How many patents does
Dagang Oilfield Group Company have?
patents
241
families
199
granted
42
applications
199
CN
241
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The report contains ten-year analysis with the following sections
- patent filing analysis
- worldwide filing analysis
- patent family analysis
- application analysis
- granted analysis
- classification analysis
- citation analysis
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Dagang Oilfield Group Company
Top ten assignees appearing on patents
2009 - 2018
2018
Dagang Oilfield Group Company
The top ten patent families are
|
Title of patent family (most common patent title) |
Family members |
Filing year |
|---|---|---|
| hydraulic sleeve scraper | 2 | 2012 |
| oil scraping device for sucker rod | 2 | 2014 |
| separate-layer sand blocking simultaneous production pipe string | 2 | 2013 |
| pdc drill | 2 | 2007 |
| snubbing controllable workover operation equipment and operation method thereof | 2 | 2013 |
| horizontal well gravel-packed string and pressure control valves thereof | 2 | 2012 |
| riser pipe construction technique of artificial island well drilling | 2 | 2007 |
| sand blasting device allowing fracturing sliding sleeve to be fished | 2 | 2012 |
| oil field water injection well deep sediment profile control method | 2 | 2014 |
| energy saving method for beam-pumping unit | 2 | 2014 |