Patents by Inventor Shigeru Kitahara

Shigeru Kitahara 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).

  • Porous resin stamp
    Patent number: 6862987
    Abstract: The present invention relates to a porous resin stamp which can repeatedly seal without supplying ink for a long period of time by beforehand soaking ink therein. The present invention also relates to a cartridge comprising the porous resin stamp and a stamp comprising the cartridge. Colors of the stamp can be intentionally adjusted by adjusting the amount of heating materials combined or the mixing rate of heating materials. Thus, it is possible to precisely check the desired letters, designs, patterns and so on. Furthermore, it is possible to intentionally adjust efficiency rate of heat generation of the heating materials by suitably changing the amount of heating materials. This makes it possible to express any small letters, minute designs and patterns with high reproducibility.
    Type: Grant
    Filed: August 20, 2003
    Date of Patent: March 8, 2005
    Assignee: Sunlux Corporation
    Inventors: Shigeru Kitahara, Yasuo Nagasawa, Yuji Tanaka, Yoshitomo Tanaka
  • Porous resin stamp
    Publication number: 20040083912
    Abstract: The present invention relates to a porous resin stamp which can repeatedly seal without supplying ink for a long period of time by beforehand soaking ink therein. The present invention also relates to a cartridge comprising the porous resin stamp and a stamp comprising the cartridge. Colors of the stamp can be intentionally adjusted by adjusting the amount of heating materials combined or the mixing rate of heating materials. Thus, it is possible to precisely check the desired letters, designs, patterns and so on. Furthermore, it is possible to intentionally adjust efficiency rate of heat generation of the heating materials by suitably changing the amount of heating materials. This makes it possible to express any small letters, minute designs and patterns with high reproducibility.
    Type: Application
    Filed: August 20, 2003
    Publication date: May 6, 2004
    Inventors: Shigeru Kitahara, Yasuo Nagasawa, Yuji Tanaka, Yoshitomo Tanaka
  • Method of producing a porous resin stamp
    Patent number: 6645418
    Abstract: The present invention aims to provide a porous resin stamp, which can repeatedly seal without supplying ink for a long period of time by beforehand soaking ink therein, and a producing method thereof. The present invention is characterized in the producing method of porous resin stamp, wherein an original that can selectively pass light through is put together with a porous resin body combined with at least phathalocyanine pigments as heating material which generate heat by light irradiated from a light source; the light is irradiated from the original side toward the surface of porous resin body; and an ink inexuding portion is formed by melting a surface layer of the porous resin body with heat of the heating material generated by the light passed through the original.
    Type: Grant
    Filed: January 16, 2001
    Date of Patent: November 11, 2003
    Assignee: Sunlux Corporation
    Inventors: Shigeru Kitahara, Yasuo Nagasawa, Yuji Tanaka, Yoshitomo Tanaka
  • Porous resin stamp and a producing method thereof
    Publication number: 20020066980
    Abstract: The present invention aims to provide a porous resin stamp, which can repeatedly seal without supplying ink for a long period of time by beforehand soaking ink therein, and a producing method thereof.
    Type: Application
    Filed: January 16, 2001
    Publication date: June 6, 2002
    Inventors: Shigeru Kitahara, Yasuo Nagasawa, Yuji Tanaka, Yoshistomo Tanaka