Issued Patents 1997
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5669797 | Polyurethane pad covering | Robert Wolf, Scott M. Purrington, John M. Brandner, John F. Reed | 1997-09-23 |
| 5658640 | Electret filter media having an undulated surface | Michael R. Berrigan | 1997-08-19 |
| 5658641 | Filter media haing an undulated surface | Michael R. Berrigan | 1997-08-19 |
| 5643507 | Filter media having an undulated surface | Michael R. Berrigan | 1997-07-01 |
| 5641555 | Cup-shaped filtration mask having an undulated surface | Michael R. Berrigan | 1997-06-24 |
| 5593769 | Polyurethane pad covering for gel filled articles | Robert Wolf, Scott M. Purrington, John M. Brandner, John F. Reed | 1997-01-14 |