USPTO Systems Status and Availability

Thursday Aug 13, 2020

Planned Events

​AOTW Maintenance

The USPTO will perform maintenance on the Assignments Historical Database (AHD) and the Assignments on the Web (AOTW) beginning at 11 p.m., Friday, August 14 and ending at 5 a.m., August 15 ET. 

The following systems will be unavailable during the maintenance period.

Additionally, Patent Assignment Search ( will be available but not able to access PDF during the maintenance period.