(a) Subject to paragraphs (b) and (c), where a person resident in the State sells any patent rights and the net proceeds of the sale consist wholly or partly of a capital sum, that person shall, subject to this Chapter, be charged to tax under Case IV of Schedule D for the chargeable period in which the sum is received by that person and for successive chargeable periods, being charged in each period on the same fraction of the sum as the period is of 6 years (or such less fraction as has not already been charged).
(b) Where the person by notice in writing served on the inspector not later than 12 months after the end of the chargeable period in which the capital sum was received elects that the whole of that sum shall be charged to tax for the chargeable period in which the sum is received, it shall be charged to tax accordingly.
(c) Where the person by notice in writing served on the inspector not later than 12 months after the end of the chargeable period in which the capital su
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