contingent terminal disclaimer

Latent OTDP Issues & Litigation

The Federal Circuit’s decision in In re Cellect clarified that patenting obvious variants of the same invention across multiple patents—Obvious-Type Double Patenting (OTDP)—can result in the elimination/reduction of Patent Term Adjustment (PTA). OTDP was fatal to the challenged Cellect patents given the expiration of the reference patent. This was because a terminal disclaimer to remedy OTDP is not possible after expiration. Earlier this year I explained ways to proactively insulate a patent portfolio from potential Cellect vulnerabilities.

For patent owners facing newly invigorated OTDP attacks in litigation, and where a terminal disclaimer can still be filed, the potential loss of significant PTA creates a strategic quandary.

A terminal disclaimer cannot be withdrawn once filed. So, if a patent owner simply files a terminal disclaimer to moot the OTDP challenge, years of additional patent term (PTA) may be unnecessarily surrendered where the patent owner might have won. But, if the patent owner loses on OTDP without a terminal disclaimer on file, the patent is invalidated.

Recently a patent owner attempted to resolve this quandary with a contingent terminal disclaimer.Continue Reading Contingent Terminal Disclaimers?