The Registrar must revoke the registration of a trade mark if:
(i) a notice of opposition to the registration was filed in accordance with subsection 52(2); or
(ii) before the registration, a person applied in accordance with the regulations for an extension of the period for filing a notice of opposition to the registration; and
(b) the Registrar failed to take account of the opposition or application in deciding to register the trade mark; and
(c) the Registrar becomes aware of the failure within 1 month after the notice was filed or the application was made.
The revocation must be done within that month.
Note: If the Registrar becomes aware of the failure later, he or she may be able to revoke the registration under section 84A.