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Intellectual Ventures, the Bellevue-based company led by former Microsoft technology chief Nathan Myhrvold, has filed suit against camera giant Nikon in federal court in Delaware, adding to a growing list of legal cases for IV.

“We have attempted to engage in licensing discussions with Nikon, but those discussions did not progress,” the company says in a blog post. “Filing a patent infringement complaint in the U.S. District Court of Delaware was the right business decision for us in order to protect the value of our patents.”

Here’s a copy of the suit and a list of the patents cited by Intellectual Ventures:

Intellectual Ventures this year has signed patent licensing deals with companies including American Express, Samsung, HTC, Rim, Pantech, SAP, Micron, and Wistron. It has filed suit against companies including Symantec, Trend Micro, Dell and HP. Recently IV sued Motorola, which is in the process of being acquired by Google, one of Intellectual Ventures’ investors.

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