What is a C* classification challenge in patent examination?

A C* classification challenge is a process that may become necessary upon receipt of an amendment during patent examination. According to MPEP 909.01(c), “Upon the receipt of an amendment which makes a C* classification challenge necessary, steps should be taken promptly in accordance with the C* classification challenge outlined in MPEP § 909.01(d).” This suggests that certain amendments may require a reassessment of the application’s classification, potentially affecting how the application is processed and examined.

To learn more:

• C* classification
• patent amendment
• patent examination
• USPTO procedure