[alexander_busek]

But my curiosity would be what the “Metallic” coating and “Metallic” lining are exactly in these diagrams? Being put in parenthesis like that makes me think this is privileged information or it would just say “copper”.

It is de rigueur to be vague in patents - or at least no more specific than absolutely necessary.

Suppose you patent a device and specify "copper-coated" - then some other fellow makes a knock-off and points out: "Mine is silver-coated - hence no patent infringement!"

Regards,

[Openurmind]

I understood it as a possible (trade secret) but want to know what it is. It “hints” of being something other than being the normal copper.

Have any best guesses?