An interesting note found at PATracer discusses an appellate case currently pending with the CAFC which presents the issue of “claim preclusion” – that is, if a plaintiff in a patent infringement case has an opportunity to raise an allegation of infringement in the first instance and chooses not to, does the plaintiff waive the right to raise the allegation in a subsequent lawsuit?
In Hemphill v. Kimberly-Clark (CAFC 2008-1460), plaintiff Allegra Hemphill sued Kimberly-Clark (and co-defendant Proctor & Gamble) in 2002 for patent infringement, on the basis that certain of defendants’ products infringed claim 1 of Ms. Hemphill’s United States Patent 4,557,720. At the trial court level, Kimberly-Clark won on summary judgment, with a finding of non-infringement as to claim 1.
Ms. Hemphill then proceeded to file a NEW lawsuit against the same products, with the same patent – but instead alleged infringement of claim 2 of the patent. The trial court dismissed the second lawsuit on the basis that since Ms. Hemphill had filed a prior infringement lawsuit against the SAME defendants, on the SAME products, as to the SAME patent, that the new suit was barred by the legal concept of “res judicata” (for non-lawyers out there, a very, very simplistic explanation of this concept is that a plaintiff does not get more than one swing at the piñata).
Ms. Hemphill has appealed dismissal of the second suit to the CAFC. It appears fairly certain that the CAFC would uphold the trial court’s dismissal of the second suit, but the CAFC may take the opportunity to release an opinion that offers more insight into its thoughts on the doctrines of claim preclusion and res judicata in the context of patent litigation.
You might wonder why Hemphill did not assert all claims of the patent in the first case…one answer may be that Hemphill appears to have chosen to proceed in the cases “pro se” – that is, without the assistance of an attorney.
Ms. Allegra’s patent may be viewed at http://www.google.com/patents?id=p2UWAAAAEBAJ&dq=4557720.
PATracer’s note on the case may be found at
http://www.patracer.com/the_patent_litigation_blo/2008/07/if-i-dont-win-o.html.
Recent Comments