Sections 54 to 56 deal with patents of addition.
An application may be for a patent in respect of any improvement in or
modification of a patented invention (known as main invention). The Controller
may grant the patent for the improvement or modification as a “patient of addition”
the term of the patent of addition shall run concurrently and terminate with
the main patent. No renewal fee is payable for the patent of addition so long
as the main patent remains in force.
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