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Facebook has turned to familiar counsel to defend a high-profile patent attack by BlackBerry Ltd.
Cooley partners Heidi Keefe, Mark Weinstein and Michael Rhodes say that four of the nine BlackBerry patents, asserted in March against Facebook messaging and notification technology, are eligible for patent protection under Section 101. The same triumvirate has represented Facebook in virtually all of its patent litigation.
source: https://www.law.com/therecorder/2018/06/11/facebook-fires-back-at-blackberry-says-messaging-patents-arent-eligible/