According to Patently Apple, Apple has acquired the “AirDrop” trademark from  Urban Airship, Inc.  Urban Airship, Inc is the company behind the popular “Airdrop Service” for Android developers.

On June 17, 2011, the US Patent & Trademark Office published documentation relating to the legal transfer of the “Airdrop” trademark from  Urban Airship to Apple. Urban Airship was only granted their certificate of registration last month which put a little pressure on Apple to acquire it, pronto.

There’s no word on a financial transaction disclosure, but Patently Apple also reports that  Apple filed for the “AirDrop” trademark in China and another one in Canada. These trademarks are related to the  Photo Stream feature of the new iCloud service which automatically uploads and syncs up to a thousand most recent photos across all iOS devices.

“AirDrop”  is a new feature in Lion that lets the user easily share files with other nearby users. Even though this feature isn’t available yet, Dropbox accomplishes the same task but isn’t as simple to use. OS X Lion is expected to be available sometime in July.