Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870991 | Lawn sprinkler fertilizer device | Henry W. Mitchell | 1989-10-03 |
| 4858099 | Resonant inverter | Carl A. Brooks, Alan M. Smith | 1989-08-15 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870991 | Lawn sprinkler fertilizer device | Henry W. Mitchell | 1989-10-03 |
| 4858099 | Resonant inverter | Carl A. Brooks, Alan M. Smith | 1989-08-15 |