With simple search you can search in simply way with an input mask. In the expert search more complex queries are possible. The German presentation below might be helpfully.
Suchergebnisse für Kategorie Simple search
Here you find explanations for the display of search results.
With this feature you see the search results with more details in a clearly arranged list. Especially the sketch and the description is displayed additionally.
Here we inform you how you save the search results.
The International Patent Classification IPC has a hierarchical structure.