Abstract Techniques for the selective removal of conductive coatings from nonconductive base materials are disclosed. The invention contemplates the use of conventional photofabrication techniques to expose precisely defined regions of a coating, typically a metal-oxide, which are to be removed followed by the application of a metallic element and water and an acid. After the metaloxide coating, the slurry of the metallic element and water and the acid are brought in contact with each other, a reaction occurs whereby the metal-oxide coating is reduced to elemental metal. The reaction is allowed to continue for a short time only whereby the elemental metal is but superficially attacked and is followed by an acid wash to remove the exposed elemental metal coating.
Inventors
👤 Hans B Bullinger
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 17:43
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/0005; G03F7/0007
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
The process of claim 1 wherein said resulting tin layer is removed by contacting the same with an aqueous hydrochloric acid solution.
Claim 2
Dependent Claim
31 words
The process of claim 2 wherein said reaction of said tin oxide with said zinc and hydrochloric acid is terminated by application of a water wash to the resulting tin layer.
Claim 3
Dependent Claim
35 words
The process of claim 3 wherein the step of chemically removing said resulting tin layer comprises applying an aqueous hydrochloric acid solution stepwise at one area of the surface of said layer at a time.
Claim 4
Dependent Claim
40 words
The process of claim 4 wherein said exposed portions of said tin oxide coating are contacted with zinc, water and hydrochloric acid by application of an aqueous slurry of zinc powder, followed by application of an aqueous hydrochloric acid solution.