Toronto software company i4i says it has another legal victory over Microsoft Corp. in its patent infringement dispute.

I4i says a three-member panel of the U.S. Court of Appeals has again affirmed a lower court decision again in its favour.

I4i chairman Loudon Owen says the case, which has been going on since 2007, still isn't over.

Owen says i4i is waiting to hear if the Court of Appeals will grant Microsoft's request to have all 12 appeal court judges hear the case.

Owen also says he expects the case could end up in the U.S. Supreme Court.

The patent infringement case involves some versions of Microsoft Word 2003 and Word 2007 that use i4i's technology to process electronic documents.

Patent infringement cases are common in the tech world and can take years and millions of dollars to resolve.