Editing Gore-Tex (section)

===Gore patent held valid in 1983===
In the 1970s [[Garlock Sealing Technologies|Garlock, Inc.]] allegedly infringed Gore's patents by using Cropper's machine and was [[lawsuit|sued]] by Gore in the [[Federal District Court]] of [[Ohio]]. The District Court held Gore's product and process patents to be invalid after a "bitterly contested case" that "involved over two years of [[discovery (legal)|discovery]], five weeks of trial, the testimony of 35 witnesses (19 live, 16 by deposition), and over 300 exhibits" (quoting the Federal Circuit). On appeal, however, the Federal Circuit disagreed in the famous case of ''Gore v. Garlock'', reversing the lower court's decision on the ground, as well as others, that Cropper forfeited any superior claim to the invention by virtue of having concealed the process for making ePTFE from the public. As a public patent had not been filed, the new form of the material could not be legally recognised. Gore was thereby established as the legal inventor of ePTFE.<ref name=GoreGarlock /><ref>{{cite book|last1=Bridges|first1=Jon|title=No 8 Rewired: 202 New Zealand Inventions that Changed the World|date=Sep 2014|publisher=Penguin Group|isbn=9780143571957}}</ref>