Microsoft has asked a judge to dismiss an infringement suit targeting their Cortana digital assistant products, capitalizing on an earlier ruling that invalidated three patents at the center of the case.
Microsoft’s attorneys argued that the March 31st ruling from U.S. District Judge Richard G. Andrews of the District of Delaware destroyed the case from IPA Technologies Inc., as the American subsidiary of WiLAN tries to use the personal digital assistant technology underpinning Apple Inc.’s Siri.
Microsoft’s argument in its motion to dismiss was that the Andrews’ opinion extinguished all of IPA’s claims on the same three patents of which it accused Microsoft of infringing. In addition, the company claimed that a second set of patents were also invalid because of the Delaware judge’s ruling.
This action is in the middle of IPA’s overall battle to protect technology that it acquired from SRI International Inc.. That company had been developing personal digital assistants with a grant from the Defense Advanced Research Projects Agency. SRI spun off Siri Inc. in 2007 and granted the new IPA a non-exclusive license to the patent portfolio, according to IPA.