INPADOC, which stands for International Patent Documentation, is an international patent collection. The database is produced and maintained by the European Patent Office (EPO). It contains patent families and legal status information, and is updated weekly.

The INPADOC database, which is publicly accessible, provides information about patent families, i.e. corresponding patent applications, i.e., patent applications in different countries which claim the same priority and which normally disclose the same invention. It also provides information concerning the legal status of patent applications and patents in those countries which report status changes.

(from http://en.wikipedia.org/wiki/INPADOC)