patent
noun
the exclusive right granted by a government to an inventor to manufacture, use, or sell an invention for a certain number of years.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In other words, he makes two machines patentably different, but both embodying his main invention.
From Scientific American Supplement, No. 1178, June 25, 1898 by Various