Blackberry filed a patent-infringement lawsuit against Nokia Oyj, demanding royalties on the Finnish company’s mobile network products that use an industry wide technology standard.

Blackberry moaned that Nokia’s Flexi Multiradio base stations, radio network controllers and Liquid Radio software are using technology covered by as many as 11 patents owned by BlackBerry.

It added that Nokia was encouraging the use” of the standard- compliant products without a license from Blackberry.

Blackberry did not say how much it wanted Nokia to cough up, but it would appear to be part of Chief Executive Officer John Chen is working to find new ways to pull revenue out of Blackberry’s technology.

He’s used acquisitions to add a suite of software products and negotiated licensing agreements to take advantage of the company’s thick book of wireless technology patents.

Nokia is aware of the inventions because the company has cited some of the patents in some of its own patent applications, BlackBerry said.

Some of the patents were owned by Nortel and Nokia had at one point tried to buy them as part of a failed bid for Nortel’s business in 2009, according to Blackberry.

BlackBerry was part of a group called Rockstar Consortium that bought Nortel’s patents out of bankruptcy for $4.5 billion in 2011. The patents were split up between the members of the group, which included Apple and Microsoft.

Since Blackberry contends that patents cover essential elements of a mobile telecommunications standard known as 3GPP, it has pledged to license them on fair and reasonable terms.