Patents by Inventor Tadashi Koriki

Tadashi Koriki 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: 7600938
    Abstract: A refill for a correction pen is constructed of a molded article of a polyamide resin obtained from monomers having an aromatic ring or a naphthene ring, a molded article of a blend of two or more kinds of polyamide resins, or a molded article having a multi-layered structure of two or more layers whose innermost layer in contact with the correction fluid is constituted of a polyamide resin. The applying part of a refill unit mounted on a ballpoint type applicator having a pressurizing mechanism in linkage with clicking action is formed by press fitting the rear end of a ballpoint pen tip having a rotatable ball to the attachment portion at the front end of an ink reservoir and a metal tube is squeezed to cover the outer periphery of the attachment portion at the front end of the ink reservoir to which the tip is fitted.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: October 13, 2009
    Assignee: Mitsubishi Pencil Co., Ltd.
    Inventors: Kyoko Kobayashi, Makoto Ono, Akira Fukai, Takao Koyama, Hitoshi Nakamura, Kei Omoto, Tadashi Koriki
  • Patent number: 7417080
    Abstract: Provided is an oil-based ink composition comprising at least a colorant, titanium oxide, a solvent including propylene glycol monomethyl ether and ethanol, a polyvinylbutyral resin and a ketone resin.
    Type: Grant
    Filed: December 10, 2004
    Date of Patent: August 26, 2008
    Assignee: Mitsubishi Pencil Co., Ltd.
    Inventors: Masanao Yano, Yoshihito Fujiwara, Tadashi Koriki, Yuji Omori, Naoto Yokokawa
  • Publication number: 20060075924
    Abstract: A refill for a correction pen which is excellent insolvent resistance and moldability and can make its content, i.e., a correction fluid having methyl cyclohexane as the main solvent and the remaining amount easily visible during usage and as time passes, is constructed of a molded article of a polyamide resin obtained from monomers having an aromatic ring or a naphthene ring, a molded article of a blend of two or more kinds of polyamide resins, or a molded article having a multi-layered structure of two or more layers whose innermost layer in contact with the correction fluid is constituted of a polyamide resin.
    Type: Application
    Filed: March 3, 2004
    Publication date: April 13, 2006
    Inventors: Kyoko Kobayashi, Makoto Ono, Akira Fukai, Takao Koyama, Hitoshi Nakamura, Kei Omoto, Tadashi Koriki
  • Publication number: 20050137285
    Abstract: Provided is an oil-based ink composition comprising at least a colorant, titanium oxide, a solvent including propylene glycol monomethyl ether and ethanol, a polyvinylbutyral resin and a ketone resin.
    Type: Application
    Filed: December 10, 2004
    Publication date: June 23, 2005
    Applicant: Mitsubishi Pencil Co., Ltd.
    Inventors: Masanao Yano, Yoshihito Fujiwara, Tadashi Koriki, Yuji Omori, Naoto Yokokawa
  • Patent number: 6435751
    Abstract: A click type writing implement includes: a ball-pen refill composed of a point assembly at the front end thereof, an ink storage at the rear thereof and a pressurizing mechanism of a pumping type at the rear of the ink storage; an arrangement for holding the refill and engaging it so as to allow the tip of the point assembly to be projected from and retracted into the front end; and a clicking mechanism for keeping the tip of the point assembly projected, the clicking mechanism comprising: a first clicking mechanism for advancing and contracting ink by a short stroke and a second clicking mechanism for advancing and contracting ink by a large stroke, so that the rear end of ink can be pressurized at two levels so as to promote flow of ink toward the point assembly.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: August 20, 2002
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Makoto Ono, Hitoshi Nakamura, Tadashi Koriki, Tamotsu Eguchi, Seiichi Kobayashi
  • Patent number: 5957609
    Abstract: An applicator includes: a barrel body; a holder having a ball house with an ejecting opening at front end for allowing the liquid from the barrel body to flow out; a ball held in the ball house, as being partially exposed to the outside through the ejecting opening; a spherical evading member disposed on the rear side of the ball and having a smaller diameter than that of the ball; a ball seat disposed in the rear part of the ball house, for receiving the rear side of the evading member; a liquid conduit provided in an approximately central part of the ball seat; longitudinal grooves formed on the inside wall of the liquid conduit; and a pressing means disposed through the liquid conduit for urging the evading member forward.
    Type: Grant
    Filed: July 25, 1995
    Date of Patent: September 28, 1999
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Masaaki Morita, Yasuyuki Iwase, Atsunori Satake, Tadashi Koriki, Masao Hashi