Cloud gaming firm Gaikai has been issued lawsuit papers which allege the company "has committed and continues to commit acts of infringement".
The complaint was filed on October 5th by the relatively unknown communications technology firm T5 Labs.
It was generally considered a matter of time before T5 Labs launched a legal complaint. In February, the company alleged that it had secured a cloud gaming patent that pre-dated that of rival gaming firm, OnLive.
T5 Labs has not explained why it has shifted its focus from OnLive and to Gaikai.
The company alleges that Gaikai is infringing on certain cloud technology patents.