The US Patent & Trademark Office approved and published Apple's trademark for 'iAd' today under registration number 4,305,923, reports Patently Apple.
Apple originally filed their trademark application 21 months ago on June 21, 2011. Apple's iAd was created after their acquisition of Quattro Wireless in March 2010 and officially announced as a new service during Apple's WWDC in June 2010.
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