After Apple's patent infringement lawsuit against Samsung, there are already a couple of other developments on the Android-related patent litigation front.
For the sake of a complete record, let me mention that the ITC announced yesterday that it is investigating Microsoft's complaint against Barnes & Noble, FoxConn and Inventec. The investigation number is 337-TA-769. I will follow the process. This vote comes as little surprise. The previous smartphone-related ITC complaints I saw also resulted in formal investigations.
In December I reported on Hybrid Audio LLC's patent infringement lawsuit against HTC, Apple and Dell over U.S. Patent No. RE 40,281 on "signal processing utilizing a tree-structured array". Yesterday, Hybrid Audio LLC basically expanded its suit by naming additional defendants. In order to do so,
- Hybrid Audio LLC filed for voluntary dismissal without prejudice of its original suit (case no. 6:10-cv-00677, Eastern District of Texas; at that point, the defendants had not yet responded to the complaint or moved to dismiss or transfer it), and 
- filed a new suit (case no. 6:11-cv-00195, same federal court) over the same patent but with a longer list of defendants and, consequently, infringement accusations. 
These are the additional defendants and the products named as examples of allegedly infringing devices:
- Motorola Mobility: 
 "Xoom, Atrix, Droid 2, and Droix X"
 (all of those are Android-based)
- Nokia (two legal entities): 
 "5610 XpressMusic, 6650, 6133, 5310 XpressMusic, E7, and 6275i"
- Research in Motion (two legal entities): 
 "the BlackBerry smartphones"
- Samsung (three legal entities): 
 "R0, R1, P3, U5, S3, S5, and Q2 MP3 Players, Messager Cell Phone, JetSet Cell Phone, t249 Cell Phone, DVD Players, and Digital Photo Frames"
 (while those aren't Android-based, a settlement with Samsung would most likely also include any infringing Android-based Samsung products, and if Hybrid Audio proved infringement by Android-based devices in connection with HTC and/or Motorola, even a ruling may effectively affect Samsung's Android devices; otherwise, it would be easy for Hybrid Audio to launch a follow-on suit if necessary)
So Hybrid Audio LLC decided to take on some additional behemoths. I in my post on Hybrid Audio's original suit back in December I discussed that company's background and the patent in more detail than in this post, which is intended to be just a little update.
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