Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5107128 | Method and apparatus for detecting flame with adjustable optical coupling | John D. Spencer | 1992-04-21 |
| 4983853 | Method and apparatus for detecting flame | John D. Spencer | 1991-01-08 |