Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5679137 | Optical dirty cell sensor for an electronic air cleaner | John L. Erdman, Stephen J. Kemp, Mark R. Schoeneck | 1997-10-21 |
| 4582382 | Electrical connector for oxidized surface | Richard R. Bahn | 1986-04-15 |
| 4547950 | Method of spacing the folds of a folded filter media | — | 1985-10-22 |