Steve Jobs Used Patents to Get Bill Gates to Make 1997 Investment In Apple Forbes

Yahoo! isn't the first Silicon Valley company to assert its patents against others.

Steve Jobs did it to Microsoft back in 1997.

Source:
http://www.forbes.com/sites/ericjackson/2012/03/01/steve-jobs-used-patents-to-get-bill-gates-to-make-1997-investment-in-apple/