PKI authentication for EFS-Web and Private PAIR will be unavailable on May 22, starting at 12:01 AM and ending at 11:59 PM (ET). Additional outages will be scheduled. Authentication via verified accounts will continue to be available. Please see the USPTO Systems Status and Availability pagefor more information.


EFS-Web, Private PAIR, and Public PAIR will be unavailable beginning at 11:59 p.m., Friday, May 24th, and ending at 5:00 p.m., Monday, May 27th ET. Please visit USPTO Systems Status and Availability for more information. If you have questions, please contact the EBC at (866) 217-9197 or

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Full technical support for EFS-Web is available through the Patent Electronic Business Center (EBC) at 866-217-9197 (toll-free) or 571-272-4100 from 6 a.m. to 12 Midnight Eastern Time, Monday - Friday.