Important update: The deadlines related to authentication change and migration for EFS-Web and Private PAIR are being extended due to technical issues. We will announce the new deadlines when they are determined. Until then, you can still authenticate using either USPTO.gov accounts or PKI certificates.

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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.