Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6927394 | Fire detector with electronic frequency analysis | David A. Castleman | 2005-08-09 |
| 6515283 | Fire detector with modulation index measurement | David A. Castleman, Theodore R. Lapp | 2003-02-04 |
| 6507023 | Fire detector with electronic frequency analysis | David A. Castleman | 2003-01-14 |