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Patent applications and USPTO patent grants for Guan; Ben.The latest application filed is for "weight-on-bit self-adjusting drill bit".
Patent | Date |
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Depressuriz od for downhole annulus drilling fluid Grant 10,815,743 - Liu , et al. October 27, 2 | 2020-10-27 |
Weight-on-bit self-adjusting drill bit Grant 10,233,695 - Guan , et al. | 2019-03-19 |
Weight-on-bit Self-adjusting Drill Bit App 20180363381 - GUAN; ZHICHUAN ;   et al. | 2018-12-20 |
Method and system for improving drilling speed by using drill speed vibration Grant 9,540,881 - Guan , et al. January 10, 2 | 2017-01-10 |
Method And System For Improving Drilling Speed By Using Drill Speed Vibration App 20140166368 - Guan; Zhichuan ;   et al. | 2014-06-19 |
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