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Question for a lawyer
I'm writing a story about a patent dispute that took place in about 1940. I have written the sentence below, but I am not sure about the phrase, "part of the public domain." I'm not sure "public domain" is the right term. Can anyone advise me?
"Patent law at that time held that once a product is on sale for two years its design becomes part of the public domain and cannot be patented."
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