Section 89 Expenses connected with patents
(1)
In calculating the profits of a trade, a deduction is allowed for expenses incurred—
(a)
in obtaining for the purposes of the trade the grant of a patent or the extension of a patent's term, or
(b)
in connection with a rejected or abandoned application for a patent made for the purposes of the trade.
(2)
This section does not apply to professions or vocations.