Light-sensitive material containing a dye-forming combination of

Details Light-sensitive material containing a dye-forming combination of Light-sensitive material containing a dye-forming combination of

1975-07-07

1977-06-21

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Electrode retaining or supporting means

96 27E, 25230135, G03C 152

Patent

active

040309266

ABSTRACT:
A storage medium for optical data recording comprises a dye-forming combination which on exposure to light within a first range of wavelengths reacts irreversibly to form a dye, but is substantially insensitive to light within a second range of wavelengths which is capable of energizing the dye to produce luminescence. The dye-forming combination consists of a heterocyclic compound of the formula I and of a cyclic dihalodicarbonyl compound of the formula II ##STR1## The symbols are defined in the specification. An example of formula I is benzofuran and an example of formula II is dibromomaleic anhydride.

REFERENCES:
patent: 3394395 (1968-07-01), Mattor et al.
patent: 3502476 (1970-03-01), Itano et al.
patent: 3671239 (1972-06-01), Zweig
patent: 3745004 (1973-07-01), Zweig

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