Form

Request to extend a prescribed time limit

Request to extend a prescribed time limit to a period prescribed by Patents Rules.

From:
Intellectual Property Office
Published
29 April 2014
Last updated
1 April 2026 — See all updates

Documents

Request to extend a prescribed time limit (Form 52)

PDF, 104 KB, 4 pages

Details

You can either:

  • request a two month extension (where no such request has been made previously) to a time period prescribed by the rules listed in part 2 of Schedule 4 of the Patents Rules, or
  • request the comptroller to otherwise extend (or further extend) a time period prescribed by the rules listed in part 2 of Schedule 4 of the Patents Rules

Where the request is made under the second bullet point above you must give us evidence supporting the grounds for the request when you apply or as soon as possible afterwards (unless the office otherwise directs).

If the time period you wish to extend appears in part 3 of Schedule 4 of the Patents Rules you may request an extension of two months to these periods under the provisions of (i) above (rule 108(2)). Further extensions for these time periods are available under rule 108(3) however you should contact the office for advice on when these extensions are available.

Cost

£175.

Updates to this page

Published 29 April 2014
Last updated 1 April 2026 show all updates

  1. Fees updated for 1 April 2026.

  2. A new end page has been added. This contains a checklist and sending instructions. Supporting text added to questions that required further clarification.

  3. Form PF52 fee sheet updated.

  4. Zero fees ended and normal fees resume from 1st April 2021.

  5. E-mail address for sending the completed form has been added.

  6. Details of the costs have changed.

  7. Patent Form 52: Data Privacy added.

  8. First published.

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