Abstract
December 1, 1671.—On Dec. 1, 1671, Prince Rupert was granted a patent for his new invention of “converting into steel all manner of edged tools, files, etc., forged and formed in soft iron, or any part of the said tools, after they are set, forged, and framed”. The patent was to run from May 6, the date of an earlier grant which had been surrendered. In connexion with the patent, Prince Rupert was authorised in the following January to administer an oath to “the several workmen, artificers, and persons concerned in the said arts, neither directly nor indirectly to divulge or make known to any person whatsoever, except his Majesty … the said arts or how they are used or with what instruments or materialls the same are made”.
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Calendar of Patent Records. Nature 124, 860 (1929). https://doi.org/10.1038/124860b0
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DOI: https://doi.org/10.1038/124860b0