Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10746605 | Visual efficacy measuring method for objects in different light environments | Jiangbi HU, Xiaoyu Li, Xiaojuan Gao, Xiaoqin Zhang, Guiping Guan +8 more | 2020-08-18 |
| 9297242 | Structure for gunpowder charge in multi-frac composite perforating device | Guoan Zhang, Xianhong Sun | 2016-03-29 |
| 9297243 | Composite perforation method and device with propping agent | Guoan Zhang | 2016-03-29 |
| 9027667 | Structure for gunpowder charge in combined fracturing perforation device | Guoan Zhang, Xianhong Sun | 2015-05-12 |
| 8960289 | Combined fracturing and perforating method and device for oil and gas well | Guoan Zhang, Xianhong Sun | 2015-02-24 |
| 8943944 | Structure for gunpowder charge in multi-frac composite perforating devices | Guoan Zhang, Xianhong Sun | 2015-02-03 |
| 8607856 | Cable head for petroleum logging | Guoan Zhang, Jiafu Zhang | 2013-12-17 |