Inventor · disambiguated record
Quangen Du
Also filed as: DU QUANGEN
6 granted patents·1 pending application·21 citations·filing 2011–2019
75Inventor score
Technology areasE21B
Top patents by PatentIndex Score
7 records- 0193US10502024B2Systems and techniques for controlling and monitoring downhole operations in a wellSCHLUMBERGER TECHNOLOGY CORP·Filed 2016·Granted Dec 10, 2019·13 cites·17 claims
- 0268US9863202B2Propellant energy to operate subsea equipmentSCHLUMBERGER TECHNOLOGY CORP·Filed 2014·Granted Jan 9, 2018·3 cites·20 claims
- 0368US9243478B2Piping system having an insulated annulusDU QUANGEN·Filed 2012·Granted Jan 26, 2016·5 cites·17 claims
- 0458US11274522B2Systems and techniques for controlling and monitoring downhole operations in a wellSCHLUMBERGER TECHNOLOGY CORP·Filed 2019·Granted Mar 15, 2022·0 cites·20 claims
- 0536US8978766B2Temperature compensated accumulatorNELLESSEN JR PETER·Filed 2011·Granted Mar 17, 2015·0 cites·16 claims
- 0633US10808493B2Packer system having lockable mechanismSCHLUMBERGER TECHNOLOGY CORP·Filed 2016·Granted Oct 20, 2020·0 cites·20 claims
- 0730US2013062069A1Accumulator having operating fluid volume independent of external hydrostatic pressureDU QUANGEN·Filed 2011·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Quangen Du files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →