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40.—(1) The registrar may certify any day as an interrupted day where—
(a)there is an event or circumstance causing an interruption in the normal operation of the Patent Office; or
(b)there is a general interruption or subsequent dislocation in the postal services of the United Kingdom.
(2) Any certificate of the registrar made under paragraph (1) shall be posted in the Patent Office and advertised in the journal.
(3) The registrar shall, where the time for doing anything under these Rules expires on an interrupted day, extend that time to the next following day not being an interrupted day (or an excluded day).
(4) In this rule—
“interrupted day” means a day which has been certified as such under paragraph (1); and
“excluded day” means a day specified as such by rule 46.