Hugo Black,
Aro Manufacturing Company v. Convertible Top Replacement Company…
“ When articles are not patentable and therefore are in the public domain, as these fabric covers were, to grant them a legally protected monopoly offends the constitutional plan of a competitive economy free from patent monopolies except where there are patentable 'Discoveries.' And the grant of a patent monopoly to the fabrics can no more be justified constitutionally by calling their sale by competitors 'contributory infringement' than by giving it an other label. ”
