On June 19, 2000 British telecommunications giant British Telecom "discovered" that it owned the patent behind hyperlink technology (U.S. Patent Number 4,873,662), despite not exercising the patent for some 14 years. Why? Because it simply forgot about it among the 15,000 other patents it held, despite the fact that it runs out by 2006.
Recognizing that it just might have a claim on a core technology upon which the online world survives and thrives, what did BT do? It promptly sent out legal notices to nearly 20 of the largest U.S.