H04Q 1/26
For signalling trouble in unoccupied sub-exchanges
Official title: for signalling trouble in unoccupied sub-exchanges
H04Q1/26 (For signalling trouble in unoccupied sub-exchanges) appears on 11 US grants and 0 published applications in this corpus.
Search patents in H04Q- Granted patents
- 11
- Published applications
- 0
- Assignees
- 9
- Inventors
- 19
- Latest grant
- 1 Jan 2002
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Buffer for connection data1 Jan 2002US 6,335,967 B1
- Network node event notification in circuit switched environments7 Dec 1999US 5,999,592 AMitel Corporation
- Alarm notification system and method for a telephone switch22 Dec 1998US 5,852,649 ARockwell International Corporation
- Electronic exchange apparatus24 Oct 1995US 5,461,662 AKabushiki Kaisha Toshiba
- Remote maintenance method and device thereof in private branch exchange system4 Jan 1994US 5,276,727 ASamsung Electronics Co., Ltd.
No published applications in this class yet.
Most cited
By later US patents
- Remote maintenance and administration method in a switchboard system36US 5,261,061 ASamsung Electronics Co., Ltd. · 1993
- Remote maintenance method and device thereof in private branch exchange system22US 5,276,727 ASamsung Electronics Co., Ltd. · 1994
- Centralized supervisory system14US 4,575,839 AFujitsu Limited · 1986
- Remote maintenance system12US 4,989,176 AAG Communication Systems Corporation · 1991
- Electronic exchange apparatus8US 5,461,662 AKabushiki Kaisha Toshiba · 1995