Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4959853 | Frequency responsive selective ringing circuit | Philip J. Del Monte | 1990-09-25 |
| 4741024 | Selective ringing circuit for a telephone | Philip J. Del Monte | 1988-04-26 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4959853 | Frequency responsive selective ringing circuit | Philip J. Del Monte | 1990-09-25 |
| 4741024 | Selective ringing circuit for a telephone | Philip J. Del Monte | 1988-04-26 |