The US Court of Appeals for the Federal Circuit affirmed a Patent Trial & Appeal Board unpatentability determination, finding that a skilled artisan would have found the term “sterile” in a UK publication to mean the same as the term “sterilized” in the United States. Sage Products LLC v. Stewart, Case No. 23-1603 (Fed. Cir. Apr. 15, 2025) (Reyna, Cunningham, Stark, JJ.)
Sage owns two patents related to a sterilized chlorhexidine product in a package, such as an applicator filled with an antiseptic composition for disinfecting skin. Becton, Dickinson and Company petitioned for inter partes review (IPR) of both patents. The Board relied on four key pieces of prior art, including one that was a UK publication, to find the challenged claims unpatentable. In instituting the IPR and evaluating the petition, the Board construed the term “sterilized” to mean that “the component or composition has been subjected to a suitable sterilization process such that sterility can be validated.” In the final written decision, the Board found that a skilled artisan at the time of the invention would have known, through education and experience, that the term “sterile,” as used in the UK prior art publication, is equivalent to the term “sterilized,” as used in the US and particularly in the Sage patents. Reviewing the totality of the evidence before it, including both parties’ experts’ reports and testimony, the Board determined the challenged claims were unpatentable. Sage appealed.
The Federal Circuit declined to overturn the Board’s findings, affirming the Board’s definition of a person of ordinary skill in the art and their understanding of the term “sterilized” at the time of the invention. The Court found that the Board did not ignore or disregard evidence but properly weighed the evidence before it, concluding that a skilled artisan having the education and experience required by the Board’s definition would know the differences between the US and UK regulatory standards for “sterile” and therefore would know that UK references to “sterile” items would satisfy the challenged claims’ requirement for “sterilized” items.
[View source.]
