H04M 1/82
Line monitoring circuits for call progress or status discrimination
Official title: Line monitoring circuits for call progress or status discrimination {(for detecting caller identity H04M1/573)}
H04M1/82 (Line monitoring circuits for call progress or status discrimination) appears on 389 US grants and 149 published applications in this corpus.
Search patents in H04M- Granted patents
- 389
- Published applications
- 149
- Assignees
- 220
- Inventors
- 668
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 15 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 12 | 0 |
| 1991 | 14 | 0 |
| 1992 | 6 | 0 |
| 1993 | 8 | 0 |
| 1994 | 20 | 0 |
| 1995 | 22 | 0 |
| 1996 | 20 | 0 |
| 1997 | 20 | 0 |
| 1998 | 19 | 0 |
| 1999 | 14 | 0 |
| 2000 | 19 | 0 |
| 2001 | 11 | 3 |
| 2002 | 11 | 13 |
| 2003 | 11 | 20 |
| 2004 | 19 | 9 |
| 2005 | 12 | 13 |
| 2006 | 13 | 9 |
| 2007 | 9 | 16 |
| 2008 | 4 | 5 |
| 2009 | 4 | 9 |
| 2010 | 4 | 8 |
| 2011 | 1 | 3 |
| 2012 | 7 | 3 |
| 2013 | 11 | 7 |
| 2014 | 4 | 3 |
| 2015 | 7 | 0 |
| 2016 | 3 | 3 |
| 2017 | 6 | 2 |
| 2018 | 3 | 3 |
| 2019 | 5 | 4 |
| 2020 | 1 | 2 |
| 2021 | 7 | 2 |
| 2022 | 2 | 3 |
| 2023 | 4 | 2 |
| 2024 | 2 | 5 |
| 2025 | 2 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Unique call progress tone invocation timer per client or access type17 Mar 2026US 12,581,012 B2T-Mobile USA, Inc.
- Systems for identifying the answering party of an automated voice call21 Oct 2025US 12,452,373 B2Capital One Services, LLC
- Methods and apparatus for bypassing holds2 Sep 2025US 12,407,776 B2Google Inc.
- System and method for notifying and documenting situations in which a smartphone is on silent mode when is not answering a phone call22 Oct 2024US 12,126,756 B1
- Methods and apparatus for bypassing holds18 Jun 2024US 12,015,736 B2Google Inc.
- Systems for identifying the answering party of an automated voice call12 Feb 2026US 2026/0046360 A1Capital One Services, LLC
- Methods and apparatus for bypassing holds18 Dec 2025US 2025/0385968 A1Google Inc.
- Methods and apparatus for bypassing holds10 Oct 2024US 2024/0340373 A1Google Inc.
- Representation of audio sources during a call26 Sep 2024US 2024/0323281 A1Nokia Technologies Oy
- Systems for identifying the answering party of an automated voice call20 Jun 2024US 2024/0205337 A1Capital One Services, LLC
Most cited
By later US patents
- Telephone status notification system237US 6,389,127 B1ICQ, Inc. · 2002
- Method and apparatus for detecting and responding to hook flash events occurring on a remote telephone188US 5,319,702 ATele-Matic Corporation · 1994
- Method and apparatus for detecting an attempted three-way conference call on a remote telephone179US 5,539,812 A1996
- Machine answer detection155US 5,371,787 ADialogic Corporation · 1994
- Method and circuitry for controlling voice mail, call logging and call blocking functions using a modem124US 5,535,265 AAST Research, Inc. · 1996