| Title | No. | Registration Date |
Expiration Date |
|---|---|---|---|
| The upper part reinforcement structure of a steel pipe for base construction | 10-0458323 | 2004-11-15 | 2022-01-30 |
| Batch type cold mix recycling asphalt concretemanufacture apparatus and method | 10-0476686 | 2005-03-04 | 2021-08-30 |
| Bridge rail with soundproof | 10-0395683 | 2003-08-12 | 2020-12-13 |
| Flexible joint device of bridge for footpath | 10-0398963 | 2003-09-08 | 2020-12-13 |
| Dry apparatus of bridge slab in the winter season | 10-0373402 | 2003-02-11 | 2020-11-08 |
| Bridge constructive method and apparatus | 10-0390759 | 2003-06-27 | 2020-09-09 |
| Fixture for Rock Bolt | 10-0383453 | 2003-04-28 | 2020-07-19 |