Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5888381 | Water filter with pressure actuated flow monitor | Richard D. Primdahl, Dale A. Squier | 1999-03-30 |
| 5751598 | Water softening apparatus with microprocessor control | Roger Rehfeldt | 1998-05-12 |
| 5699272 | Water softening system with self adjusting rinse cycle | — | 1997-12-16 |
| 4933535 | Piecewise linear temperature controller utilizing pulse width modulation | — | 1990-06-12 |