Patent pictures show Microsoft is still trying to build a dual screen device

It's eight years since we first heard rumors of Microsoft's Courier, a kind of dual-screen tablet that folded in half like a book, designed for note-taking and sketching and similar tasks. Courier was never officially acknowledged, but in 2010 word got out that it was cancelled.

But as patent applications show, Microsoft is continuing to work on the dual screen, folding concept. In January, a trifold design with a flexible screen and multiple hinges was patented. Over the last week, yet more new patents have been published, again showing devices with either multiple or folding screens, and in the very latest, complex hinging mechanisms. This time, the devices pictured have a single hinge and a two-part screen, much like the Courier concept.

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