Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9930881 | Corrugated fish screen with continuous flow refugia | — | 2018-04-03 |
| 7192217 | Baffle apparatus | Leslie J. Hanna | 2007-03-20 |
| 6907779 | Continuous flow measurement recorder and recording method | Blair Lewis Stringam, Kathleen H. Frizell | 2005-06-21 |
| 5544973 | Concrete step embankment protection | Kathleen H. Frizell, Tracy B. Vermeyen, Douglas I. Morris | 1996-08-13 |