Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7401512 | Solid state illuminator for bi-color ported water level gauges | John D. Spencer | 2008-07-22 |
| 7213457 | Solid state illuminator for bi-color ported water level gauges | John D. Spencer | 2007-05-08 |
| 7197926 | Solid state illuminator for bi-color ported water level gauges | John D. Spencer | 2007-04-03 |
| 6938477 | Solid state illuminator for bi-colored ported water level gauges | John D. Spencer | 2005-09-06 |
| 5261437 | Method and apparatus for monitoring and analyzing recirculation control system performance | — | 1993-11-16 |