Abgrenzung zu anderen Begrifflichkeiten 65 4.1.1 Bibliometrie … Patentinformationen und Patentinformetrie 185 8.1 Zahlen zum Patent (Anmeldungen/ Prüfungen …

This paper describes the database on U.S. patents that we have developed over the past decade, with the goal of making … database about 3 million patents and 16 million citations is now available on the NBER website. We discuss key issues that … arise in the use of patent citations data, and suggest ways of addressing them. In particular, significant changes over time …

lags; use of International Patent Classification (IPC) codes for grouping patents according to technology; treatment of … references to Non-Patent Literature (NPL); and the notion that many publications, from different patenting authorities, covering …

This paper describes the database on U.S. patents that we have developed over the past decade, with the goal of making … database about 3 million patents and 16 million citations is now available on the NBER website. We discuss key issues that … arise in the use of patent citations data, and suggest ways of addressing them. In particular, significant changes over time …