Apple is facing a second lawsuit over technology used in the iPad. EMG Technology has added the iPad to its previously filed patent infringement lawsuit against Apple, which is currently pending in the U.S. District Court for the Eastern District of Texas.

The suit, which doesn't go to trial until Sept. 12, 2011, alleges that the touchscreen browser in Apple's products violate EMG's patents related to navigating Internet mobile Web sites and applications.

The company alleges Apple's iPad, iTunes Store, iPhone, iPod Touch and Apple TV all violate its patents. EMG says it filed the patents in question in 1999, years before Apple filed its mobile patents.

EMG's move came one week after Elan Technologies filed a complaint with the International Trade Commission alleging that Apple's iPad, iPhone, iPod Touch, MacBook and Magic Mouse products violate its patent on multi-touch technology.

In late 2008, Elan won a dispute over its multi-touch technology when a judge ruled that Synaptics had violated its patent.

Apple sold more than 300,000 iPads in the U.S. as of midnight April 3. The sales included deliveries of pre-ordered iPads to customers, deliveries to channel partners and sales at Apple retail stores.

Additionally, Apple said that iPad users downloaded more than 1 million apps from Apple’s App Store and more than 250,000 eBooks from its iBookstore during the first day.

“It feels great to have the iPad launched into the world – it’s going to be a game-changer,” said Apple CEO Steve Jobs. “iPad users, on average, downloaded more than three apps and close to one book within hours of unpacking their new iPad.”

Apparently iPads are still available as of this morning. A sales representative from Apple’s New York City location at Fifth Avenue said that store still had 32 GB and 64 GB Wi-Fi models in stock.

Analysts’ estimates hovered right around 700,000 iPad units sold during the whole weekend. Sales forecasts for 2010 ranged from between 5.5 million and 7.1 million units.

– Wireless Week’s Andrew Berg contributed to this report

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