Section 26: Patent not to be impugned for lack of unity
Provisions as to patents after grant.
No person may in any proceeding object to a patent or to an amendment of a specification of a patent on the ground that the claims contained in the specification of the patent, as they stand or, as the case may be, as proposed to be amended, relate;
(a) to more than one invention, or
(b) to a group of inventions which are not so linked as to form a single inventive concept.