Soopat New World Search: ipr Patent Search: ipr.com/pages! Adv Search. action (view the full text and become a member)
Track patent search:/(toll platform)
The common feature of these platforms is that Chinese retrieval is flat, but English retrieval style is needed for retrieval, and the retrieval results are also displayed in English (English translation of German patent abstracts is provided).
If we don't consider the language relationship of the search page, we can also search for German patents through the website of the European Patent Office, which will be more accurate and comprehensive: https://register.epo.org/regviewer.