Priority Country Field (PRICN)
If you want to find patents where the earliest member of the patent's simple family is from a certain country, use the PRICN field code.
This is a funny little field, but it can be useful when you need it. And we have it, so feel free to use it.
Consider this: ISD:2013 NOT PRICN:US
This says of all the granted patents in 2013, which have priorities from countries other than the US? Would you believe that more than a third of US grants in 2013 have priorities from previously filed non-US applications. It just goes to show you how truly global the patent system is!
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