Paragraph 1

For the purposes of so much of section 32(1) of the M1Patents Act 1949 as provides that a patent may be revoked on the grounds that the invention, so far as claimed in any claim of the complete specification, was secretly used in the United Kingdom before the priority date of that claim, no account shall be taken of any use, on or after the appointed day, of the invention by the Post Office or a person authorised by it, in consequence of the applicant for the patent or any person from whom he derives title having communicated or disclosed the invention directly or indirectly,—