Parties stipulate to drop various claims and defenses all of the time. Sometimes, the parties simply bargain with each other to winnow down the scope of the case for trial. Other times, a defense or claim may be dropped to avoid some especially harsh discovery burden. Sometimes you just hate a patent claim sooo much.
Always there are dangers. For one rule is supreme in the realm of stipulations.
No takebacks.
Such was the lesson this week in Allergan, Inc. v. Mankind Pharma Ltd., C.A. No. 23-272-JFM, D.I. 126 (D. Del. July 24, 2024). The defendant, Mankind, had stipulated to drop all invalidity defenses as to one patent "because it would streamline the case and would allow them to avoid answering discovery requests" and because "the 504 patent had been unsuccessfully challenged in the past and the invalidity theories that remained were weak." Id. at 4.
A bit later Judge Andrews issued is opinion in Allergan USA, Inc. v. MSN Labs. Private Ltd., C.A. No. 19-1727-RGA (D. Del. Sept. 27, 2023), which we covered previously on the blog. TL;DR Judge Andrews held (for the first time in the district) that OTDP applied when the first-filed, and first-issued, patent was the one being invalidated.
All of a sudden, the defendant realized that they might have a real humdinger of a defense and so they moved to "vacate" the earlier stipulation in anticipation of the Federal Circuit affirming the decision in MSN.
Visiting Judge Murphy, however, held that this ...
