BlackBerry Ltd on Wednesday filed a patent infringement lawsuit accusing Twitter of illegally using technology in its mobile messaging applications.

The lawsuit said Twitter wrongly sought to compensate for being a “relative latecomer” to mobile messaging by co-opting Blackberry’s inventions for such services as the main Twitter application and Twitter Ads, infringing six of the company’s patents.

Twitter “succeeded in diverting consumers away from BlackBerry’s products and services” and toward its own by misappropriating features that made BlackBerry “a critical and commercial success in the first place,” the complaint said.

Twitter declined to comment.

BlackBerry filed its complaint with the U.S. District Court in Los Angeles.

Last year, BlackBerry had also filed similar lawsuits against Facebook Inc and Snap Inc. These cases remain pending.

Since exiting smartphones in 2016, BlackBerry has shifted its focus to software to manage mobile devices and other areas including self-driving cars.