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A claim that contains in its preamble subject matter that is in the prior art. MPEP 2137.01.
This is a claim form wherein the preamble acknowledges the prior art teachings. The words "the improvement comprising" or "the improvement consisting of" or "the improvement consisting essentially of" are generally employed to form a border between the preamble and the body of the claim. It is followed in the body of the claim by what is believed to be unique.
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