A Blog About Intellectual Property Litigation and the District of Delaware


Entries for tag: disclaimer

A Markman ruling issued by Judge Andrews this week demonstrates how hard it can be to convince the Court that a patentee has disclaimed claim scope. In the MDL In re: Sitagliptin Phosphate ('708 & '921) Patent Litigation, Judge Andrews drew a distinction between the kinds of prosecution activity that can give rise to disclaimer, and those that cannot.

Surfactants at work
Surfactants at work Soap bubbles_3, Daniele Levis Pelusi, Unsplash

In short, defendants argued that the plaintiff had disclaimed claim scope regarding the nature and purpose of the claimed "surfactant" during prosecution. The Court ultimately agreed in part, finding that "surfactant" had been limited to a "wetting agent" that increases dissolution of sitagliptin.

It is worth noting here that …