Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11707638 | Powered air breathing apparatus | Albert F. Zwolinsky, Richard D. Marshall | 2023-07-25 |
| 10695592 | Powered air breathing apparatus | Albert F. Zwolinsky, Richard D. Marshall | 2020-06-30 |
| 10668307 | Breathing apparatus | Albert F. Zwolinsky, Richard D. Marshall | 2020-06-02 |
| 9387299 | Improvements to powered air breathing apparatus | Albert F. Zwolinsky, Richard D. Marshall | 2016-07-12 |
| D687944 | Blower unit for breathing mask | Albert F. Zwolinsky, Richard D. Marshal, Sally Leyland, Robert Carr, Frank Angear | 2013-08-13 |
| D668758 | Breathing mask | Sally Leyland, Albert F. Zwolinsky, Robert Carr, Frank Angear | 2012-10-09 |
| D668327 | Breathing mask | Christopher Sumner, Sally Leyland, Robert Carr, Frank Angear, Albert F. Zwolinsky | 2012-10-02 |