Espacenet is one of the most comprehensive patent searching tool available for free. It is developed and provided by the EPO (European Patent Office). You have access to more than 130 million patent documents from over 100 countries, their national and regional patent offices.
It provides European, UK and worldwide coverage back to 1836. Full images of documents for many countries are available in Espacent, back to 1920. If you need earlier documents, you can check with the patent office of origin.
Espacenet
Searchable database of over 130 million UK, European and world-wide patents. In addition, images of the paper publications are available back to 1920 for the UK, US, EPO, WIPO, France, Germany and Switzerland. Compiled and maintained by The European Patent Office.
Espacenet will translate from English, French and German into 28 other EU languages (and vice versa).
Espacenet will also translate Chinese, Russian, Japanese and Korean into English, and vice versa.
GPI is a powerful tool that enables you to perform detailed searches in the EPO's worldwide bibliographic, legal event and full-text data sets
(NB! This is not a free product)
With the GPI you can: