How does a patent examiner initiate a Classification Challenge?

To initiate a Classification Challenge, a patent examiner must follow these steps:

1. Access the Classification Allocation Tool (CAT) at https://cpc.uspto.gov/mcc/secure/index.html#/home
2. Complete the C* challenge form
3. Indicate all challenges to C* designations, including suggested additions
4. Provide an explanation for each challenge

As stated in MPEP 909.01(d):

“Every challenge must also be accompanied by an explanation as to why each C* designation should be added or removed.”

This process ensures that all classification challenges are well-documented and justified.

To learn more:

• CPC
• Classification Challenge
• Patent Examination
• USPTO
• CAT