Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5276678 | Distributed switching and telephone conferencing system | Herbert C. Hendrickson, Christopher John Stevens, Peter M. Onaka | 1994-01-04 | |
| 4490582 | Speakerphone control circuit | — | 1984-12-25 | |
| 4385207 | Line powered transformerless loudspeaking telephone | — | 1983-05-24 | $20,705,000 |