Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4890004 | Emergency light control and battery charging system | — | 1989-12-26 |
| 4864829 | Method and apparatus for electronically pressure sealing and leak testing an idle centrifugal chiller system | Peter J. Manning, Joshua D. Costell | 1989-09-12 |
| 4802055 | Transient voltage surge suppressor | — | 1989-01-31 |