It’s been a busy couple of weeks for Finnish tech company Nokia. In September Microsoft announced that it was purchasing the company’s handset business and licensing its portfolio of intellectual property. Now, the company is taking Taiwanese phone maker HTC to court in a patent infringement case.

Nokia has accused HTC of infringing on the “024 patent,” which covers technology designed to transmit voice and text messages. The claim relates to technology in four HTC devices that utilize chips made by QUALCOMM and Broadcom.

This suit, which was brought in a London court, represents the latest salvo in the war between the two tech companies. Nokia has filed more than 50 different infringement claims against HTC in Italy, Germany, the U.S. and the UK since May, 2012, Bloomberg reports.

Previously, the International Trade Commission ruled that HTC did indeed infringe on two Nokia patents that relate to the enhancement of cell phone transmission and reception. The devices in question also contained QUALCOMM chips.

Of course, HTC and Nokia are not the only tech companies engaged in brutal patent warfare. Apple has battled Google, as well as a number of patent trolls, Samsung and LG have faced off over display technology, and other tech companies have gotten in on the chaos as well.

As for Nokia, the biggest news concerning that company involved the Microsoft deal. In an effort to challenge Google and Apple, Microsoft decided to dive headfirst into the hardware business, opting to purchase Nokia’s handset business for $7.2 billion.