When is a C* classification challenge typically initiated?

A C* classification challenge is typically initiated upon the receipt of an amendment to a patent application. The Manual of Patent Examining Procedure (MPEP) 909.01(c) states: “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 indicates that the amendment must be of a nature that potentially affects the classification of the application, necessitating a review of its current classification.

To learn more:

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