Can applicants be their own lexicographers in patent claims?

Yes, applicants can be their own lexicographers in patent claims. According to MPEP 2173.01: “A fundamental principle contained in 35 U.S.C. 112(b) or pre-AIA 35 U.S.C. 112, second paragraph is that applicants are their own lexicographers. They can define in the claims what the inventor or a joint inventor regards as the invention essentially in…

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