Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D320985 | Integrated answering machine | David C. Danielson, Daniel Harden, Raymond Motluck, Michael P. Zambelli | 1991-10-22 |
| D319439 | Adjunct answering machine | David C. Danielson, Daniel Harden, Raymond Motluck, Michael P. Zambelli | 1991-08-27 |