Modelling thresholds and volatility in US ecological patents
Ecological patents have been increasing steadily over time. This paper analyses trends and volatility in ecological patents in the USA from 1975 to 1997. Germany contributed more than 10% of the total US ecological patents, and is by far the strongest foreign performer. This paper estimates a set of...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
Elsevier SCI Ltd
2005
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/3159 |