Espacenet

https://worldwide.espacenet.com/
Espacenet was born 20 years ago on 19 October 1998. It has revolutionised access to worldwide patent information on the internet, offering easy-to-use features for searching patent information. Over time, Espacenet has continually extended its data coverage, and today it offers free access to more than 100 million patent documents from over 100 patent authorities. Ever since its launch, Espacenet has evolved continuously, always incorporating the latest technologies, and it will continue to do so in the future.

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