Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6367085 | Head suspension for an air supplied hood system | — | 2002-04-09 |
| 4989598 | Negative pressure full face respirator having a replaceable viewing window | Emil J. Kvaal | 1991-02-05 |
| 4280491 | Powered air respirator | Emil J. Kvall | 1981-07-28 |