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Before you start putting energy in prototype development it is wise to check if it is really new.
If your idea is a patentable item you can start doing this by searching in the patent database at www.uspto.gov to check if it hasn't been patented already. There are lots of products that "don't exist" on the market, but which have been patented years or decades ago.
If your idea is a patentable item you can start doing this by searching in the patent database at www.uspto.gov to check if it hasn't been patented already. There are lots of products that "don't exist" on the market, but which have been patented years or decades ago.