Crosslinked high molecular weight polymers for use in water-based drilling fluids
US-10072197-B2 · Sep 11, 2018 · US
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Ma Guang Chang patents
Ma Guang Chang is listed as an inventor on 2 patents in our database. Major assignees and classification codes are summarized below.
| Metric | Value |
|---|---|
| Inventor | Ma Guang Chang |
| Total patents | 2 |
| First publication | Apr 13, 2017 |
| Latest publication | Sep 11, 2018 |
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Major assignees
Companies most often associated with this inventor's publications.
| Assignee | Patents |
|---|---|
| Cnpc Chuanqing Drilling Eng Co | 3 |
| Cnpc Usa Corp | 2 |
Top CPC classifications
Most common classification codes across this inventor's patents.
| CPC | Patents |
|---|---|
| C09K2208/12 | 2 |
| C08F2/32 | 2 |
| C09K8/24 | 2 |
| C09K8/035 | 2 |
| C08F220/56 | 2 |