Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5782305 | Method and apparatus for removing fluid from production tubing into the well | — | 1998-07-21 |
| 4525650 | Starting and operating method and apparatus for discharge lamps | Joseph C. Engel, Robert J. Spreadbury, Robert T. Elms, Gary F. Saletta | 1985-06-25 |
| 4438369 | Unitary light source comprising compact HID lamp and incandescent ballast filament | Joseph C. Engel | 1984-03-20 |