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Guided answer

Should I post-date my patent application?

Post-dating moves your application to a later date. It can buy time, but it never lets you add new matter, and it can cost you priority.

How the routes differ

Moderate complexity - several routes or missing facts

  • Amendment (sections 57 and 59): keeps the date; can only disclaim, correct or explain; cannot add matter.
  • Post-dating (section 17(1)): moves the date later by up to six months; does not allow new matter; intervening publications become prior art.
  • Cancelling the provisional (section 9(4)): dates the application from the complete specification.
  • Divisional (section 16): before grant, for an invention already disclosed; keeps the parent's date; no new matter.
  • Fresh application: new date, new matter allowed; your own earlier publications count against it.
  • Patent of addition (section 54): for an improvement in or modification of your own main invention; tied to the main patent's term.

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The honest answer usually needs someone to look at your actual disclosure, your timeline and the prior art. That is a conversation, not an article.