Patents by Inventor Masahiko Wakana

Masahiko Wakana 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).

  • Information storage medium and method for detecting forgeries
    Patent number: 5760384
    Abstract: An information storage medium has a base portion and a code storage portion. The code storage portion is disposed on the base portion and contains an infrared absorber which absorbs substantially only infrared rays within a narrow wavelength band. If a real information storage medium is produced like that, subject mediums are judged real or not by a method includes the steps of emitting rays to the subject medium, receiving rays reflected from the subject medium, detecting a first reflectance at the peak absorption wavelength and a second reflectance at a comparison wavelength near the peak wavelength, and judging if the subject medium is real or not. The rays at the comparison wavelength are not very much absorbed by the absorber.
    Type: Grant
    Filed: January 5, 1996
    Date of Patent: June 2, 1998
    Assignee: Toppan Printing Co., Ltd.
    Inventors: Noriyuki Itoh, Masahiko Wakana, Manabu Suzuki, Haruki Ohta
  • Information storage medium and method for detecting forgeries
    Patent number: RE37491
    Abstract: An information storage medium has a base portion and a code storage portion. The code storage portion is disposed on the base portion and contains an infrared absorber which absorbs substantially only infrared rays within a narrow wavelength band. If a real information storage medium is produced like that, subject mediums are judged real or not by a method includes the steps of emitting rays to the subject medium, receiving rays reflected from the subject medium, detecting a first reflectance at the peak absorption wavelength and a second reflectance at a comparison wavelength near the peak wavelength, and judging if the subject medium is real or not. The rays at the comparison wavelength are not very much absorbed by the absorber.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: January 1, 2002
    Assignee: Toppan Printing Co., Ltd.
    Inventors: Noriyuki Itoh, Masahiko Wakana, Manabu Suzuki, Haruki Ohta