# Patents Act 1977, Paragraph 17


For the purposes of this Schedule—
(a) issue is joined on a notice of opposition to the grant of a patent under section 14 of the 1949 Act when the applicant for the patent files a counter-statement fully setting out the grounds on which the opposition is contested;
(b) issue is joined on an application for the revocation of a patent under section 33 of that Act when the patentee files a counter-statement fully setting out the grounds on which the application is contested.

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Source: https://www.legislation.gov.uk/ukpga/1977/37/schedule/4/paragraph/17 (the official version)
Page: https://openlegislation.uk/patents-act-1977/schedule-4/paragraph-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.