H04M 1/80
Telephone line holding circuits
H04M1/80 (Telephone line holding circuits) appears on 59 US grants and 19 published applications in this corpus.
Search patents in H04M- Granted patents
- 59
- Published applications
- 19
- Assignees
- 40
- Inventors
- 94
- Latest grant
- 31 May 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 6 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 1 |
| 2002 | 2 | 2 |
| 2003 | 0 | 1 |
| 2004 | 2 | 1 |
| 2005 | 3 | 1 |
| 2006 | 1 | 2 |
| 2007 | 0 | 4 |
| 2008 | 2 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Protecting user data during audio interactions31 May 2022US 11,349,983 B2AT&T Intellectual Property I, L. P.
- Systems and methods for enabling a universal back-cover wireless charging solution13 Nov 2018US 10,128,689 B2
- Systems and methods for enabling a universal back-cover wireless charging solution8 Nov 2016US 9,490,653 B2QUALCOMM Incorporated
- Remotely activated on-hold circuit15 Sep 2015US 9,137,356 B1
- Method for playing a personalized clip18 Jun 2013US 8,467,501 B2Alcatel Lucent
- Protecting user data during audio interactions15 Sep 2022US 2022/0294899 A1AT&T Intellectual Property I, L. P.
- Protecting user data during audio interactions6 Jan 2022US 2022/0006898 A1AT&T Intellectual Property I, L. P.
- Telephone system, telephone set, and telephone transfer method16 Jul 2020US 2020/0228662 A1NEC Platforms, Ltd.
- Systems and methods for enabling a universal back-cover wireless charging solution30 Mar 2017US 2017/0093201 A1QUALCOMM Incorporated
- Systems and methods for enabling a universal back-cover wireless charging solution29 Jan 2015US 2015/0028803 A1QUALCOMM Incorporated
Most cited
By later US patents
- Call waiting-caller identification notification device106US 6,317,488 B1Notify Corporation · 2001
- Telephone system with monitor on hold feature75US 5,195,087 AAT&T Bell Laboratories · 1993
- System and method to provide control of music on hold to the hold party64US 6,694,012 B1Lucent Technologies Inc. · 2004
- Subscriber equipment muting method and apparatus45US 5,805,687 ANorthern Telecom Limited · 1998
- Call holding alert system31US 4,834,551 A1989