Canadian software company i4i says Microsoft Corp. (NASDAQ:MSFT) filed a petition with the U.S. Court of Appeals Friday asking it to re-hear a patent-infringement case between the two companies.

The move follows a Dec. 22 judgment by the court that upheld US$290-million judgment which found that Microsoft wilfully infringed upon i4i's patents.

"This next step of seeking a rehearing was anticipated. We continue to be confident that we will prevail," stated i4i chairman Loudon Owen.

"In the meantime, the injunction against Microsoft goes into effect in three days, on Monday, Jan. 11. We look forward to continuing to build i4i's business now that Microsoft is obligated to comply with the terms of the injunction."

In August, a Texas jury that found that i4i patents were infringed upon by the way Word 2003 and Word 2007 customize XML, or extensible markup language, which is used in encoding and displaying information.

The injunction prevents Microsoft from selling Word products that have the capability of opening an XML file containing custom XML.

Microsoft said last month it expected to have copies of Microsoft Word 2007 and Office 2007 with the feature removed available for sale by the injunction date and added that beta versions of Microsoft Word 2010 and Microsoft Office 2010 do not contain the technology covered by the injunction.