Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5336968 | DC operated sodium vapor lamp | Jack M. Strok, Rolf S. Bergman | 1994-08-09 |
| 4517491 | Incandescent lamp source utilizing an integral cylindrical transparent heat mirror | Lee W. Otto, Rolf S. Bergman | 1985-05-14 |