H04M 9/008
Multiplex systems
Official title: {Multiplex systems}
H04M9/008 (Multiplex systems) appears on 31 US grants and 1 published applications in this corpus.
Search patents in H04M- Granted patents
- 31
- Published applications
- 1
- Assignees
- 12
- Inventors
- 77
- Latest grant
- 2 Jun 1998
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Digital key telephone connecting apparatus and method in a digital key telephone system2 Jun 1998US 5,761,287 ASamsung Electronics Co., Ltd.
- Digital exchange system with function of displaying operation state of system7 Apr 1998US 5,737,390 AKabushiki Kaisha Toshiba
- PC with telephony exchange function15 Jul 1997US 5,649,005 ANorthern Telecom Limited
- Digital sound level control apparatus27 Feb 1996US 5,495,529 ANEC Corporation
- Conferencing system for distributed switching network3 Jan 1995US 5,379,280 AIPC Information Systems, Inc.
Most cited
By later US patents
- Signal multiplexing circuit106US 4,171,467 ABell Telephone Laboratories, Incorporated · 1979
- Signal multiplexing circuit89US 4,646,289 ANorthern Telecom Limited · 1987
- Time division multiplex data transmission method and apparatus35US 4,805,165 AIwatsu Electric Co., Ltd. · 1989
- Digital key telephone system35US 5,136,585 ANorthern Telecom Limited · 1992
- Key telephone system with enhanced connectivity29US 5,204,861 ANorthern Telecom Limited · 1993