Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D315583 | Inspiratory muscle exerciser or similar article | Douglas A. Larson | 1991-03-19 |
| 4854574 | Inspirator muscle trainer | Douglas A. Larson | 1989-08-08 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D315583 | Inspiratory muscle exerciser or similar article | Douglas A. Larson | 1991-03-19 |
| 4854574 | Inspirator muscle trainer | Douglas A. Larson | 1989-08-08 |