Google Inc. has won a ruling that it doesn’t infringe Geotag Inc.’s crown jewel patent, easily one of the most litigated patents in U.S. history. But the ruling arrives too late to help hundreds of Google customers that have already succumbed to Geotag’s parent litigation machine.

In an April 10 summary judgment ruling first made public on Tuesday, U.S. District Judge Richard Andrews in Wilmington ruled that Google doesn’t infringe U.S. Patent No. 5,930,474. Geotag has asserted the location-based search patent against about 450 companies that use Google Maps or Microsoft Corp’s Bing Maps on their websites.