Webvention LLC (which also litigates under names such as Webvention Company) is a company that mostly exists to exploit the "rollover menu" patent (#5,251,294)
Webvention is suing Abercrombie & Fitch, Bed Bath & Beyond, Brown Shoe Co., Church & Dwight Company, Conocophillips, Dell, Donaldson Company, E*Trade Financial Corporation, Gamestop, Htc America, Iasis Healthcare, Insight Enterprises, Neiman Marcus, Pioneer Natural Resources, Tenneco, The Finish Line, Travelcenters Of America, United Parcel Service, Visa.
 Related pages on en.swpat.org
- Patent Litigation Weekly: NPE Makes Offer Some Companies Can Refuse, 4 Oct 2010, law.com
- Rollover image on your website? That will be $80,000 (please), 14 Oct 2010, Ars Technica
- Letter which Novartis received from Webvention
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