What is a C* classification challenge in patent examination?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-27 7 Rules 5 Related FAQs 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. 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. Related Rules from the Manual of Patent Examining Procedure 7 rules Collapse Promptly Address C* Classification Challenges Upon Amendment MPEP 909.01(c) Recommended C* Classification Generally Not Removed After First Action on Merits MPEP 909.01(c) Application Must Be Fully Classified on Receipt MPEP 909.01(b) Required Classifications Required for Examiner Assignment MPEP 909.01(b) Permitted Provisional Applications Not Classified or Assigned MPEP 909.01(b) Priority Claim Must Include DAS Code MPEP 2909 Permitted Receipt of Priority Claim and Certified Copy MPEP 214.03 Other Related FAQs 5 FAQs Collapse How does an amendment affect the classification of a patent application? What is the significance of the C* classification in patent examination? Can a patent application&#8217;s classification be changed after the first action on the merits? What are the key elements patent examiners check in amended applications? What is a C* classification challenge?