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This variation in Renton's design was held not patentable, and in any case Renton's firm was able to show that they had successfully installed the furnace at Newark in 1852-1853, while Martien could not satisfy the Commissioner that his installation had been made before September 1854. Priority was therefore awarded to Quimby, Brown, Renton, and Creswell. U.S. patent 16690, February 22, 1857.
Martien's U.S. patent was granted as 16690, dated February 24, 1857. The discussion in the Scientific American, which was mostly concerned with Martien's claim to priority, soon evoked a letter from William Kelly.
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