Summary

Portrait of Noah Haynes Swayne Noah Haynes Swayne Blake v. Robertson Robertson — Opinion of the Court

Where an original machine and an improvement upon it are both patented, neither patentee can use what does not belong to him, without the requisite authority from the owner. The appellants having embodied all the ideas of Blake's invention in their machine, the value which supplemented it, whether good or bad, is outside of the case, and cannot affect the result.
Source: Wikisource

Portrait of Noah Haynes Swayne Noah Haynes Swayne Blake v. Robertson Robertson — Opinion of the Court

The converging jaws, the revolving shaft, and the fly-wheel, are all wanting, as in the Hobbs & Brown machine. Instead, there is a cylindrical nut or pestle, having a partial rotary and crushing motion communicated to it by means of a lever attached thereto. The pestle rotates on a central axis within an eccentric concave. The work is done by this pestle. There is nothing of the vibratory motion of a movable jaw, alternately advancing and receding, as in the Blake invention.
The difference is not that of mere mechanical equivalents. It is radical, and goes to the essence of the organisms.
Source: Wikisource

Get perspective with Kwize: daily news enlightened by great literature