There aren’t many pieces of technological design that simply can’t be improved upon, but the clamshell-style laptop computer case–introduced by Grid Systems in 1982–may be one of them. That’s why the vast majority of the portable computers built ever since have used it. But for more than a quarter-century now, inventors have been trying to top it, with folding screens, screens on stalks, folding keyboards, two-screen clamshells, tri-fold clamshells, and more. Most never even get off the drawing board. Herewith, a gallery of designs from Google Patents (click the filing dates to see the patents). There’s only one in here I might have considered buying, but on some perverse level I admire them all.