Google's updated Prior Art Search

Recently Google has added a new service to its patent search service "Prior art search".

google patent

the blue button left to read this patent.

This tool tries to find relevant prior art to the subject patent. It is a good value addition by google though it is still in its early stages and results are not very good but it is likely to get better. There is the screen shot that how it works.
google patents 2
There is also a addition by google to its patent search engine. now EU patents can also be searched on google, hope google makes a excellent free prior art search database.

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