Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10953181 | Respiratory mask | Michael David Hallett, Roger Foote, Michael Gunaratnam | 2021-03-23 |
| 10272223 | Respiratory valve apparatus | Michael David Hallett, Michael Kassipillai Gunaratnam | 2019-04-30 |
| 9308344 | Respiratory valve apparatus | Michael David Hallett, Michael Kassipillai Gunaratnam | 2016-04-12 |