Inventor · disambiguated record
Stephen A. Campbell
Also filed as: CAMPBELL STEPHEN · CAMPBELL STEPHEN A · CAMPBELL STEPHEN ANDREW
34 granted patents·23 pending applications·949 citations·filing 1989–2025
98Inventor score
Top patents by PatentIndex Score
57 records- 0194US6936370B1Solid polymer fuel cell with improved voltage reversal toleranceJOHNSON MATTHEY PLC·Filed 2000·Granted Aug 30, 2005·103 cites·41 claims
- 0294US5976726AElectrochemical cell with fluid distribution layer having integral sealing capabilityBALLARD POWER SYSTEMS·Filed 1997·Granted Nov 2, 1999·83 cites·30 claims
- 0393US5672439AMethod and apparatus for reducing reactant crossover in an electrochemical fuel cellBALLARD POWER SYSTEMS·Filed 1995·Granted Sep 30, 1997·106 cites·24 claims
- 0492US5874182AMethod and apparatus for reducing reactant crossover in a liquid feed electrochemical fuel cellBALLARD POWER SYSTEMS·Filed 1997·Granted Feb 23, 1999·87 cites·19 claims
- 0590US6638650B1Method and apparatus for detecting transfer leaks in fuel cells and fuel cell stacksBALLARD POWER SYSTEMS·Filed 2000·Granted Oct 28, 2003·59 cites·35 claims
- 0689US6683011B2Process for forming hafnium oxide filmsUNIV MINNESOTA·Filed 2001·Granted Jan 27, 2004·53 cites·9 claims
- 0787US6475651B1Method and apparatus for detecting transfer leaks in fuel cellsBALLARD POWER SYSTEMS·Filed 2000·Granted Nov 5, 2002·32 cites·18 claims
- 0887US5863673APorous electrode substrate for an electrochemical fuel cellBALLARD POWER SYSTEMS·Filed 1996·Granted Jan 26, 1999·77 cites·40 claims
- 0983US6974647B2Fuel cell fluid distribution layer having integral sealing capabilityBALLARD POWER SYSTEMS·Filed 2002·Granted Dec 13, 2005·15 cites·23 claims
- 1083US6060190AElectrochemical fuel cell membrane electrode assembly with porous electrode substrateBALLARD POWER SYSTEMS·Filed 1998·Granted May 9, 2000·62 cites·34 claims
- 1180US6623707B1Monolithic catalyst dehydrogenation reactorCORNING INC·Filed 2000·Granted Sep 23, 2003·23 cites·27 claims
- 1279US7125820B2Non-noble metal catalysts for the oxygen reduction reactionBALLARD POWER SYSTEMS·Filed 2003·Granted Oct 24, 2006·14 cites·19 claims
- 1379US6074773AImpregnation of microporous electrocatalyst particles for improving performance in an electrochemical fuel cellBALLARD POWER SYSTEMS·Filed 1998·Granted Jun 13, 2000·50 cites·21 claims
- 1478US11329284B2Fine and ultrafine powders and nanopowders of lithium metal oxides for battery applicationsNANO ONE MAT CORP·Filed 2017·Granted May 10, 2022·1 cites·9 claims
- 1578US7032894B2Flow distributor for monolith reactorsCORNING INC·Filed 2001·Granted Apr 25, 2006·23 cites·8 claims
- 1677US2024409435A1Novel Intermediate Material Between Precursor and Cathode Active MaterialNANO ONE MAT CORP·Filed 2024·Application pending·0 cites
- 1776US9799893B2Catalyst support for fuel cellCAMPBELL STEPHEN A·Filed 2007·Granted Oct 24, 2017·3 cites·6 claims
- 1876US6350538B1Fuel cell with fluid distribution layer having intergral sealing capabilityBALLARD POWER SYSTEMS·Filed 1999·Granted Feb 26, 2002·39 cites·28 claims
- 1974US11121370B2One-pot synthesis for lithium ion battery cathode material precursorsNANO ONE MAT CORP·Filed 2018·Granted Sep 14, 2021·1 cites·55 claims
- 2073US11735712B2Phosphate stabilized lithium ion battery cathodeNANO ONE MAT CORP·Filed 2021·Granted Aug 22, 2023·0 cites·25 claims
- 2173US11616230B2Fine and ultrafine powders and nanopowders of lithium metal oxides for battery applicationsNANO ONE MAT CORP·Filed 2022·Granted Mar 28, 2023·0 cites·69 claims
- 2273US4845542AInterconnect for layered integrated circuit assemblyUNISYS CORP·Filed 1989·Granted Jul 4, 1989·41 cites·11 claims
- 2370US12355063B2Battery with spinel cathodeNANO ONE MAT CORP·Filed 2021·Granted Jul 8, 2025·0 cites·95 claims
