Issued Patents All Time
Showing 1–25 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8993187 | Method and device for limiting crossover in fuel cell systems | Ronald Kelley, Steven D. Pratt, Sivakumar Muthuswamy | 2015-03-31 |
| 7282283 | Method and device for limiting crossover in fuel cell systems | Ronald Kelley, Steven D. Pratt, Sivakumar Muthuswamy | 2007-10-16 |
| 7264896 | Two-stage hybrid gas pressure regulator | Ronald Kelley, Steven D. Pratt, Sivakumar Muthuswamy | 2007-09-04 |
| 7049015 | Method of operating a fuel cell power source | Steven D. Pratt, Sivakumar Muthuswamy, Ronald Kelley | 2006-05-23 |
| 6986957 | Fuel cell system | Bobby Dean Landreth, Steven D. Pratt, Sivakumar Muthuswamy, Ronald Kelley | 2006-01-17 |
| 6936361 | Method for humidifying a fuel stream for a direct methanol fuel cell | Ronald Kelley, Steven D. Pratt, Sivakumar Muthuswamy | 2005-08-30 |
| 6926990 | Fuel cell having porous electrodes and method for forming same | Ronald Kelley, Steven D. Pratt, Sivakumar Muthuswamy | 2005-08-09 |
| 6888607 | Rewritable sign system | Bobby Dean Landreth, Steven D. Pratt, Ronald Kelley, Sivakumar Muthuswamy, David Fredley | 2005-05-03 |
| 6869708 | Means for measuring the liquid level in a reservoir for a fuel cell | Ronald Kelley, Sivakumar Muthuswamy, Steven D. Pratt | 2005-03-22 |
| 6689194 | Fuel cell system having a replaceable getter element for purifying the fuel supply | Steven D. Pratt, Sivakumar Muthuswamy, Ronald Kelley | 2004-02-10 |
| 6584825 | Method and apparatus for determining the amount of hydrogen in a vessel | Steven D. Pratt, Sivakumar Muthuswamy, Ronald Kelley | 2003-07-01 |
| 6586124 | Method and apparatus for cold temperature operation of fuel cells utilizing hydrides having different heat capacities | Ronald Kelley, Steven D. Pratt, Sivakumar Muthuswamy | 2003-07-01 |
| 6426158 | Method of diluting hydrogen gas exhausted from a fuel cell | Steven D. Pratt, Sivakumar Muthuswamy, Ronald Kelley | 2002-07-30 |
| 6423434 | Method and apparatus for managing fuel cell performance | Steven D. Pratt, Ronald Kelley, Sivakumar Muthuswamy | 2002-07-23 |
| 6406808 | Method and apparatus for thermal management of fuel cell systems | Steven D. Pratt, Ronald Kelley, Sivakumar Muthuswamy | 2002-06-18 |
| 6322918 | Water management system for fuel cells | Ronald Kelley, Steven D. Pratt, Sivakumar Muthuswamy | 2001-11-27 |
| 6268077 | Portable fuel cell power supply | Ronald Kelley, Steven D. Pratt, Bobby Dean Landreth, Sivakumar Muthuswamy, Glenn F. Urbish | 2001-07-31 |
| 6214487 | Integral sensors for monitoring a fuel cell membrane and methods of monitoring | Ronald Kelley, Robert J. Mulligan, Steven D. Pratt, Sivakumar Muthuswamy, Bobby Dean Landreth | 2001-04-10 |
| 6127058 | Planar fuel cell | Steven D. Pratt, Ronald Kelley, Sivakumar Muthuswamy, Bobby Dean Landreth | 2000-10-03 |
| 6025804 | Antenna with absorptive radiation shield | James Lynn Davis, Glenn F. Urbish | 2000-02-15 |
| 5937265 | Tooling die insert and rapid method for fabricating same | Steven D. Pratt, Sivakumar Muthuswamy | 1999-08-10 |
| 5856807 | Antenna for a two-way radio | James Lynn Davis | 1999-01-05 |
| 5847787 | Low driving voltage polymer dispersed liquid crystal display device with conductive nanoparticles | David Fredley | 1998-12-08 |
| 5818005 | Electrical discharge machining electrode and rapid method for fabricating same | Steven D. Pratt, Sivakumar Muthuswamy | 1998-10-06 |
| 5814401 | Selectively filled adhesive film containing a fluxing agent | Daniel Gamota, Cynthia M. Melton | 1998-09-29 |