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ARTICLE · 03 NOVEMBER 2026

USPTO Issues Precedential Decision Expanding Obviousness-Type Double Patenting

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The USPTO's Administrative Review Panel has issued a precedential decision addressing when obviousness-type double patenting rejections apply, particularly when a pending application expires before its reference patent. The decision examines two competing rationales—preventing patent term extension and preventing harassment through multiple infringement suits—and proposes a framework based on patent term filing dates while acknowledging tension with Federal Circuit precedent.

United StatesIntellectual Property

What You Need to Know

  • Key takeaway #1

    The USPTO’s Appeals Review Panel (ARP) recently reversed a Patent Trial and Appeal Board (PTAB) decision, holding that the anti-harassment rationale (which prevents multiple infringement suits by different assignees asserting patents on obvious variants) independently supports an obviousness-type double patenting (OTDP) rejection, while inviting the Federal Circuit to clarify whether that rationale should do so.

  • Key takeaway #2

    Shortly after the ARP decision, the USPTO Director filed a brief in Inre: Ablynx N.V. in a separate case on the same issue at the Federal Circuit defending the anti-harassment rationale as grounded in precedent and urging that it be upheld. The resulting differences in view between the two agency positions have generated doctrinal uncertainty.

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