| # | Country | Total Patents | |
|---|---|---|---|
| #1 | EPO (European Patent Office) | 3 | |
| #2 | Mexico | 3 | |
| #3 | WIPO (World Intellectual Property Organization) | 3 | |
| #4 | Republic of Korea | 2 | |
| #5 | United States | 2 | |
| #6 | Australia | 1 | |
| #7 | China | 1 | |
| #8 | Colombia | 1 | |
| #9 | Czechia | 1 | |
| #10 | Ecuador | 1 | |
| #11 | Gulf Cooperation Council | 1 | |
| #12 | Panama | 1 | |
| #13 | Poland | 1 | |
| #14 | Taiwan | 1 | |
| #15 | Ukraine | 1 | |
| #16 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Environmental technology | |
| #3 | Audio-visual technology | |
| #4 | Semiconductors | |
| #5 | Optics | |
| #6 | Machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Duff William B Jr | 23 |
| Publication | Filing date | Title |
|---|---|---|
| CN101147310A | Induction machine rotors with improved frequency response | |
| US2005269892A1 | Induction machine rotors with improved frequency response | |
| MXPA05009393A | Electrical charge storage device having enhanced power characteristics. | |
| ZA200204643B | Method and circuit for using polarized device in AC applications. | |
| AU1958401A | Method and circuit for using polarized device in AC applications |