Upon re-examination, the United States Patent and Trademark Office (USPTO) has rejected all the claims of three issued patents on human embryonic stem cells. These patents, based on the work of James A. Thomson, are held by the Wisconsin Alumni Research Foundation (WARF), the patent licensing arm of the University of Wisconsin.

New York Times reports:

In decisions posted today on the [USPTO's] web site, the examiners said the Wisconsin cells appeared to be either the s  More ...