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How do I know if I can sell an item that is already in the market? Not sure if it has a patent or not

I had an idea that I thought did not exist but turns out it does exist and in fact I found many items for sale online (the material is different but the final purpose is the same). In that case I will ...
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Has this patent been granted and how do I contact the named inventor?

In reference to the patent: US7925036 Has this patent been granted and how do I contact the named inventor?
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A patent have nationality?

I mean if I patented something for example in the United States, then my invention could be said to be American? Something like "the airplane was patented in USA so now the airplane is American and ...