| # | Country | Total Patents | |
|---|---|---|---|
| #1 | China | 11 | |
| #2 | WIPO (World Intellectual Property Organization) | 4 | |
| #3 | EPO (European Patent Office) | 2 | |
| #4 | Australia | 1 | |
| #5 | Canada | 1 | |
| #6 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Engines, pumps and turbines | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Pistons and sealings | |
| #2 | Pumps | |
| #3 | Shaping of plastics |
| # | Name | Total Patents |
|---|---|---|
| #1 | Yu Xiuming | 17 |
| #2 | Xiuming Yu | 3 |
| Publication | Filing date | Title |
|---|---|---|
| WO2009043227A1 | A sealing oil ring | |
| US2008252019A1 | Oil sealing ring | |
| CN101042191A | Sealed oil ring | |
| WO2007073684A1 | Sealing oil ring | |
| WO2006053489A1 | Oil sealing ring | |
| CN1776263A | Forced sealing oil ring | |
| CN1611760A | Forced sealing oil ring | |
| CN1548709A | Reinforced seal oil ring | |
| CN1239200A | Oil ring with forced sealing | |
| CN1191285A | Enforced seal oil ring | |
| CN1193073A | Forced-sealing oil ring | |
| WO9722792A1 | An oil sealing ring | |
| AU1137897A | An oil sealing ring | |
| EP1001156A1 | An oil sealing ring | |
| CN1211682A | Forceful sealing oil ring | |
| CN1077258A | Elastic stepless variable-speed drive | |
| CN1031885A | The device of reciprocating piston group and connecting rod | |
| CN1030466A | Leakless valve device |