What tool is used to track Classification Challenges?

This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.

The USPTO uses the Classification Allocation Tool (CAT) to track and manage Classification Challenges. According to MPEP 909.01(d):

“SPEs and examiners must use the Classification Allocation Tool (CAT) classification challenge pages which create a record of the classification challenge history of each application and facilitates tracking of classification challenges of applications.”

The CAT serves several important functions:

• Creates a record of classification challenge history for each application
• Facilitates tracking of classification challenges
• Provides a centralized platform for submitting and reviewing challenges

By using this tool, the USPTO ensures a systematic and traceable process for managing Classification Challenges.