H04Q 2213/26
Call-back
H04Q2213/26 (Call-back) appears on 2 US grants and 0 published applications in this corpus.
Search patents in H04Q- Granted patents
- 2
- Published applications
- 0
- Assignees
- 3
- Inventors
- 11
- Latest grant
- 20 May 1997
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Circuit arrangement for integration of EDP systems in the utilization of telephone systems20 May 1997US 5,631,953 ACSB-System Software -Entwicklung & Unternehmungsberatung GmbH
- Message signaling arrangement between a switching system and user terminals26 Apr 1988US 4,741,026 AAmerican Telephone and Telegraph Company, AT&T Bell Laboratories
No published applications in this class yet.
Most cited
By later US patents
- Circuit arrangement for integration of EDP systems in the utilization of telephone systems16US 5,631,953 ACSB-System Software -Entwicklung & Unternehmungsberatung GmbH · 1997
- Message signaling arrangement between a switching system and user terminals14US 4,741,026 AAmerican Telephone and Telegraph Company, AT&T Bell Laboratories · 1988