Look Both Ways: A Two-Way Test to Determine Whether Pre- And Post-bar Date Claims Are Materially Different Applies in Interference Proceedings

Appeal from the United States Patent and Trademark Office, Patent Trial and Appeal Board. Summary: Comparing pre-Section 135 bar date claims to amended post-bar date claims in an interference proceeding requires comparing the two sets of claims to determine if either set contains material limitations not found in the other—a “two-way test.”…
By: Knobbe Martens
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