Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4355636 | Humdifier and heater for air to be inhaled for connection to an inhalation conduit of a respirator | Frank Benthin | 1982-10-26 |
| 4327717 | Humidity exchanger for a breathing apparatus | Frank Benthin | 1982-05-04 |
| 4318398 | Humidity exchanger for a breathing apparatus | Frank Benthin | 1982-03-09 |