Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5847550 | Exit sign having a pulse switching tandem flyback voltage converter and a backup battery | David Schie | 1998-12-08 | $4,248,000 |
| 5656925 | Pulse switching tandem flyback voltage converter | David Schie | 1997-08-12 | $2,271,000 |