Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5147986 | Subwoofer speaker system | Lloyd W. Cockrum | 1992-09-15 |
| 4374307 | Ringer system for a telephone | Peter H. Haagen | 1983-02-15 |
| 4222003 | Power supply with current limiting | — | 1980-09-09 |