Plain copper foodware and metal articles with durable and tarnish free multiplayer ceramic coating and method of making

This describes a copper cooking pot or pan with a special multi-layered coating to make it durable, tarnish-free, and stick-resistant. The coating starts with a plain copper base, followed by a base layer applied using a combination of cathodic arc and sputtering techniques for strong adhesion. On top of that is a ceramic layer, typically a nitride or carbonitride, which provides the tarnish-free and durable surface while maintaining copper's excellent heat conductivity.

Why it matters: Since 2009, advancements in physical vapor deposition (PVD) technology, particularly the precision and cost-effectiveness of combined cathodic arc and sputtering, may have made such durable, multi-layer ceramic coatings more commercially viable for high-end copper foodware. This could enable wider adoption of premium, tarnish-free copper cookware that maintains its excellent heat conductivity.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedPVD sputtering and cathodic arc equipment

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