Geophone locating accuracy evaluation method and device
US-2020371195-A1 · Nov 26, 2020 · US
This page is not indexed by search engines while we improve data quality.
China Nat Petroleum Corp patents in 2020
China Nat Petroleum Corp was listed as an assignee on 4 patent publications in 2020.
| Metric | Value |
|---|---|
| Company | China Nat Petroleum Corp |
| Year | 2020 |
| Patents | 4 |
Patents
Representative publications for China Nat Petroleum Corp in 2020.
Cementing plug
US-10808496-B2 · Oct 20, 2020 · US
Method and device for determining overall measurement of seismic observation system repeatability
US-10809401-B2 · Oct 20, 2020 · US
Mechanical and hydraulic dual-effect expansion device for well drilling with expandable tubular technology
US-10641067-B2 · May 5, 2020 · US
Top CPC classifications
Most common classification codes for China Nat Petroleum Corp in 2020.
| CPC | Patents |
|---|---|
| E21B2034/007 | 1 |
| E21B2200/06 | 1 |
| E21B23/01 | 1 |
| E21B29/10 | 1 |
| E21B33/1208 | 1 |
Related pages
Navigate to parent entity pages.