06/28/2023
Although we do not litigate patent cases, we do partner up with firms that do. One thing we have not seen very often is patent litigators who challenge the validity of a patent because its claims encompass embodiments that are not enabled or sufficiently described to indicate that they were within the scope of what is invented.
Patent drafters often claim an invention "as broadly as the prior art will allow." That means the claims can cover vast numbers of embodiments that are not specifically discussed in the patent. In general, there is nothing wrong that. Patent claims almost always go beyond the specific embodiments in the patent, and in our experience, almost all patent cases involve claims that encompass an embodiment or example that was not specifically disclosed.
However, there is a limit to all of this, and the Supreme Court (in an 8-0 decision) reinforced it recently in Amgen v. Sanofi (Slip Op., Case No. 21-757 May 18, 2023), . A patent must enable the full scope of what is claimed. It is not sufficient to simply teach a few examples IF that claims cover many other examples that could not be practiced without "undue experimentation."
The problem of claiming non-enabled embodiments is particularly acute in the life sciences and chemical arts which tend to be more unpredictable than the chemical and electrical arts, but the law is the same regardless of technology.
So, if you are defending a case involving broad claims that seem to go well beyond what someone could actually practice based on what the patent teaches, consider asserting invalidity under the enablement and/or written description sections of the Patent Statute. One strategy would be to identify as large a number of examples that are covered by the claims but not disclosed in the patent and then try go figure out what it would take to practice those examples. This may identify "holes" in the patent's teachings. You would likely do this in consultation with your expert witnesses, and it would give you a roadmap for deposing the inventors and the patent holder's experts and building a case that the full scope of the claims is not enabled.
A written description attack would be similar but not identical. More about that in another post.