BT had initiated the fight in late 2011 after it sued Google over a series of mobile patents which it said were being infringed in Android smartphones.
Google has now hit back with its own lawsuit and it citing four patents covering IP networking technologies that it says BT is infringing. Google is suing BT in both the USA and the UK.
"We have always seen litigation as a last resort, and we work hard to avoid lawsuits," Google spokeswoman Niki Fenwick told Reuters. "But BT has brought several meritless patent claims against Google and our customers - and they've also been arming patent trolls."
As a former state-owned monopoly with a sizeable research division, BT built up a formidable patent portfolio of its own, which was memorably demonstrated when the company pointed out that it owned the patent to the hyperlink used in websites, having patented it long before anyone knew of the concept.
BT eventually lost a test case against a USA based ISP in 2002 over that patent.
On the web: Reuters
Posted to: www.cellular-news.com/story/58611.php