According to a couple of sources, there are some very early patents (filed in 1996 and awarded three years later) on pay-per-click advertising that could spark a bidding war. The patents cover systems and methods for online advertising rather than the technology for it, and have been dormant for years after the filing company went under.
ThePatentProspector, that the patents nos. 5,933,811, which is expired, and its continuation, 6,385,592, which is not expired, were filed by now-defunct company Big Media. The company's creditors are trying to force the sale of the patents in order to recoup their losses. The patent covers "A System and Method for Delivering Personalized Advertising Over Interactive Systems," which translates in 2006 to the very systems Google, Yahoo!, MSN, Ask, you name it, base their entire business models on. From Del.icio.us | Digg | Yahoo! My Web | Furl Bookmark Murdok:PPC Patent Bid War On The Horizon
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