Apple has been awarded the design patent for iOS' slide-to-unlock user interface, as well as the design for the original iPhone.
The U.S. Patent and Trademark Office approved Apple's No. D675,639 patent for "ornamental design for a display screen or portion thereof with a graphical user interface." Apple was granted a patent for the feature itself in 2011.
Apple also received approval for design patent No. D675,612, which relates to the "ornamental design of an electronic device." Specifically, it relates to the rounded corners situated on the iPhone.
Meanwhile, during December 2012, Apple won a design patent for the iPhone 4.