What is the exception to all inventors signing an affidavit or declaration under 37 CFR 1.131(a)? While generally all inventors must sign an affidavit or declaration under 37 CFR 1.131(a), there is an important exception. According to MPEP 715.04: “An affidavit or declaration under 37 CFR 1.131(a) may be signed by less than all named…

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