Patent applications are examined as to compliance with formal requirements.
Duration & Maintenance
A patent is valid for 20 years calculated from the filing date.
Renewal fees are payable annually. A six-month grace period is provided, subject to surcharges.
Patent must be worked within four years from date of filing or three years from date of grant, whichever period expires last. A compulsory licence may be granted if Patent is not worked in Zanzibar.