H04Q 2213/18
Ringing
H04Q2213/18 (Ringing) appears on 19 US grants and 1 published applications in this corpus.
Search patents in H04Q- Granted patents
- 19
- Published applications
- 1
- Assignees
- 11
- Inventors
- 32
- Latest grant
- 20 May 2014
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 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
- Call waiting response status10 Jun 2003US 6,577,722 B1Agere Systems Inc.
- Distinctive ringing and distinctive call-waiting tones in an ISDN14 Sep 1999US 5,953,407 ANortel Networks Limited
- ISDN-based high speed communication system3 Nov 1998US 5,832,240 A
- Communication apparatus providing improved information on the states of data channels15 Jul 1997US 5,648,971 ACanon Kabushiki Kaisha
Most cited
By later US patents
- Interface for a data telephone and data terminal in a digital telephone system58US 5,317,630 AAT&T Bell Laboratories · 1994
- Voice and video communication apparatus42US 5,510,829 ACanon Kabushiki Kaisha · 1996
- ISDN-based high speed communication system39US 5,832,240 A1998
- Interface for ISDN channels31US 5,113,396 ACanon Kabushiki Kaisha · 1992
- Digital added main line system30US 5,473,613 ARaychem Corporation · 1995