Remember Sisvel International? You know, that company that linked up with Apple and Siemens in order to engage on a full-on patent assault during CeBIT 2010? It’s back, and it’s snapping up 47 patent families comprised of more than 450 patents and applications originally filed by Nokia. We’re told that the patents and patent applications “cover technologies used in a wide range of mobile communications devices and services,” with over 350 of ‘em being called “essential” to second, third and fourth-generation communications standards, including GSM, UMTS / WCDMA and LTE. The balance of the portfolio — just in case you’re curious — consists of implementation patents including video encoding optimization technologies. Not surprisingly, the acquired patents remain subject to certain prior agreements and Nokia is licensed under the portfolio as part of the acquisition. Head on past the break for the official word.