Section 23(1)

Subject to the following provisions of this section, no person resident in the United Kingdom shall, without written authority granted by the comptroller, file or cause to be filed outside the United Kingdom an application for a patent for an invention if subsection (1A) below applies to that application, unless— an application for a patent for the same invention has been filed in the Patent Office (whether before, on or after the appointed day) not less than six weeks before the application outside the United Kingdom; and either no directions have been given under section 22 above in relation to the application in the United Kingdom or all such directions have been revoked.

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Source: legislation.gov.uk · retrieved 2026-09-04