Is double inclusion always improper in patent claims?

No, double inclusion is not always improper in patent claims. The MPEP 2173.05(o) clearly states: “There is no per se rule that ‘double inclusion’ is improper in a claim.” The MPEP further elaborates by citing In re Kelly, which states: “Automatic reliance upon a ‘rule against double inclusion’ will lead to as many unreasonable interpretations…

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