Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5679137 | Optical dirty cell sensor for an electronic air cleaner | John L. Erdman, Stephen J. Kemp, Maynard L. Thompson | 1997-10-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5679137 | Optical dirty cell sensor for an electronic air cleaner | John L. Erdman, Stephen J. Kemp, Maynard L. Thompson | 1997-10-21 |