Information transmission apparatus for logging while drilling
US-9816327-B2 · Nov 14, 2017 · US
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Yan Guoxing patents
Yan Guoxing is listed as an inventor on 2 patents in our database. Major assignees and classification codes are summarized below.
| Metric | Value |
|---|---|
| Inventor | Yan Guoxing |
| Total patents | 2 |
| First publication | Jun 4, 2015 |
| Latest publication | Nov 14, 2017 |
Notable patents
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Major assignees
Companies most often associated with this inventor's publications.
| Assignee | Patents |
|---|---|
| China Nat Petroleum Corp | 2 |
| Cnpc Drilling Res Inst | 2 |
| Beijing Petroleum Machinery Factory | 2 |
Top CPC classifications
Most common classification codes across this inventor's patents.
| CPC | Patents |
|---|---|
| F16L11/127 | 2 |
| E21B17/028 | 2 |
| E21B47/12 | 2 |
| E21B47/122 | 2 |
| E21B17/003 | 2 |