MR. CHIEF JUSTICE FULLER delivered the opinion of the court:
Was a wood pavement "composed of blocks, each side having a single plain surface and one or more of the sides being inclined, and the blocks being so laid on their larger ends as to form wedge-shaped grooves or spaces to receive concrete or other suitable filling," patentable April 5, 1870, in view of the state of the art?
Chambers had, in 1824, described a pavement of pyramidal stones, twelve inches...
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