Grace periods


The grace period allows for public disclosure of an invention (under certain conditions) without affecting the validity of a subsequent patent application (provided that a complete application is filed within 12 months of the disclosure).

Grace periods of one form or another apply in many countries, including Australia, the United States, Japan and Canada but do not apply in others including most European countries.

What the grace period covers

The grace period covers those circumstances where the applicant has inadvertently disclosed the invention before applying for a patent; for example, when they have discussed it with a contractor without a confidentiality agreement.

The grace period covers disclosures of an invention made by or with the consent of the applicant or patentee. The grace period may help a patent application succeed in cases where disclosure of an invention has been made by mistake or is ill timed.

Take care when using a grace period

A grace period should not be used as a general strategy for publishing an invention before filing a patent application.

The lack of a uniform grace period or grace period requirements around the world could mean patent applications that rely on grace period disclosures may be invalid in other countries. In addition, third parties who use an invention in the grace period and before a patent application is made, will retain their rights to use the invention.

How does the grace period work?

The grace period may be applied when the validity of your patent or patent application is being considered in examination or revocation proceedings.

You do not need to take any action to claim the grace period but if your invention is disclosed, you will need to ensure a complete application is filed in time.

Remember the grace period:

  • covers disclosures within a period of no more than 12 months before the filing date of a complete application in Australia.
  • will not provide an applicant with an earlier priority date.
  • has no retrospective effect - it only applies in relation to disclosures made on or after 1 April 2002.
  • is only applied to your patent or patent application in Australia.

Last Updated: 16/8/2011