Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4488272 | Musical door chime preferably also combined with a clock for annunciating the time | — | 1984-12-11 |
| 4414877 | Musical door chime preferably also combined with a clock for annunciating the time | — | 1983-11-15 |
| 4338553 | Control system for a motor actuated door operating mechanism | — | 1982-07-06 |
| 4326276 | Musical door chime preferably also combined with a clock for annunciating the time | — | 1982-04-20 |