Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856555 | Check valve | Gary W. Scheffel | 1989-08-15 |
| 4840191 | Inflatable valve | Gary W. Scheffel | 1989-06-20 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856555 | Check valve | Gary W. Scheffel | 1989-08-15 |
| 4840191 | Inflatable valve | Gary W. Scheffel | 1989-06-20 |