Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2005-11-17
2010-06-22
Nelms, David (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S175000, C349S176000
Reexamination Certificate
active
07742136
ABSTRACT:
A sheet with anti-counterfeit functions for making counterfeiting highly difficult in the case where authentication information is recorded using the properties of cholesteric liquid crystal is provided. A cholesteric liquid crystal layer110having a selective reflected wavelength band in at least the visible light region is provided in such a manner that this cholesteric liquid crystal layer110is a single layer of which thickness is approximately uniform, and an authentication region112of which selective reflected wavelength band is different is provided in at least one place. Preferably, an adhesive layer130is provided on one side of the cholesteric liquid crystal layer110. Preferably, a base120is provided between the cholesteric liquid crystal layer110and the adhesive layer130. Preferably, a light absorbing layer140is provided on adhesive layer130of the cholesteric liquid crystal layer110.
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Japanese Office Action dated Oct. 21, 2009, issued in corresponding Japanese patent application No. 2004-337473.
Fukuoka Takahiro
Shiraogawa Miki
Takahashi Naoki
Takeda Kentarou
Umemoto Seiji
Merlin Jessica M
Nelms David
Nitto Denko Corporation
Westerman Hattori Daniels & Adrian LLP
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