After filing an US application how much time should the applicant wait to file a PCT application?

What are the benefits of filing early or late?

3 Answers 3


Ideal time is to file application is within 12 months from priority. Early filing sometimes speeds up examination.


One year is the maximum time permitted under the rules.

If your desire is to increase the market value of your patent application, you should file PCT as fast as possible.

If possible file PCT first and US later.

The reason for this is that for most US patent applications no action starts until about two years are passed so their is no way to asses their market value.

In contrast PCT gives you an opinion on the patentability of various claims within six to nine months of the filling.

The PCT report, being independent and treated with respect in most countries, will allow you to market the patent with a greater confidence.


Benefits of filing late (that is, at the 12 month date)

  • The costs of filing a PCT application are deferred.
  • You reserve the ability to skip the PCT stage if your circumstances change within the 12 month Convention period.

Benefits of filing early (that is, substantially before the 12 month date)

  • You may possibly get the international search report early. Possibly. It depends on your ISA, and whether they order applications by the filing date or the priority date. In the latter case, the search will be performed at a time irrespective of the filing date.

However, I should note that this benefit of filing early is more theoretical than anything else. Because the sole reason to file a PCT application is to defer when you need to make a decision about subsequent countries (or to defer the costs of those countries). Thus if you are looking to file a PCT application, you are not going to be in any particular hurry to proceed to grant. Thus the value in getting an ISR early is negligible.

You must log in to answer this question.