Mr. Chief Justice TANEY delivered the opinion of the court.
The question presented in this case is a narrow one, and may be disposed of in a few words.
The plaintiff claims that he has invented a new and useful improvement in the art of manufacturing bricks and tiles; and states his invention to consist in using fine anthracite coal, or coal-dust, with clay, for the purpose of making brick or tile; — and for that only he claims a patent. And the only...
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