# The Patents (Supplementary Protection Certificates) Rules 1997, Paragraph 1: Duration of the certificate


The certificate shall take effect at the end of the lawful term of the basic patent for a period equal to the period which elapsed between the date on which the application for a basic patent was lodged and the date of the first authorization to place the product on the market in the Community, reduced by a period of five years.

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Source: https://www.legislation.gov.uk/uksi/1997/64/schedule/1/crossheading/13/paragraph/1 (the official version)
Page: https://openlegislation.uk/patents-supplementary-protection-certificates-rules-1997/schedule-1/crossheading-13/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.