Copyright © Françoise Herrmann
What’s your favorite shoes? Birkenstocks are cult shoes, made in Germany, since 1774! (1774? Yes, that’s without a typo…!) This is a Birkenstock family-owned business for 230 years, toiling for perfection in the contour of soles. The first Birkenstock Patent, US3722113, was granted March 3, 1973 to Karl Birkenstock, for an Article of Footwear, which looked much like massage footwear in 1973....
An article of footwear has uppers which may [be] in form of straps, and a sole of yieldable elastomeric material which is provided at least on its upper and, according to some embodiments, on its lower surface with projections which extend substantially normal to the general plane of the respective surface. The projections may be of different length. [US3722113]
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