PLUG POWER INC.
🏢 View company profile →163Patents
33Active
163Granted
51Portfolio score
Filing activity: Aug 7, 1997 → Mar 8, 2024 · 10 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6219623A | Anti-islanding method and apparatus for distributed power generation | Emerging Cross-Sectional Technologies | 421 | Expired |
| US6810339B2 | Anti-islanding method and apparatus for distributed power generation | Emerging Cross-Sectional Technologies | 235 | Expired |
| US6280865A | Fuel cell system with hydrogen purification subsystem | Emerging Cross-Sectional Technologies | 159 | Expired |
| US6329090A | Enthalpy recovery fuel cell system | Emerging Cross-Sectional Technologies | 117 | Expired |
| US6284399A | Fuel cell system having humidification membranes | Emerging Cross-Sectional Technologies | 69 | Expired |
| US6261711A | Sealing system for fuel cells | Emerging Cross-Sectional Technologies | 50 | Expired |
| US6110612A | Structure for common access and support of fuel cell stacks | Emerging Cross-Sectional Technologies | 49 | Expired |
| US6510369B1 | Residential load shedding | Emerging Cross-Sectional Technologies | 47 | Expired |
| US6498462B2 | Generator control system to accommodate a decrease in a power grid voltage | Electricity | 42 | Expired |
| US6682844B2 | Release valve and method for venting a system | Emerging Cross-Sectional Technologies | 39 | Expired |
| US6218039A | Clamping apparatus and method for a fuel cell | Emerging Cross-Sectional Technologies | 37 | Expired |
| US6066408A | Fuel cell cooler-humidifier plate | Emerging Cross-Sectional Technologies | 35 | Expired |
| US6096450A | Fuel cell assembly fluid flow plate having conductive fibers and rigidizing material therein | Emerging Cross-Sectional Technologies | 35 | Expired |
| US6251534A | Fuel cell cascade flow system | Emerging Cross-Sectional Technologies | 33 | Expired |
| US6174616A | Fuel cell assembly unit for promoting fluid service and design flexibility | Emerging Cross-Sectional Technologies | 31 | Expired |
| US6093502A | Fuel cell with selective pressure variation and dynamic inflection | Emerging Cross-Sectional Technologies | 31 | Expired |
| US6489052B1 | Fuel cell air purification subsystem | Emerging Cross-Sectional Technologies | 31 | Expired |
| US6140820A | Measuring cell voltages of a fuel cell stack | Physics | 31 | Expired |
| US6280870A | Combined fuel cell flow plate and gas diffusion layer | Emerging Cross-Sectional Technologies | 30 | Expired |
| US6200698A | End plate assembly having a two-phase fluid-filled bladder and method for compressing a fuel cell stack | Emerging Cross-Sectional Technologies | 29 | Expired |
| US6309769A | Carbon monoxide filter layer | Emerging Cross-Sectional Technologies | 29 | Expired |
| US6881508B2 | Apparatus and method for controlling a fuel cell system | Emerging Cross-Sectional Technologies | 27 | Expired |
| US6410179B1 | Fluid flow plate having a bridge piece | Emerging Cross-Sectional Technologies | 26 | Expired |
| US6303245A | Fuel cell channeled distribution of hydration water | Emerging Cross-Sectional Technologies | 26 | Expired |
| US6500580B1 | Fuel cell fluid flow plate for promoting fluid service | Emerging Cross-Sectional Technologies | 25 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.