Are Two Heads Better than One?
When faced with parallel PTAB and District Court/ITC proceedings, both patent owners and petitioners alike must decide whether to use the same expert in each proceeding, or hire a dedicated expert for each. Certainly there is much efficiency to be gained using the same person — not to mention the seeming likelihood of greater consistency in opinion.
But it is preferable, in my view, to use separate experts. This often limits document inventory for the PTAB deposition, and opposing counsel is less inclined to extend the deposition with questions that are designed to illicit fodder for the litigation effort. Likewise, use of separate experts does not give litigation counsel extra “shots” at the same witness. Also, with the PTAB now applying the same Philips claim construction of the district court, as discussed previously, there is also an increased interest in claim construction related testimony should the PTAB proceeding fail.
Recently, the District of Delaware considered whether a litigation expert should have to divulge any consulting (non-testifying) work with respect to an earlier PTAB proceeding.