Article marking method

Details Article marking method Article marking method

1975-08-04

1979-03-06

Pianalto, Bernard D.

Coating processes

Latent image formed or developed

427380, B44F 110, G03C 1122

Patent

active

041431804

ABSTRACT:
A method for article coding using transparent indicia formed essentially of aluminum monohydrate. An article may be marked with a serial number or the like with a liquid material consisting essentially of aluminum monohydrate. When dried, the marking will be transparent. The marking will have a higher affinity for indicator solutions than will the substrate, and will therefore become visible when the article is sprayed or coated with such a solution. The article may be glass, metal, paper, wood or plastic. If the substrate material permits, heating to 300.degree. C. after coating with the indicator solution will destroy the indicator and render the marking or indicia transparent again.

REFERENCES:
patent: 2468402 (1949-04-01), Kreidl et al.
patent: 3833406 (1974-09-01), White

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