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The USPTO will perform a Block Storage Migration for the following databases from midnight-5:30 a.m. ET on Thursday, April 30.
- Assignments Historical Database (AHD)
- Assignments on the Web (AOTW)
- Electronic System for Trademark Trials and Appeals (ESTTA)
- Integrated Quality System (IQS)
- Notice of Suit Processing System (NOSPS)
- Patent Center
- During this maintenance period, Patent Center will be unavailable. Please refer to our Filing Documents during an Outage page for other alternative filing methods.
- Patent Maintenance Fees Storefront
- Patent Trial and Appeal Case Tracking System (P-TACTS)
- Patent Examination Data Search (PEDS)
- Patent and Trademark Assignment System (PTAS)
Last updated: Thursday, Apr 30, 2026 at 5:30 AM ET
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