester while inorganic thickener is preferably one of fine powder silicic acid and fine powder silicate.
    Type: Grant
    Filed: February 27, 1981
    Date of Patent: February 17, 1987
    Assignee: Pilot Man-Nen-Hitsu Kabushiki Kaisha
    Inventors: Yasuzo Murata, Hiroshi Sato
  • Patent number: 4536428
    Abstract: A magnetic display panel having a transparent or translucent front substrate and a rear substrate bonded thereto by an adhesive with a dispersing liquid confining space formed between the substrates, preferably in the form of multiple cells. The dispersing liquid, composed of a fine particulate thickener, fine magnetic particles, a colorant and a dispersing medium, has a yield value of at least 5 dyne/cm.sup.2. A clear, long-lasting image is recordable by tracing a permanent magnet upon the face of the first substrate.
    Type: Grant
    Filed: June 18, 1980
    Date of Patent: August 20, 1985
    Assignee: Pilot Man-Nen-Hitsu Kabushiki Kaisha
    Inventors: Yasuzo Murata, Hiroshi Sato
  • Patent number: 4368952
    Abstract: A magnetic reversal type display panel which provides clear display of records which can easily be raised by an erasure magnet. A liquid dispersion is sealed between two opposed surface plates, preferably in a cell structure. The liquid dispersion contains fine reversible magnetic display grains having magnetic poles of opposite signs tinged with different colors, a dispersion medium and a fine grain thickener. The fine reversible magnetic display grains have a residual magnetic moment within the range of 0.2 to 10 emu/g and a coercive force of not less than 500 oersteds and the liquid dispersion has a yield value of not less than 5 dynes/cm.sup.2.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: January 18, 1983
    Assignee: Pilot Man-Nen-Hitsu Kabushiki Kaisha
    Inventors: Yasuzo Murata, Hiroshi Sato
  • Patent number: 4143472
    Abstract: A display device is disclosed which employs a magnetic panel. The magnetic panel is formed by two oppositely arranged substrates at least one of which is transparent or semi-transparent. The space between the two substrates is filled with a dispersing liquid having a yielding value higher than 5 dyne/cm.sup.2. The dispersing liquid is prepared with fine magnetic grains, a coloring agent, a dispersing medium, and a fine grain thickener. Preferably, a multi-cell structure is provided in the space between the two substrates and the substrates are sealed to the multi-cell structure to form a plurality of independent display cells. A displaying magnet in the form of a pen is used to form a display by causing the fine magnetic grains to migrate to the front of the magnetic panel. An erasing magnet is slidably disposed at the rear of the magnetic panel.
    Type: Grant
    Filed: December 29, 1977
    Date of Patent: March 13, 1979
    Assignee: Pilot Man-Nen Hitsu Kabushiki Kaisha
    Inventors: Yasuzo Murata, Takeo Yokoyama, Hiroshi Murata