H04Q 2213/22
Pbx
H04Q2213/22 (Pbx) appears on 16 US grants and 1 published applications in this corpus.
Search patents in H04Q- Granted patents
- 16
- Published applications
- 1
- Assignees
- 14
- Inventors
- 38
- Latest grant
- 20 May 2014
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 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 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Telephone exchange system, dial-in incoming call method thereof, and dial-in incoming call program thereof20 May 2014US 8,731,173 B2NEC Infrontia Corporation
- Digital telephone switching system having plural terminal devices directly connected to a common digital line17 Feb 1998US 5,719,855 AHitachi Telecom Technologies, Ltd.
- Data terminal control unit including table for efficiently making connections between data terminal equipments and between data terminal equipment and outside lines10 Oct 1995US 5,457,693 ASharp Kabushiki Kaisha
- Communication system and a private branch exchange to be used in such a communication system12 Sep 1995US 5,450,396 AU. S. Philips Corporation
- ISDN-to-ISDN communication via satellite microwave radio frequency communications link2 May 1995US 5,412,660 ATrimble Navigation Limited
Most cited
By later US patents
- ISDN-to-ISDN communication via satellite microwave radio frequency communications link164US 5,412,660 ATrimble Navigation Limited · 1995
- Communication system for converting ISDN signaling protocol between local and public network having first group of mandatory elements and second group of non-mandatory elements44US 5,278,972 AAT&T Bell Laboratories · 1994
- Homebus system for permitting homebus equipment and ISDN basic interface equipment to use same twisted pair line homebus36US 5,379,441 AMatsushita Electric Industrial Co., Ltd. · 1995
- ISDN subscriber terminal control system29US 4,722,082 AKokusai Denshin Denwa Kabushiki Kaisha · 1988
- ISDN network termination unit enabling to establish data link between one terminal equipment and other terminal equipments connected to the unit without use of subscriber line24US 4,999,836 ANEC Corporation · 1991