Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Reexamination Certificate
2004-10-27
2008-11-11
Angebranndt, Martin J (Department: 1795)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
C430S945000, C428S064400, C369S284000, C369S288000, C369S112020, C369S094000
Reexamination Certificate
active
07449278
ABSTRACT:
A multilayer optical recording medium including a first recording layer for recording or reproducing information by using a first light beam having a center wavelength λ1, a first photochromic layer provided on the first recording layer, and a first optical waveguide layer provided on the first photochromic layer for guiding to the first photochromic layer a second light beam having a center wavelength λ2 different from the center wavelength λ1. The multilayer optical recording medium further includes a second recording layer provided on the first optical waveguide layer for recording or reproducing information by using the first light beam, a second photochromic layer provided on the second recording layer, and a second optical waveguide layer provided on the second photochromic layer for guiding the second light beam to the second photochromic layer. The first and second photochromic layers become transparent to the first light beam by irradiation with light or by application of heat. The reflectance of each of the first and second photochromic layers to the first light beam can be repeatedly increased by irradiation with the second light beam and can be repeatedly decrease to restore the transparent state.
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Translation of JP 2001-184641 (aka 13-184641).
Angebranndt Martin J
Fujitsu Limited
Greer Burns & Crain Ltd.
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