Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7475972 | One-way valve, valve unit assembly, and ink cartridge using the same | Li Yu | 2009-01-13 |
| 7246891 | Ink cartridge for a printer | Li Yu | 2007-07-24 |
| 7175264 | Device for continuously supplying ink under constant pressure | Jin Benyou | 2007-02-13 |
| 6935730 | One-way valve, valve unit assembly, and ink cartridge using the same | Li Yu | 2005-08-30 |
| 6929357 | Ink cartridge having bellows valve, ink filling method and apparatus used thereof | Li Yu | 2005-08-16 |