Patent Classification Explorer
@patentclassificationexplorer.com
Browse, compare and understand 254,249+ CPC and 80,145+ IPC patent classification codes. Explore hierarchies, view differences between systems, and learn what each code means.
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Patent Classification Explorer's Brand Colors
Hex Code
Color name
RGB
HSL
CMYK
#2969B4
Cerulean Blue
41, 105, 180
212, 63, 43
77, 42, 0, 29
#0F0F0F
Cod Gray
15, 15, 15
0, 0, 6
0, 0, 0, 94
#EEC68B
Chalky
238, 198, 139
36, 74, 74
0, 17, 42, 7
About Patent Classification Explorer
Patent Classification Explorer is a free online tool for navigating and understanding the International Patent Classification (IPC) and Cooperative Patent Classification (CPC) systems. It helps researchers, inventors, and other users explore more than 254,000 CPC codes, 80,000 IPC codes, and thousands of catchword keywords. Visitors can search by code or keyword, browse classification hierarchies, switch between systems, and compare their differences through a side-by-side Diff view. Code pages provide descriptions, hierarchy context, and cross-system mappings.
The platform also offers patent insights, including global filing statistics, geographic and technology trends, top applicants, and emerging areas. Its interactive Patent Universe presents CPC codes in a navigable 3D visualization. Users seeking a suitable classification for an invention can describe it in plain language using the AI Classification Suggest feature. Educational guides and frequently asked questions explain classification structures, code formats, and distinctions between IPC and CPC. The site draws classification data from WIPO and the EPO and USPTO, which jointly manage the CPC, and reflects the stated 2026.01 release.
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