Steve Jobs' patent for the UK plug?
google.com
google.com
If you compare power adapters for laptops between the UK and the US, the UK adapters typically have a three-prong socket whereas the US ones have a two-prong socket. This patent seems to cover a UK plug that fits a US power adapter socket.
If they've patented this I assume they've patented all the other global plugs that can be attached too.