Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6156089 | Two-stage air filter with multiple-layer stage and post-filter stage | Michael J. Stemmer | 2000-12-05 |
| 5858045 | Multiple layer air filter media | Michael J. Stemmer | 1999-01-12 |