LST Director Mark Lemley filed an amicus brief for technology companies (Intel Corporation, IBM Corporation, Google Inc., Micron Technology, Inc., and Microsoft Corporation) in Philips v. AWH. They argued "that the public notice function of patents is best served by focusing first on the language of the claims construed in light of the specification and prosecution history of the instant patent and related cases. Courts should resort to extrinsic evidence such as dictionaries only in cases of ambiguity in the intrinsic evidence."
Should Judges use extrinsic evidence in deciding patent diputes?
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