Joseph McKenna, United States v. Allen (192 U.S. 543…
“ If the classification of the statute makes a distinction between the different kinds of inventions-between a process and an apparatus-and requires or permits a separate application for each, it would seem to follow irresistibly that an application and patent for one would not preclude an application and patent for the other, and the order of the application could not affect the right which the law confers. ”
