PTAB cancels Nike patent after Fed Circuit rebuke 05-03-2021 15-03-2016 The US Patent Trial and Appeal Board (PTAB) has cancelled redrafted claims of a Nike patent after a protracted eight-year dispute involving Adidas. In its decision, issued earlier this week, the PTAB ruled that a key claim in a 2012 Nike footwear patent was invalid due to prior art in a 2001 guide to knitting by David Spencer. The PTAB had reached the same conclusion before, but was overturned by the US Court of Appeals for the Federal Circuit because it had not given Nike a chance to state its case.