The patent application mentions a hard outer layer with an intermediate layer in between a metal substrate and the outside coating. The latter could be made of a ceramic material or a hard carbon-based material with all the hardness of a diamond. The outside layer would have a thickness between .5 micrometers and about 3 micrometers, and would be harder than the intermediate layer. This “in-between layer” would measure between 8 micrometers and 30 micrometers.
The name of the patent application is “Abrasion-Resistant Surface Finishes On Metal Enclosures On Metal Enclosures” and according to the document, the coatings provide improved resistance to abrasion and denting. The patent application adds that “Coatings that provide improved resistance to abrasion and denting are described.”
Check out some images from the patent application by clicking on the slideshow below.
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