Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5307796 | Methods of forming fibrous filtration face masks | Joseph P. Kronzer, Roger J. Stumo, James F. Dyrud | 1994-05-03 |
| 4807619 | Resilient shape-retaining fibrous filtration face mask | James F. Dyrud, Alice C. Murray | 1989-02-28 |
| 4536440 | Molded fibrous filtration products | — | 1985-08-20 |