If you make one for yourself it's OK, if you make one for sale,
you might infringe on Mike Murphy's patent on aluminum foil patent.
I don't think so, if it is only the material claimed, that can be worked around I think,
especially if you're a smart inventor you could use a better alloy and combine with your own ideas
Just like a wheel if it is claimed round,
it doesn't mean you're infringing or can't invent another round wheel considering the prior arts.
That's the reason it is difficult to protect your own patent
Did you mean the Pat on the Pic