Patent Renewal Rates under Different Renewal Period Schemes

by Bharath Venkat In order to keep a US patent in force, the US Patent & Trademark Office requires that patent owners make maintenance fees at years 3.5, 7.5 and 11.5 after grant. This is in addition to filing, search, examination and post-filing fees. Other patent issuing authorities use different rules. For the European Patent Office (EPO), maintenance payments must be made annually and cannot be pre-paid. For Japan (JPO) and the Korean Intellectual Property Office (KIPO), fees are due annually and can be prepaid. If the patent owner decides not to pay the maintenance fee, then the patent owner

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