While it's not the "rounded rectangle" iPad patent of fame, the iPhone 3G design patent is easily the second most-famous Apple design patent of record. It's called D618677, and it was a key issue in Samsung v. Apple "round one" - and by "key issue," I mean "reason for most of the remaining half billion dollars in damages." According to the USPTO, that iPhone design patent is now invalid on multiple counts of obviousness in light of prior art (in a technical, not literal, sense - two very different things).

Samsung was deemed to infringe this patent by a jury, and while it may well have were the patent valid, the USPTO is saying the point is moot - the patent itself is not eligible for protection.

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