TomTom has responded to Microsoft's patent suit by filing a patent claim of its own against the software maker.
Last month, Network Appliance sued Sun Microsystems, alleging that Sun's ZFS file system infringes on a number of NetApp patents. In a countersuit, Sun have returned fire, claiming that NetApp is in violation of 12 Sun patents.
Linux vendors Red Hat and Novell have been sued for patent infringement -- but not by Microsoft.
Despite a commercial future that depends on working with each other, the relationship between intellectual property firm and chipset vendor Qualcomm and handset maker Nokia has been fractious at best during recent years.
Network Appliance alleges Sun Microsystems' ZFS storage software violates seven of its patents, seeks permanent injunction.
Although Sun Microsystems recently made software patents available for use by open-source developers, OSI founder Bruce Perens cautions that the patent picture is turning increasingly murky.
Cornice, a maker of tiny disk drives, has counterpunched one of the industry giants that slapped it with patent-infringement lawsuits earlier this year.
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