Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4225856 | Circuit means for providing multiple audible signals from an audible tone generator means | — | 1980-09-30 |
| 4213121 | Chime tone audio system utilizing a piezoelectric transducer | Louis P. Sweany | 1980-07-15 |