| # | Country | Total Patents | |
|---|---|---|---|
| #1 | WIPO (World Intellectual Property Organization) | 6 | |
| #2 | EPO (European Patent Office) | 5 | |
| #3 | China | 3 | |
| #4 | India | 1 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Electrical machinery and energy | |
| #3 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Rotary-pistons | |
| #2 | Rotary pistons | |
| #3 | Non-positive-displacement pumps | |
| #4 | Dynamo-electric machines | |
| #5 | Refrigerators |
| # | Name | Total Patents |
|---|---|---|
| #1 | Tang Yan | 14 |
| #2 | Yan Tang | 2 |
| Publication | Filing date | Title |
|---|---|---|
| CN101975160A | Double-screw liquid pump | |
| CN102022138A | Screw expanding power generating device | |
| CN101979880A | Screw compressor |