rights. An addition of some useful thing to a
machine, manufacture or composition of matter.
2. The patent law of July 4, 1836, authorizes the granting of a
patent for any new and useful improvement on any art, machine
manufacture or composition of matter. Sect. 6. It is often very
difficult to say what is a new and useful improvement, the cases
often approach very near to each other. In the present improved
state of machinery, it is almost impracticable not to employ the
same elements of motion, and in some particulars, the same manner
of operation, to produce any new effect. 1 Gallis. 478; 2 Gallis.
51. See 4 B. & Ald. 540; 2 Kent, Com. 370.
Source: Bouviers Law Dictionary 1856 Edition