Grace Period/Prior knowledge
Novelty of an invention is not destroyed by disclosure prior to the application or convention priority date without the patentee's knowledge or consent –
- if the matter disclosed was derived or obtained from the patentee
- if the invention had been used by the patentee or his predecessor in title in
Zambia prior to the application filing date or priority date, for the purpose of reasonable technical trial thereof and the application was filed with reasonable diligence after learning of the disclosure.
Patent applications are examined as to compliance with formal requirements.
Duration & Maintenance
A patent is valid for 16 years calculated from the filing date.
Renewal fees are payable and are calculated from the first anniversary of filing. A six months grace period is provided for payment of renewal fees, subject to payment of surcharges. If a renewal fee is not paid within this period, the patent lapses.
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.