H04Q 2213/334
Key telephone system
H04Q2213/334 (Key telephone system) appears on 2 US grants and 0 published applications in this corpus.
Search patents in H04Q- Granted patents
- 2
- Published applications
- 0
- Assignees
- 2
- Inventors
- 7
- Latest grant
- 28 Mar 1995
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
No published applications in this class yet.
Most cited
By later US patents