A US DISTRICT COURT JUDGE has ruled 13 patent claims invalid in Motorola's patent infringement lawsuit against Microsoft.
The patents in question deal with video encoding and decoding. The patent infringement lawsuit was filed in the US District Court for the Western District of Washington state in 2010.
Microsoft had asked Judge James Robart to dismiss the claims on Motorola patents 7310374, 7310375 and 7310376. Microsoft alleged that indefinite language used in Motorola's patent claims meant that they were invalid.
Judge Robart agreed with Microsoft's argument. According to the judge's summary of the ruling, Motorola was unable to prove the patents in question properly show infringements.
"The 'means for decoding' limitations claim[s] all corresponding structure under the sun by expansively defining the function in the specification as anything that decodes digital data," wrote Judge Robart in his summary of the case.
"This definition renders the 'means for decoding' limitation invalid for indefiniteness."
Google subsidiary Motorola Mobility is claiming that it deserves to be awarded as much as $4bn for the use of its patents, while Microsoft argues that the firm is only entitled to about $1m for the patents.
Prior to this ruling Judge Robart denied Motorola's requests for a sales ban on certain Microsoft devices that it alleges are infringing its patents. µ