Why technical effect matters
A list of differences between a claim and prior art may not be enough to answer an inventive-step objection. CNIPA’s explanation of the three-step approach stresses an objective assessment of the relationship between distinguishing features and their technical effects when identifying the technical problem actually solved.
Check the examiner’s comparison
Review what the closest prior art actually discloses, what the claim requires and whether the alleged differences are complete. Then use the description and available evidence to explain how the differences operate in the claimed solution and what technical effect they produce.
Test the combination, not just the labels
For example, if similarly named components in two devices are treated as interchangeable, compare their structure, function and operating environment, then examine whether the prior art provides a reason to make the proposed combination. Different names alone, or a bare allegation of hindsight, do not replace technical analysis.
Amendments and claim scope
Any proposed amendment must be checked against the application as originally filed, as well as its commercial effect on claim scope. CNIPA’s explanation of the 2025 Guidelines amendments emphasizes understanding the technical solution as a whole; features that do not contribute to solving the technical problem generally do not affect inventive step. The result depends on the particular facts.