Inventor · disambiguated record
John Campbell
Also filed as: CAMPBELL JOHN · CAMPBELL JOHN ANDREW
6 granted patents·2 pending applications·34 citations·filing 1997–2024
78Inventor score
Top patents by PatentIndex Score
8 records- 0162US9394821B2System for improving the purifying liquid evaporation in an axially symmetric dosing module for an SCR deviceFPT MOTORENFORSCHUNG AG·Filed 2014·Granted Jul 19, 2016·2 cites·12 claims
- 0261US8752365B2Method for dosing an urea based reducing agent into a gas exhaust streamCAMPBELL JOHN·Filed 2010·Granted Jun 17, 2014·2 cites·9 claims
- 0357US9995194B2System for preventing the urea crystal formation within an exhaust gas after treatment systemFPT MOTORENFORSCHUNG AG·Filed 2014·Granted Jun 12, 2018·1 cites·13 claims
- 0454US8756918B2Dosing module for dosing an urea based reducing agent into a gas exhaust streamCAMPBELL JOHN·Filed 2010·Granted Jun 24, 2014·1 cites·11 claims
- 0554US5818269ADifferential current mode driverNAT SEMICONDUCTOR CORP·Filed 1997·Granted Oct 6, 1998·14 cites·28 claims
- 0653US5864228ACurrent mirror current source with current shunting circuitNAT SEMICONDUCTOR CORP·Filed 1997·Granted Jan 26, 1999·14 cites·5 claims
- 0752US2025314380A1Chimney systems with integrated waste heat recovery and related methodsENERVEX INC·Filed 2024·Application pending·0 cites
- 0845US2021325040A1Exhaust plume abatement systems and methodsENERVEX INC·Filed 2020·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when John Campbell 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 →