Editing Prior art (section)

====Validity====
A "validity search" is a prior art search done after a patent issues. The purpose of a validity (or invalidity) search is to find prior art that the patent examiner overlooked so that a patent can be declared invalid. This might be done by an entity [[patent infringement|infringing, or potentially infringing, the patent]], or it might be done by a patent owner or other entity that has a financial stake in a patent to confirm the validity of a patent. [[Crowdsourcing]], where a large number of interested people search for prior art, may be effective where references would otherwise be difficult to find.<ref>{{cite web |url=http://www.marketsandpatents.com/bulletin/IPB-06152012.html |archive-url=https://web.archive.org/web/20120719091041/http://marketsandpatents.com/bulletin/IPB-06152012.html |url-status=usurped |archive-date=July 19, 2012 |title=Patent Invalidity Search |last1=Nowotarski |first1=Mark |date=July 2012 |publisher=Insurance IP Bulletin |access-date=March 1, 2013}}</ref>