- 2470US12077452B2Intermediate material between precursor and cathode active materialNANO ONE MAT CORPL·Filed 2022·Granted Sep 3, 2024·0 cites·38 claims
- 2570US2025300167A1Battery with Spinel CathodeNANO ONE MAT CORP·Filed 2025·Application pending·0 cites
- 2669US6122440AOptical heating device for rapid thermal processing (RTP) systemUNIV MINNESOTA·Filed 1999·Granted Sep 19, 2000·35 cites·18 claims
- 2766US2024097225A1Process for Efficient Recycling of Cathode Active MaterialsNANO ONE MAT CORP·Filed 2023·Application pending·0 cites
- 2865US11018331B2Phosphate stabilized lithium ion battery cathodeNANO ONE MAT CORP·Filed 2017·Granted May 25, 2021·0 cites·17 claims
- 2962US2022064019A1Alternative One-Pot Process for Making a Cam Precursor Using Metal FeedstocksNANO ONE MAT CORP·Filed 2021·Application pending·0 cites
- 3061US6896792B2Method and device for improved catalytic activity in the purification of fluidsBALLARD POWER SYSTEMS·Filed 2002·Granted May 24, 2005·4 cites·39 claims
- 3160US6548202B2Carbon-supported catalysts for fuel cellsBALLARD POWER SYSTEM INC·Filed 2001·Granted Apr 15, 2003·6 cites·27 claims
- 3260US2021359300A1Alternative Method for Making Lithium Battery Cathode MaterialsNANO ONE MAT CORP·Filed 2020·Application pending·0 cites
- 3359US2009053575A1Supported catalysts for the anode of a voltage reversal tolerant fuel cellKNIGHTS SHANNA D·Filed 2008·Application pending·0 cites
- 3459US2021376320A1One-Pot Synthesis for Lithium Ion Battery Cathode Material PrecursorsNANO ONE MAT CORP·Filed 2021·Application pending·0 cites
- 3558US2023238516A1Method for Preparing Lithium Metal Phosphate (LMP) Cathode MaterialsNANO ONE MAT CORP·Filed 2023·Application pending·0 cites
- 3657US2023246175A1One-Pot Synthesis for LiNbO3 Coated SpinelNANO ONE MAT CORP·Filed 2023·Application pending·0 cites
- 3753US2007037042A1Anode catalyst compositions for a voltage reversal tolerant fuel cellYE SIYU·Filed 2006·Application pending·0 cites
- 3852US11811056B2One-pot synthesis for LiNbO3 coated spinelNANO ONE MAT CORP·Filed 2019·Granted Nov 7, 2023·0 cites·67 claims
- 3952US2008003474A1Antifreeze cooling subsystemST-PIERRE JEAN·Filed 2007·Application pending·0 cites
- 4050US2007082808A1Non-noble metal catalysts for the oxygen reduction reactionCAMPBELL STEPHEN A·Filed 2006·Application pending·0 cites
- 4149US11897211B2Method and apparatus for automatic extrudate loading and alignmentCORNING INC·Filed 2020·Granted Feb 13, 2024·0 cites·21 claims
- 4249US7303831B2Antifreeze cooling subsystemBALLARD POWERS SYSTEMS INC·Filed 2004·Granted Dec 4, 2007·3 cites·21 claims
- 4349US2004023091A1Method and apparatus for reducing reactant crossover in a liquid feed electrochemical fuel cellFiled 2003·Application pending·0 cites
- 4448US6613464B1Method and apparatus for reducing reactant crossover in a liquid feed electrochemical fuel cellBALLARD POWER SYSTEMS·Filed 1999·Granted Sep 2, 2003·12 cites·12 claims
- 4547US8722284B2Synthesis of stable and durable catalyst composition for fuel cellCAMPBELL STEPHEN A·Filed 2010·Granted May 13, 2014·0 cites·21 claims
- 4646US2002094470A1Method of integrally sealing an electronchemical fuel cell fluid distribution layerFiled 2002·Application pending·0 cites
- 4746US2004157110A1Supported catalysts for the anode of a voltage reversal tolerant fuel cellFiled 2003·Application pending·0 cites
- 4845US2020373560A1Stabilized High Nickel NMC Cathode Materials for Improved Battery PerformanceNANO ONE MAT CORP·Filed 2020·Application pending·0 cites
- 4945US2004247990A1Platinum alloy catalysts for electrochemical fuel cellsFiled 2004·Application pending·0 cites
- 5045US2007128499A1Catalyst for fuel cellsCAMPBELL STEPHEN A·Filed 2006·Application pending·0 cites
Showing the top 50 of 57 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →