The steam engine is widely regarded as the icon of the Industrial Revolution and a prime example of a ‘General Purpose Technology,’ and yet its contribution to growth is far from transparent. This Paper examines the role that a particular innovative design in steam power, the Corliss engine,...

This paper explores the patterns of citations among patents taken out by inventors in the U.S., the U.K., Francc. Germany and Japan. We find (I) patents assigned to the same firm are more likely to cite each other, and come sooncr than other citations; (2) patents in the same patent class are...

This empirical analysis focuses on the impact of the economic cycle on firms' ability to sustain cooperative behavior within an explicit cartel agreement that existed during the interwar period in the Northern French coalfields. The basic model is based on Bresnahan (1982) and adapted to the...

This paper explores changes in university patenting behavior between 1965 and 1988. We show that university patents have increased 15-fold while real university research spending almost tripled. The causes of this increase are unclear, but may include increased focus on commercially relevant...

History and theory alike suggest that General Purpose Technologies (GPT's), such as the steam engine or electricity, may play a key role in economic growth. In a previous paper (Helpman and Trajtenberg, 1994) we incorporated this notion into a Grossman-Helpman growth model, and explored the...

We develop a model of growth driven by successive improvements in 'General Purpose Technologies' (GPT's), such as the steam engine, electricity, or micro-electronics. Each new generation of GPT's prompts investments in complementary inputs, and impacts the economy after enough such compatible...

Between 1965 and 1992 university patenting increased 1500%, while all patenting increased less than 50% and patents granted to US citizens remained constant. Because universities are dedicated to the principle of knowledge dissemination, knowledge transfer to the private sector is probable....

A survey of recent patentees was conducted to elicit their perceptions regarding the importance of their inventions, the extent of their communication with other inventors, and the relationship of both importance and communication to observed patent citations. A cohort of 1993 patentees were...

The extent to which new technological knowledge flows across institutional and national boundaries is a question of great importance for public policy and the modeling of economic growth. This paper develops a model of the process generating subsequent citations to patents as a lens for viewing...