However, a few key financial institutions have embraced patents enthusiastically. This week, the Chicago Board Options Exchange has taken finance-patent wars to a new level. CBOE filed a lawsuit against a competing options exchange, International Securities Exchange (ISE), demanding $525 million for the infringement of three patents: US Patent Nos. 7,356,498, 7,980,457 and 8,266,044. The board asked for the first patent in 1999, at the height of the patent-everything craze, and the patents were issued between 2008 and 2011.