a claim to the machine,
to the process, to the screw, and to the alloy, would be
assigned to Metal-Working, Combined machines, and, if all
claims were allowed, cross-referenced to Bolt and
rivet-making processes, to Bolts, and to Alloys. If the
claim to any one or two of the subjects were eliminated,
the order of preference or superiority and the order of
cross-referencing would remain the same.

(29) Patents containing a plurality of claims for several different
statutory kinds of invention that are classifiable in different main
classes, and wherein the rule of relative intensiveness varies from the
order Machine, Art, Manufacture, and Composition of matter, may be
diagnosed and classified as directed in the following paragraphs (30 to
35).

(30) Where a patent contains claims for a process and for an apparatus
susceptible of use as an instrument in carrying out the process, but not
peculiar to that use, or for an apparatus adapted to carry out but one
step or only a part of the process, the process claim, being in this
instance the more intensive, would control the classification. (See Rule
28.)

Example: In a patent containing a claim for a process of
roasting ore and then collecting the fumes, and another
claim for a roasting furnace that is a mere
material-heating furnace, the process claim would control;
whereas, if one claim were for a method of roasting ores
consisting of stirring the ore, applying heat to the same,
and collecting the solids from the fumes, and the other
claim, were for a heating furnace having a stirrer and a
fume arrester, the apparatus claim would control. And if a
patent contained claims for a process of roasting ores, and
other claims for a furnace susceptible of use in carrying
out the process but equally useful in annealing glass or
steel articles, the process claim would control.

(31) Where a patent claims a specified article of manufacture or other
product, and also an instrument for making a part only of that specified
article or other product, the product claim, being more intensive,
should control the classification; so also in case of a claim for a
product and a claim for an instrument performing any minor act with
respect thereto. (See Rule 28.)

Example: Where a patent claims a particular construction of
a riveted joint, and also a tool for calking the rivet, and
where a patent claims a particular cons