won asked for* the right to appeal a recently-lost patent case brought by Canadian firm i4i.
The company didn't get much credit for its claim to own Word patents until it won an injunction against Microsoft sales of Office 2007 and forced the software giant to patch the product before it could be legally sold.
Microsoft asked the Supreme Court on Friday to consider the case, look for errors and chuck it out, Reuters reports.
i4i told the newswire it had yet to hear from the court but was confident its patents would be upheld. i4i was awarded $290m in damages.
Microsoft insisted that the features, included in Office 2003 and 2007, were not covered by valid patents - but a recent appeal to the Patent Office failed.
*This story was updated - the Supreme court has yet to decide.®