Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5104090 | Irrigation valve | Glendale Grizzle, Stephen L. Tyler, James Zimmerman | 1992-04-14 |
| 5027850 | Debris arrestor for valve bleed hole | Gerald E. Peterson, James Zimmerman | 1991-07-02 |
| 4911401 | Valve having improved bleed assembly | Stephen L. Tyler, James Zimmerman | 1990-03-27 |
| 4763838 | Sprinkler with guard | — | 1988-08-16 |