Schedule 1, paragraph 3(3)
PA 1977
Patents Act 1977 · United Kingdom
The period for which the term of an old existing patent may be extended under section 23 or 24 of that Act shall not exceed in the aggregate four years, except where an application for an order under the relevant section has been made before the appointed day and has not been disposed of before that day.
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Source: legislation.gov.uk · retrieved 2026-09-04