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Technology Indicators Based on Patent Data: Three Case Studies. Phase 2 Report. Development and Application of Indicators

机译：基于专利数据的技术指标：三个案例研究。第二阶段报告。指标的开发与应用

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摘要

This study examines the theoretical links between patent activity and technological change, constructs and tests indicators based upon patent data, and applies the indicators to three distinct technologies--rotary engines, catalytic converters, and solar photovoltaics. The indicators, which include activity, immediacy, and corporate acceptance, reflect the level of inventive effort, the nature of the technology being developed, and the characteristics of the patent owners and inventors. For each technology, the indicators respond to changes occurring in or affecting the technology and tend to move in concert with one another. For example, during periods of high activity, the technical areas being developed are narrowly focused, and the inventive activities are more highly concentrated among fewer firms or assignees, even though there may be new entrants into an area. There is some indication that technological development may begin with a period of active, focused inventive effort, followed by a period of declining effort. Inventive effort then increases substantially above the initial period of development. Finally, the data suggests that the behavior and absolute level of particular indicators may differ when applied to various technologies.

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