The United States Patent and Trademark Office has issued Re-examination Certificates for the two most important base embryonic stem cell patents held by the Wisconsin Alumni Research Foundation (WARF).
This ruling is not appealable, which means that the claims of these patents stand confirmed and enforceable.
This action officially concludes a re-examination process for these patents that began in October of 2006, and was decided in WARF’s favor in March of this year. This final process was little more than a formality.