Hewlett Packard has filed a patent infringement lawsuit against Xerox over touchscreen PC technology. The action is the third suit between the two rivals in six months.
HP claims Xerox has illegally used its patented technology for "touchscreen 2D emulation of 3D objects" in its Document Centre photocopier range and other copiers.
The plaintiff estimates that the technology represents $800 million a year in revenue to Xerox, and is seeking unspecified damages and an injunction to stop the copiers being sold until the matter is decided.
This action comes a few weeks after Xerox sued HP, claiming it is infringing patents in some inkjet printer models. HP is challenging the validity of that patent.
But it was HP that began the current battle when it filed suit six months ago alleging that Xerox was infringing its trademarks on its Xerox Laserjet cartridge packaging.
All three suits now await preliminary rulings.
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