How many patents does
Cnpc Group Western Drilling Engineering Company have?
patents
1,005
families
886
granted
115
applications
890
CN
1,001
WO
2
US
2
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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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Cnpc Group Western Drilling Engineering Company
Top ten assignees appearing on patents
2009
Cnpc Group Western Drilling Engineering Company
The top ten patent families are
|
Title of patent family (most common patent title) |
Family members |
Filing year |
|---|---|---|
| pitching sliding sleeve with ball seat capable of being taken | 4 | 2015 |
| torsion impact speed accelerating device | 4 | 2015 |
| conducting slip ring | 2 | 2010 |
| special faucet washing pipe compound sealing device for petroleum drilling machine | 2 | 2011 |
| expansion hanger | 2 | 2012 |
| electric plaster throwing device and use method thereof | 2 | 2012 |
| spring sheet type collar locator | 2 | 2015 |
| rotary sand washing head | 2 | 2015 |
| reciprocating circular blind plate device | 2 | 2015 |
| automatic throttle control device for pressure-controlled well drilling | 2 | 2012 |