Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12203841 | Portable test system for uniform chemical concentration testing of personal protection products and method of use | — | 2025-01-21 |
| 10159856 | Apparatus and method for replacing an air filter of an air filtration mask | Douglas E. Wilke | 2018-12-25 |
| 10105557 | Valve/connection system to prevent downstream contamination from an upstream source while replacing filters | Douglas E. Wilke | 2018-10-23 |