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

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