BALLARD POWER SYSTEMS INC.
🏢 View company profile →376Patents
42Active
376Granted
45Portfolio score
Filing activity: Nov 19, 1990 → Nov 6, 2019 · 19 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7256566B2 | Method and apparatus for determining a maximum power point of photovoltaic cells | Emerging Cross-Sectional Technologies | 328 | Expired |
| US7158395B2 | Method and apparatus for tracking maximum power point for inverters, for example, in photovoltaic applications | Emerging Cross-Sectional Technologies | 320 | Expired |
| US6603672B1 | Power converter system | Emerging Cross-Sectional Technologies | 212 | Expired |
| US6940735B2 | Power converter system | Emerging Cross-Sectional Technologies | 184 | Expired |
| US5441821A | Electrochemical fuel cell system with a regulated vacuum ejector for recirculation of the fluid fuel stream | Emerging Cross-Sectional Technologies | 172 | Expired |
| US5360679A | Hydrocarbon fueled solid polymer fuel cell electric power generation system | Emerging Cross-Sectional Technologies | 165 | Expired |
| US5366821A | Constant voltage fuel cell with improved reactant supply and control system | Emerging Cross-Sectional Technologies | 137 | Expired |
| US5200278A | Integrated fuel cell power generation system | Emerging Cross-Sectional Technologies | 137 | Expired |
| US5366818A | Solid polymer fuel cell systems incorporating water removal at the anode | Emerging Cross-Sectional Technologies | 127 | Expired |
| US5798186A | Method and apparatus for commencing operation of a fuel cell electric power generation system below the freezing temperature of water | Emerging Cross-Sectional Technologies | 126 | Expired |
| US5300370A | Laminated fluid flow field assembly for electrochemical fuel cells | Emerging Cross-Sectional Technologies | 126 | Expired |
| US5252410A | Lightweight fuel cell membrane electrode assembly with integral reactant flow passages | Emerging Cross-Sectional Technologies | 123 | Expired |
| US6106964A | Solid polymer fuel cell system and method for humidifying and adjusting the temperature of a reactant stream | Emerging Cross-Sectional Technologies | 121 | Expired |
| US6057054A | Membrane electrode assembly for an electrochemical fuel cell and a method of making an improved membrane electrode assembly | Emerging Cross-Sectional Technologies | 114 | Expired |
| US5484666A | Electrochemical fuel cell stack with compression mechanism extending through interior manifold headers | Emerging Cross-Sectional Technologies | 103 | Expired |
| US6171374A | Plate and frame fluid exchanging assembly with unitary plates and seals | Emerging Cross-Sectional Technologies | 102 | Expired |
| US6080503A | Polymer electrolyte membrane fuel cells and stacks with adhesively bonded layers | Emerging Cross-Sectional Technologies | 98 | Expired |
| US5514487A | Edge manifold assembly for an electrochemical fuel cell stack | Emerging Cross-Sectional Technologies | 89 | Expired |
| US6461751B1 | Method and apparatus for operating a fuel cell | Emerging Cross-Sectional Technologies | 89 | Expired |
| US5176966A | Fuel cell membrane electrode and seal assembly | Emerging Cross-Sectional Technologies | 87 | Expired |
| US5464700A | Gasketed membrane electrode assembly for electrochemical fuel cells | Emerging Cross-Sectional Technologies | 87 | Expired |
| US6723758B2 | Graft polymeric membranes and ion-exchange membranes formed therefrom | Emerging Cross-Sectional Technologies | 82 | Expired |
| US5470671A | Electrochemical fuel cell employing ambient air as the oxidant and coolant | Emerging Cross-Sectional Technologies | 82 | Expired |
| US6496393B1 | Integrated traction inverter module and bi-directional DC/DC converter | Electricity | 81 | Expired |
| US5928807A | Integrated seal for a PEM fuel cell | Emerging Cross-Sectional Technologies | 81 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.