Summary

Nathan Clifford Collar Company v. Van Dusen — Opinion of the Court

Evans now put himself into communication with different paper-makers, to get a sort of paper better suited for his purposes than any of the different sorts previously made; something which while it was paper and could be produced cheaply should yet have such a thickness, tenacity, pliability united with strength, and have moreover that polish of surface, and that exact bluish tint which is found in the best starched linen-as distinguished from yellowness and from dead white-which would deceive even critical observers who had no opportunity of judging otherwise than by the eye.
Source: Wikisource

Nathan Clifford Collar Company v. Van Dusen — Opinion of the Court

The reader will, of course, remember that the Patent Act authorizes the issue of a patent only when a person has invented or discovered some 'new manufacture, or some new and useful improvement thereof, not known or used by others;' and also that while authorizing in certain cases the reissue with an amended specification of an original patent, where the specification has been defective, the act contemplates that the reissued patent shall secure no other than 'the same invention' meant to have been secured by the original.
Source: Wikisource

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