Method for embedding and recovering machine-readable information

Details Method for embedding and recovering machine-readable information Method for embedding and recovering machine-readable information

1995-12-05

1998-01-20

Evans, F. L.

Registers

Records

235494, G06K 1906

Patent

active

057104204

ABSTRACT:
Disclosed is a method of embedding and recovering machine readable information on a substrate which comprises (a) writing data in a predetermined machine readable code format on the substrate with a photochromic marking material having a first state corresponding to a first absorption spectrum and a second state corresponding to a second absorption spectrum; and (b) thereafter effecting a photochromic change in at least some of the photochromic marking material from the first state to the second state.

REFERENCES:
patent: 5051779 (1991-09-01), Hikawa
patent: 5091966 (1992-02-01), Bloomberg et al.
patent: 5128525 (1992-07-01), Stearns et al.
patent: 5168147 (1992-12-01), Bloomberg
patent: 5291243 (1994-03-01), Heckman et al.
patent: 5337361 (1994-08-01), Wang et al.

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