What is a prosecution disclaimer in patents?

It's when your statements to the USPTO during examination narrow what your claims cover, even if unintended — and it sticks in court.

Does examiner rejection cancel a prosecution disclaimer?

No. Fed Circuit just ruled in Puradigm it survives rejection, binding you anyway.

How to avoid prosecution disclaimer traps?

Withdraw arguments explicitly, claim functionally, and audit histories pre-suit with AI tools.

©️ IP & Copyright

Prosecution Disclaimers That Refuse to Die

Your patent application's offhand remarks just became landmines. Federal Circuit says even rejected prosecution statements can kill infringement claims down the line.

theAIcatchup Apr 08, 2026 4 min read

Gavel striking down on patent prosecution history documents in Federal Circuit courtroom

⚡ Key Takeaways

Rejected prosecution statements can still limit patent scope years later. 𝕏
Federal Circuit affirms: disclaimers extend logically to related structures. 𝕏
Shift strategies: explicit withdrawals and AI risk audits now essential. 𝕏

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theAIcatchup

Where law meets technology.

#Federal Circuit #Judge Prost #patent estoppel #patent infringement #prosecution disclaimer

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Originally reported by Patently-O

⚡ Key Takeaways

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