# Patent Classification (USPC/CPC) for Monitoring: A Practical Guide
2026-10-01

How USPTO patent classification systems (USPC and CPC) work, and how technology-class filtering makes patent monitoring far more precise.


## Why classification beats keywords: Searching patents by keyword is noisy: one concept, many phrasings. Classification assigns each patent to a technology code, so filtering by class captures the whole category, not a phrasing. For monitoring, a class filter answers 'what's new in this technology area?' precisely.
## USPC vs CPC: **USPC** (U.S. Patent Classification) is the legacy system the USPTO used for decades. **CPC** (Cooperative Patent Classification) is the modern joint US/European scheme and is far more granular. Most current monitoring and search happens in CPC, which aligns US and international classifications.
## A concrete pattern: To watch, say, photovoltaic mounting, you'd filter on a CPC class like H02S 20/xx. New grants or publications falling under that class become your feed. This is the difference between 'new solar patents' (vague) and 'new patents in CPC H02S 20/30+ tracking/mounting' (actionable).
## Using this in an agent feed: A structured feed exposes the class field on each record, so an agent can filter, cluster, and report new activity per class automatically. That is the core of competitive technical intel: not 'what did they patent' but 'what changed in classes I care about'.

## FAQ
- **What does CPC stand for?** Cooperative Patent Classification — the modern US-EPO joint scheme.
- **Is USPC still used?** Historic data uses it; current work is predominantly CPC.
- **How specific are CPC codes?** They go from broad sections (H) down to very narrow groups (H02S 20/32), enabling precise filtering.

Landing: https://patent-alerts.xyz/