Borehole wall resistance increasing apparatus for improving energy utilization rate of injection gas
US-11428065-B2 · Aug 30, 2022 · US
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Song Qingxin patents
Song Qingxin is listed as an inventor on 2 patents in our database. Major assignees and classification codes are summarized below.
| Metric | Value |
|---|---|
| Inventor | Song Qingxin |
| Total patents | 2 |
| First publication | Feb 11, 2021 |
| Latest publication | Aug 30, 2022 |
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Major assignees
Companies most often associated with this inventor's publications.
| Assignee | Patents |
|---|---|
| Petrochina Co Ltd | 2 |
Top CPC classifications
Most common classification codes across this inventor's patents.
| CPC | Patents |
|---|---|
| E21B43/08 | 2 |
| E21B43/168 | 2 |
| E21B43/12 | 2 |
| E21B17/00 | 2 |
| E21B34/063 | 2 |