How ranges described in prior art trigger obviousness presumption

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Abstract: Some patents specify ranges to account for variability ¬— for example, a range of temperatures in which a process occurs. These types of patents can run into obviousness issues that can invalidate them if the range overlaps with ranges detailed in so-called “prior art.” This article explains why patentees in such cases aren’t totally out of luck, though, as they have the opportunity to rebut the presumption of obviousness. E.I. DuPont de Nemours & Co. v. Synvina C.V., No. 17-1977, Sept. 17, 2018, Fed. Cir.