Issued Patents All Time
Showing 1–25 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8993187 | Method and device for limiting crossover in fuel cell systems | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2015-03-31 |
| 7282283 | Method and device for limiting crossover in fuel cell systems | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2007-10-16 |
| 7264896 | Two-stage hybrid gas pressure regulator | Steven D. Pratt, Robert W. Pennisi, Sivakumar Muthuswamy | 2007-09-04 |
| 7184756 | Wireless communication device with tamper resistant configuration settings | Steven D. Pratt, Sivakumar Muthuswamy | 2007-02-27 |
| 7132192 | Fuel cell using variable porosity gas diffusion material | Sivakumar Muthuswamy, Steven D. Pratt, Gene Kim | 2006-11-07 |
| 7108931 | Fuel cell using non-linear positive temperature coefficient material | Sivakumar Muthuswamy, Steven D. Pratt | 2006-09-19 |
| 7049015 | Method of operating a fuel cell power source | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2006-05-23 |
| 7025596 | Method and apparatus for solder-less attachment of an electronic device to a textile circuit | James A. Zollo, Bonnie Bachman, Alan Beatty, Stephen Orlando Bozzone, Nitin Desai +1 more | 2006-04-11 |
| 6986957 | Fuel cell system | Bobby Dean Landreth, Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2006-01-17 |
| 6936361 | Method for humidifying a fuel stream for a direct methanol fuel cell | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2005-08-30 |
| 6926990 | Fuel cell having porous electrodes and method for forming same | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2005-08-09 |
| 6888607 | Rewritable sign system | Bobby Dean Landreth, Steven D. Pratt, Robert W. Pennisi, Sivakumar Muthuswamy, David Fredley | 2005-05-03 |
| 6869708 | Means for measuring the liquid level in a reservoir for a fuel cell | Sivakumar Muthuswamy, Steven D. Pratt, Robert W. Pennisi | 2005-03-22 |
| 6853368 | Electronic device with improved user interface | Sivakumar Muthuswamy, Steven D. Pratt, Robert J. Mulligan, Anupama Ramamurthy | 2005-02-08 |
| 6756142 | Fuel cell using non-linear positive temperature coefficient material | Sivakumar Muthuswamy, Steven D. Pratt | 2004-06-29 |
| 6743543 | Fuel cell using variable porosity gas diffusion material | Sivakumar Muthuswamy, Steven D. Pratt | 2004-06-01 |
| 6699611 | Fuel cell having a thermo-responsive polymer incorporated therein | Gene Kim, Steven D. Pratt | 2004-03-02 |
| 6689194 | Fuel cell system having a replaceable getter element for purifying the fuel supply | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2004-02-10 |
| 6584825 | Method and apparatus for determining the amount of hydrogen in a vessel | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2003-07-01 |
| 6586124 | Method and apparatus for cold temperature operation of fuel cells utilizing hydrides having different heat capacities | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2003-07-01 |
| 6426158 | Method of diluting hydrogen gas exhausted from a fuel cell | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2002-07-30 |
| 6423434 | Method and apparatus for managing fuel cell performance | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2002-07-23 |
| 6406808 | Method and apparatus for thermal management of fuel cell systems | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2002-06-18 |
| 6322918 | Water management system for fuel cells | Steven D. Pratt, Sivakumar Muthuswamy, Robert W. Pennisi | 2001-11-27 |
| 6268077 | Portable fuel cell power supply | Steven D. Pratt, Bobby Dean Landreth, Robert W. Pennisi, Sivakumar Muthuswamy, Glenn F. Urbish | 2001-07-31 |