In ex parte Ho, the subject of my last post, the PTAB reversed the Examiner’s rejection of claims to a population of bone marrow cells obtained by two-stage culturing that expressed or failed to express certain markers. The PTAB wrote that, for the purposes of the appeal, it would be assumed that the cells were a natural product, but went on to find that they were markedly different from any naturally occurring counterpart cells. The problem with this abbreviated analysis is the PTAB’s assumption that the claimed cell population is a natural product, and effectively forcing the appellant to traverse Step 2 of the Mayo/Alice test. In ex parte Ho, the appellant was able to present evidence to this effect, including an expert’s declaration. But should they have had to?
Ex parte Parenteau, Appeal No. 2017-002191 (PTAB, August 22, 2018), is a slightly earlier decision in which the Board reversed both a s. 103 rejection and a s. 101 “natural product” rejection of claims directed to cultured tumor cells containing a population of 51-100% rapidly dividing C-RC cells that consists of 80-100% actively expanding and dividing VSEC, SDEC and SCEC cells and abnormal transit amplifying cells. The cultivating step is carried out in a serum-free, defined cell culture medium containing agents selected from the group consisting of 9 classes of agents, including TNF-alpha.