Title: Article marking method

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.

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Inventors: White, Paul L. (Toledo, OH, US)

Application Number: 601751
Filing Date: 1975-08-04
Publication_date: 1979-03-06
Assignee: Owens-Illinois, Inc. (Toledo, OH)
Primary Class(es): 427/145 427/380
Other Classes:
US Patent Ref:

2468402	Apr, 1949	Kreidl et al.	65/31.
3833406	Sep, 1974	White	252/194.

Other Refs:
Primary Examiner: Pianalto, Bernard D.
Assistant Examiner:
Attorney: McLary; Steve M., Holler; E. J.