Resuscitation of a patent application describes reviving an application that has been treated as withdrawn—typically due to a missed deadline or fee (an accidental withdrawal)—by applying to the UK Intellectual Property Office (UKIPO) or the Irish Patents Office to place it back in force. The term is descriptive rather than statutory. In the UK the formal remedy is reinstatement of an application under the Patents Act 1977 and Patents Rules 2007 (restoration applies to granted patents). In Ireland, a comparable remedy exists under the Patents Act 1992. For European patent applications, the European Patent Office provides re-establishment of rights.
Key features include strict time limits, payment of official fees, and a reasoned explanation with evidence of how the non-compliance occurred. In the UK, a request generally must be made within 12 months of the application being treated as withdrawn. Reinstatement is not automatic; the comptroller exercises discretion, and third-party intervening rights may arise during the lapse.
Usage and effect are broadly consistent across England & Wales, Scotland and Northern Ireland (UK-wide regime), with similar concepts in Ireland, though procedural details and deadlines differ. Successful resuscitation preserves the original filing and priority dates and allows prosecution to continue.