(1) For paragraph 81(1 )( c) of the Act, an application for a further patent must be made under section 29 of the Act.
(2) The Commissioner must not grant a patent of addition under
subsection 81(1) of the Act unless the date that would be the date of
the patent if that patent of addition were granted is the same as, or later
than, the date of the patent for the main invention.