TY  - DATA
AU  - Jaffe,Adam B.
AU  - Trajtenberg,Manuel
TI  - Patents citations and innovations: a window on the knowledge economy 
U1  - 608 22
PY  - 2002///
CY  - Cambridge
PB  - MIT Press
KW  - Inventions
KW  - Patents
KW  - Technological innovations
N2  - Innovation and technological change, long recognized as the main drivers of long-term economic growth, are elusive notions that are difficult to conceptualize and even harder to measure in a consistent, systematic way. This book demonstrates the usefulness of patents and citations data as a window on the process of technological change and as a powerful tool for research on the economics of innovation. Patent records contain a wealth of information, including the inventors' identity, location, and employer, as well as the technological field of the invention. Patents also contain citation references to previous patents, which allow one to trace links across inventions. The book lays out the conceptual foundations for such research and provides a range of interesting applications, such as examining the geographic pattern of knowledge spillovers and evaluating the impact of university
ER  -