Process for identification marking clear plastic articles

Details Process for identification marking clear plastic articles Process for identification marking clear plastic articles

1978-03-06

1980-12-09

Hoffman, James R.

Coating processes

Fraud or tamper detecting

8 4, 427145, 427507, G02B 110, C09K 1100

Patent

active

042385245

ABSTRACT:
A fade resistant, visually undetectable identification mark is imparted to an optically clear plastic lens or the like by providing a marking composition comprising a fluorescent dye and a liquid carrier material, and preferably including an inert sublimable solid diluent, applying the composition in a selected pattern on the surface of an article to be marked, removing the carrier material from the composition to leave a solid residue of the fluorescent dye and inert solid diluent, and permanently transferring the dye to a surface layer of the article as by heating. The mark enables a manufacturer to identify a particular article as its product by exposing it to ultraviolet radiation, yet the mark does not adversely affect the visible light optical properties of the article.

REFERENCES:
patent: 3625731 (1971-12-01), Taylor
patent: 3646054 (1972-02-01), Kiechmayr et al.
patent: 3683336 (1972-08-01), Brownlee et al.
patent: 3740402 (1973-06-01), Cevasco
patent: 3837890 (1974-09-01), Sumner et al.
patent: 3944637 (1976-03-01), Bond et al.
patent: 4039827 (1977-08-01), Zdrok et al.

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