H04Q 2213/13173
Busy signals
H04Q2213/13173 (Busy signals) appears on 188 US grants and 73 published applications in this corpus.
Search patents in H04Q- Granted patents
- 188
- Published applications
- 73
- Assignees
- 68
- Inventors
- 222
- Latest grant
- 10 Jan 2017
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 7 | 0 |
| 1995 | 2 | 0 |
| 1996 | 7 | 0 |
| 1997 | 10 | 0 |
| 1998 | 26 | 0 |
| 1999 | 11 | 0 |
| 2000 | 20 | 0 |
| 2001 | 14 | 16 |
| 2002 | 16 | 14 |
| 2003 | 8 | 8 |
| 2004 | 7 | 6 |
| 2005 | 5 | 7 |
| 2006 | 7 | 10 |
| 2007 | 6 | 3 |
| 2008 | 3 | 3 |
| 2009 | 4 | 1 |
| 2010 | 4 | 2 |
| 2011 | 2 | 1 |
| 2012 | 2 | 0 |
| 2013 | 4 | 0 |
| 2014 | 2 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method, communication system and communication terminal for the transmission of data10 Jan 2017US 9,544,441 B2Unify GmbH & Co.KG
- Method, communication system and communication terminal for the transmission of data21 Jul 2015US 9,088,587 B2Unify GmbH & Co.KG
- System and process for mass telephony conference call23 Dec 2014US 8,917,633 B2Tele-Town Hall, LLC
- Method, communication system, and communication terminal for the transmission of data23 Sep 2014US 8,843,658 B2Siemens Enterprise Communications GmbH & Co.KG
- Controlling a call completion31 Dec 2013US 8,619,964 B2Telefonaktiebolaget'l M Ericsson (Publ)
- Method, Communication System and Communication Terminal for the Transmission of Data5 Nov 2015US 2015/0319311 A1Unify GmbH & Co.KG
- Method, Communication System and Communication Terminal for the Transmission of Data11 Dec 2014US 2014/0362851 A1Unify GmbH & Co.KG
- System and process for mass telephony conference call11 Aug 2011US 2011/0194465 A1Tele-Town Hall, LLC
- Controlling a Call Completion25 Nov 2010US 2010/0296644 A1Telefonaktiebolaget'l M Ericsson (Publ)
- System and process for mass telephony conference call14 Oct 2010US 2010/0260075 A1Tele-Town Hall, LLC
Most cited
By later US patents
- Telephone control system with branch routing343US 5,375,161 AAccessLine Technologies, Inc. · 1994
- Telephonic-interface statistical analysis system311US 4,845,739 AFDR Interactive Technologies · 1989
- Apparatus for interfacing analog telephones and digital data terminals to an ISDN line309US 5,305,312 AAT&T Bell Laboratories · 1994
- Automatic call back system and method of operation292US 5,155,761 AIntervoice, Inc. · 1992
- Telephonic-interface lottery system254US 5,787,156 ARonald A. Katz Technology Licensing, L.P. · 1998