Du; Changlong
Patent Applications and Registrations
Patent applications and USPTO patent grants for Du; Changlong.The latest application filed is for "hard rock roadway and tunnel boring machine with actively rotating hobs".
- Du; Changlong - Jiangsu CN
| Patent | Date |
|---|---|
| Hard rock roadway and tunnel boring machine with actively rotating hobs Grant 11,199,092 - Jiang , et al. December 14, 2 | 2021-12-14 |
| Hard Rock Roadway And Tunnel Boring Machine With Actively Rotating Hobs App 20210231013 - JIANG; Hongxiang ; et al. | 2021-07-29 |
| Drilling and bursting heading machine Grant 10,233,755 - Liu , et al. | 2019-03-19 |
| Drilling and Bursting Heading Machine App 20180195388 - Liu; Songyong ; et al. | 2018-07-12 |
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