(a) Five years from the date of sealing of the patent or seven years from the date of the patent (i. e. the date of filing the complete specification), whichever period is shorter, for an invention claiming the method or process of manufacture of a substance, where the substance is intended or capable of being used as a drug, medicine or food.
(b)Fourteen years from the date of patent in respect of any other patentable invention.
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