Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859328 | Twist on disposable filter | John J. Groezinger | 1989-08-22 |
| D296925 | Twist on disposable filter | John J. Groezinger | 1988-07-26 |
| 4719012 | Twist on disposable filter | John J. Groezinger | 1988-01-12 |