How do I obtain my confirmation number when submitting a PCT Application?

If filing through EFS-Web:

Your confirmation number will be displayed on your acknowledgment receipt.

If filing on paper:

Contact the PCT Helpdesk by phone at (571) 272-4300

or

Contact the Patent Electronic Business Center by phone at: 1-866-217-9197 (toll free) or 571-272-4100 (local)