Interestingly, here's a recent TTAB decision (albeit non-precedential) that was recently linked on WR, holding that a Wikipedia article may NOT generally be used to establish controverted facts in a registration proceeding: http://ttabvue.uspto.gov/ttabvue/ttabvue-91188584-OPP-10.pdf This is consistent with the weight of the (court) caselaw in the US. Judges sometimes cite Wikipedia articles for uncontroversial background information, but hold that they aren't admissible to establish disputed facts -- in large measure, simply relying on the on-wiki disclaimers. Newyorkbrad On Tue, Dec 28, 2010 at 10:15 PM, Cool Hand Luke < failure.to.communicate(a)gmail.com&gt; wrote: http://thettablog.blogspot.com/2010/12/precedential-no-43-ttab-reverses.html