A Web contact Form is available by clicking on the "contact us" link at the top right corner of any WIPO DAS webpage (WIPO DAS Support contact form.)
is available by clicking on the "contact us" link at the top right corner of any DAS webpage.
Web Form contact: https://www3.wipo.int/contact/en/area.jsp?area=das is available by clicking on the "contact us" link at the top right corner of any DAS webpage.
What is WIPO DAS?
The WIPO Digital Access Service (“DAS”), available at https://www.wipo.int/das/en/, allows you to meet requirements for providing priority and similar documents in respect of participating Offices, without the need to obtain and send multiple certified paper copies of an application.
Instead, you ask the Office where you are claiming priority (“Office of Second Filing” or OSF) to download a copy of the document directly from a digital library, normally held by or on behalf of the Office where the earlier application was filed from which priority is claimed (“Office of First Filing” or OFF).
Security and Permissions
DAS provides a secure, trusted mechanism which allows Offices both to transmit and to access unpublished documents with confidence that the transmission has been permitted by the applicant or other authorized person.
It is essential that users properly understand what is required to give permission for this transfer. Because the system is designed to work between pairs of Offices, which may have no other working relationship, there are steps involved, which are different from, or additional to those in other priority document exchange systems in operation between certain Offices.
Current Participation
An up-to-date list of participating Offices is maintained on the WIPO DAS website at: https://www.wipo.int/das/en/news
As of November 1, 2025, there are 50 IP Offices participating in WIPO DAS. Other Offices are at various stages of preparation to join the system and are expected to join in the future.
Office-Specific Information
The participating Office’s websites also provide useful DAS information relevant to that particular Office. Please see “New Office Participation” on the WIPO website for announcements and details.
Scope of Documents
The service is intended for use with documents related to patents, utility models, industrial designs and trademarks.
At present, the service is operational for exchange of patent, utility model and design priority documents.
OFF Policy Differences
The scope of documents which can be made available also depends on the policy of the Office of First Filing.
Some Offices will allow any patent application filed at their Office to be entered into the system; other Offices offer the service only for a limited range of applications, such as those which have been filed in electronic form.
The relevant scope for each participating Office is outlined on WIPO’s website: https://www.wipo.int/das/en/participating_offices.html
The service will be extended to trademarks once participating Offices have made the necessary changes.
System Dependencies & Queuing
The DAS system depends on the IT systems of many different Offices, over which the International Bureau has no control.
If a library in one Office is temporarily unavailable, requests are queued until systems are restored.
This may cause delays, so it is important to register the application and take the required steps as early as possible.
Impact on Retrievals & Calendar
In extreme cases, the Office of Second Filing may be temporarily unable to retrieve your application, but you should still be given an opportunity to provide a paper certified copy if needed.
How to Recover Access Codes
If you lose your DAS access code for an earlier application filed at CN, EP, FI, JP, KR, NZ or US, please contact the Office where you filed that application.
If the application was filed at another participating Office, contact the PCT eServices Help Desk for the access code to be resent to the e-mail address you registered for DAS purposes.
On reception of your email, a ticketing system will issue an incident number and will send an automatic reply to the source email address like this:
In some cases the automatic initial message is not immediate as we have to the source email address to the "contact list" of verified addresses.
After that is done, for any new request, the notification will be automatically sent to your email.
After the ticket is issued, it will be assigned to an agent in out team to review and help with the resolution. If the information is not clear you will be contacted, otherwise you will receive a new notification when the issue is resolved like this:
The email will include a message with the details of how the issue was resolved.
