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@hippy
http://www.slowtwitch.com/Tech/HED_s_Toroidal_2.0_Patent_5646.html
"This new patent (images from the patent are above and below), filed for in 2009 and finally granted after a long process, might be called Toroidal 2.0. What's intriguing is that it's not just a product being patented. It's a product plus a thing you attach to the product, i.e., the tire, that together create a shape that forms the basis of the patent. The patent isn't simply a product; it's both a product and a math problem."
"This new patent could cover a significant number of aero wheels in the market. There are many aero rims made in widths of 25mm and greater. Do prospective infringers believe Toroidal 2.0 is an enforceable patent? Unknown by us as of this writing. The patent was granted on November 18, 2014 (this public announcement was made congruent with the Specialized license deal). HED reports knowing of no objections since to its patent since its granting. Objections could still be forthcoming."