| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 2 | |
| #2 | South Africa | 2 | |
| #3 | Australia | 1 | |
| #4 | Canada | 1 | |
| #5 | China | 1 | |
| #6 | EPO (European Patent Office) | 1 | |
| #7 | Spain | 1 | |
| #8 | India | 1 | |
| #9 | United States | 1 | |
| #10 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Dynamo-electric machines | |
| #2 | Reduction of greenhouse gas emissions |
| # | Name | Total Patents |
|---|---|---|
| #1 | Spence Geoffrey Martin | 8 |
| #2 | Spence Geoffrey M | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB8607012D0 | Energy conversion system | |
| ES8900031A1 | Energy conversion system | |
| ZA8602031B | Energy conversion system | |
| CN1013330B | Energy conversion system | |
| WO8604748A1 | Energy conversion system |