Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6466737 | Portable electric space heater | Walter Birdsell | 2002-10-15 |
| D446291 | Portable electric heater | Walter Birdsell, Marc Drucker, Steffen Koury | 2001-08-07 |
| D445173 | Heater | Walter Birdsell, Marc Drucker, Steffen Koury | 2001-07-17 |
| 6167193 | Portable electric heater with digital display | Walter Birdsell | 2000-12-26 |