Apple received ownership of its unibody computer design on Tuesday, two years after it first introduced the design in its laptops.

Two of these patents are for its the MacBook Air, which was the first Apple notebook to use a combination frame and casing made out of a single block of aluminum.

Aside from external design, the other patent covers the Air's multi-touch glass trackpad, which has also since spread to other Apple portables. Its origins can be traced back to the iPhone

Apple originally applied for the patents in 2008 and 2009.

The other patent is for its MacBook Pro which was given a technological makeover in late 2008.

In October last year, Apple made the unibody transformation complete, when it took its low-end, plastic MacBook and gave it a unibody design. The result product was a half a pound lighter laptop and the inclusion of a LED display with 7 hours of battery life.

Meanwhile, Apple filed a lawsuit against rival handset maker HTC over the alleged infringement of 20 patents related to the iPhone's user interface.

The case, filed with the U.S. District Court in Delaware and the U.S. International Trade Commission (ITC), states that HTC infringes on Apple patents connected to its iPhone hardware, underlying architecture and interface.