How many patents does
Zhanjiang Branch Of China National Offshore Oil Corporation have?
patents
655
families
547
granted
108
applications
547
CN
655
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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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Zhanjiang Branch Of China National Offshore Oil Corporation
Top ten assignees appearing on patents
2009 - 2018
2009
2018
Zhanjiang Branch Of China National Offshore Oil Corporation
The top ten patent families are
|
Title of patent family (most common patent title) |
Family members |
Filing year |
|---|---|---|
| method for matching far-and-near offset-distance stacked profile phase frequencies | 2 | 2010 |
| gas-injection and water-drainage sealing mechanism under pulling state | 2 | 2015 |
| temperature-resistant and salt-resistant filtrate reducer for drilling fluid | 2 | 2015 |
| special tool for deep water test depth correction | 2 | 2015 |
| method for cleaning high-density drilling fluid mud cakes | 2 | 2015 |
| high temperature high pressure horizontal well completion pipe string with middle shut-i… 🛈 | 2 | 2015 |
| membrane tensioning device for blocking mud in wellhead area | 2 | 2015 |
| packer liquid capable of reducing carbon dioxide corrosion at high temperature under hig… 🛈 | 2 | 2015 |
| high-temperature-resistant high-density solid-phase-free formate drilling fluid system | 2 | 2015 |
| hydraulic separation tool for flanges | 2 | 2015 |