How many patents does
Changqing Downhole Technology Operation Company Of Cnpc Chuanqing Drilling Engineering Company have?
patents
443
families
328
granted
115
applications
328
CN
441
WO
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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Changqing Downhole Technology Operation Company Of Cnpc Chuanqing Drilling Engineering Company
Top ten assignees appearing on patents
2009 - 2018
2018
Changqing Downhole Technology Operation Company Of Cnpc Chuanqing Drilling Engineering Company
The top ten patent families are
|
Title of patent family (most common patent title) |
Family members |
Filing year |
|---|---|---|
| seawater-based instant fracturing fluid and preparation method thereof | 3 | 2013 |
| novel vegetable gum fracturing fluid jelly for oil well | 3 | 2013 |
| temperature-control-degradable crack diverting agent prepared by coating precrosslinked … 🛈 | 2 | 2014 |
| sealed swabbing liquid storage tank | 2 | 2014 |
| oil well horizontal well oil jacket simultaneous injection type double-sealing single-cl… 🛈 | 2 | 2014 |
| pressurized dragging down-hole blocking valve | 2 | 2014 |
| horizontal well volume fracturing tubular column and method based on conventional oil tu… 🛈 | 2 | 2014 |
| storage type underground tool torque measuring device | 2 | 2014 |
| down-hole pipe string flow nipple for preventing packer setting in process of running in… 🛈 | 2 | 2014 |
| fracturing pump truck with self-suction and self-discharge function | 2 | 2014 |