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Dallas-Fort Worth ranked No. 13 for patents out of 250 metros. Patents granted include: Amazon's mitigation of distributed denial-of-service attacks, American Vehicular Sciences' in-vehicle signage for displaying data about road signs, IBM's collaborative shopping across multiple channels using shared virtual carts, nMetric's bus stop systems, The Parking Genius' user validation system, Vivify's virtual rehabilitation system, Breghtway Construction Solutions' insulating panel for stucco exterior