Compositions – Electrically conductive or emissive compositions
Reexamination Certificate
2005-06-09
2009-12-29
Pyon, Harold (Department: 1796)
Compositions
Electrically conductive or emissive compositions
C554S035000, C554S221000, C568S420000, C568S446000, C568S445000, C435S006120, C435S069100, C435S252300
Reexamination Certificate
active
07638073
ABSTRACT:
The present invention relates to a photochromic material comprising a proteorhodopsin apoprotein and a retinal analog. In one embodiment, the retinal analog is an azulenic retinoid compound. In another embodiment, the retinal analog is a compound that is structurally similarly to all-trans-retinal. The proteorhodopsin apoprotein and the retinal analog form a photochromic material having different spectral properties from those of a corresponding photochromic material formed by the same proteorhodopsin apoprotein and all-trans-retinal. In one embodiment of the application, the retinal analog-containing proteorhodopsin has an absorbance spectrum that does not overlap significantly with that of all-trans-retinal-containing proteorhodopsin. In another embodiment of the application, the retinal analog-containing proteorhodopsin yields a red-shifted visual chromophore compared with the all-trans-retinal-containing proteorhodopsin chromophore. The photochromic material of the present invention is useful as an optical data storage carrier, a fraud-proof optical data carrier, security ink, and in other optical applications.
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Int'l Search Report, PCT/US05/20900, mailed Nov. 1, 2005.
Asato Alfred E.
Jensen Rasmus B.
Kelemen Bradley R.
Ward, II Donald E.
Chiang Timothy
Genencor International Inc.
Howrey LLP
Kung Viola T.
Pyon Harold
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