Simulated patina for copper

Coating processes – Nonuniform coating – Applying superposed diverse coatings or coating a coated base

Reexamination Certificate

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C427S428060, C427S428070

Reexamination Certificate

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07018677

ABSTRACT:
A process for imparting a simulated patina appearance to a copper substrate, and a substrate having that appearance. A colorant having the desired initial patina color tone is employed to produce a non-continuous layer of colorant on the surface of a copper substrate by roll coating. The appearance of patination of the desired tone is created by interspersed spots of colorant with the remaining portion of the substrate being exposed for natural patination. The interspersed spots of colorant may be produced by screen printing, by spattering, as by spraying, or by mechanical removal of colorant after application to the substrate surface, or a combination.

REFERENCES:
patent: 1985236 (1934-12-01), Blatz
patent: 2113449 (1938-04-01), Hoffman et al.
patent: 4220679 (1980-09-01), Backhouse
patent: 4416940 (1983-11-01), Loye et al.
patent: 4837056 (1989-06-01), Easley
patent: 5340610 (1994-08-01), Thompson
patent: 6176905 (2001-01-01), Priggemeyer et al.
patent: 2002-180264 (2002-06-01), None
Evergreen Pre-patinated Architectural Sheet Copper by Revere, Revere Copper Products, Inc. no date.

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