Motorola has been involved in a lot of high profile litigation recently. The company also recently sued, and has been sued in return by Apple over technologies in a range of products, including smartphones and touchscreens.

Analysts say much of the lawsuit activity is competitive and aimed at Android because the mobile software has gained popularity so quickly.

Motorola's smartphone sales rose to 3.8 million in the third quarter from 2.7 million in the second quarter, partly due to the success of its Droid X smartphone, an Android-based handset.