Simple and Extended Patent Families
The International Patent Documentation Centre (INPADOC), the European Patent Office (EPO) and WIPO recognize the following definitions of simple and extended patent families:
Simple patent family: All patent documents have exactly the same priority date or combination of priority dates.
"Extended" patent family: All patent documents are linked (directly or indirectly) via a priority document belonging to one patent family. The extended families allow for additional connectors to link other than strictly priority date. These include: domestic application numbers, countries that have not ratified the Paris Convention, or if the application was filed too late to claim priority.
Read more about this topic: Patent Family
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