Page 6 -

Table of Contents

List of Figures ............................................................................................................................................. vi

List of Tables ............................................................................................................................................... vi

1 Introduction ........................................................................................................................................... 1

2 Analytical Approach ............................................................................................................................. 4
2.1 Patent Search ........................................................................................................................4
2.2 Patent Interrogation ..............................................................................................................5
2.3 Patent Value Definition........................................................................................................5
2.4 Regressions ..........................................................................................................................8

3 Analytical Insights .............................................................................................................................. 10
3.1 Historical Macro Sources of Clean Energy Inventive Activity .........................................10
3.2 Sources of Clean Energy Technical and Commercial Breakthroughs ...............................18
3.3 Breakthrough Sources ........................................................................................................22
3.4 Predicting Breakthroughs...................................................................................................28

4 Suggestions for Further Research .................................................................................................... 30

5 Conclusions ......................................................................................................................................... 32

References ................................................................................................................................................. 33

v