Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4780921 | Cover for therapeutic support cushion | Karen R. Lahn | 1988-11-01 |
| 4631399 | Multiposition rotary switch with phototransistors | — | 1986-12-23 |
| 4628927 | Reversible face mask with replaceable air filter insert | — | 1986-12-16 |
| 4520509 | Mask with removable countercurrent exchange module | — | 1985-06-04 |
| 4503724 | Power transmission unit with oscillating drive and driven members | — | 1985-03-12 |
| 4458679 | Cold weather respiratory mask | — | 1984-07-10 |
| 4438876 | Combination back pack and tent frame | — | 1984-03-27 |
| 4331272 | Frameless back pack with tent | — | 1982-05-25 |