Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5964218 | Face mask with back-up smoke inhalation protection and method of operation | Dennis Smith, Karen Joy Hammon Nelson | 1999-10-12 |
| 5524616 | Method of air filtration for fire fighter emergency smoke inhalation protection | Dennis Smith, Karen Joy Hammon Nelson | 1996-06-11 |