Espacenet is a good place to start your research. Go to https://worldwide.espacenet.com/ and have a look at the introduction video. This service is free and it has a dedicated forum espacenet-107/
There are more advanced EPO services to perform prior art searches like Global Patent Index (GPI).
Here you can post your opinions, ask questions and share information regarding GPI (Searching the EPO’s worldwide bibliographic, legal event and full-text data sets via the “Patent information services for experts” user interface).
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