H04M 19/08
Current supply arrangements for telephone systems: with current supply sources at the
Official title: with current supply sources at the substations (generating ringing current H04M19/04)
H04M19/08 (Current supply arrangements for telephone systems: with current supply sources at the) appears on 509 US grants and 296 published applications in this corpus.
Search patents in H04M- Granted patents
- 509
- Published applications
- 296
- Assignees
- 254
- Inventors
- 885
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 10 | 0 |
| 1984 | 8 | 0 |
| 1985 | 10 | 0 |
| 1986 | 9 | 0 |
| 1987 | 9 | 0 |
| 1988 | 8 | 0 |
| 1989 | 18 | 0 |
| 1990 | 10 | 0 |
| 1991 | 9 | 0 |
| 1992 | 10 | 0 |
| 1993 | 15 | 0 |
| 1994 | 11 | 0 |
| 1995 | 12 | 0 |
| 1996 | 12 | 0 |
| 1997 | 20 | 0 |
| 1998 | 17 | 0 |
| 1999 | 17 | 0 |
| 2000 | 13 | 0 |
| 2001 | 11 | 5 |
| 2002 | 6 | 13 |
| 2003 | 16 | 12 |
| 2004 | 8 | 17 |
| 2005 | 12 | 12 |
| 2006 | 11 | 11 |
| 2007 | 8 | 18 |
| 2008 | 11 | 5 |
| 2009 | 9 | 5 |
| 2010 | 9 | 13 |
| 2011 | 4 | 4 |
| 2012 | 5 | 8 |
| 2013 | 8 | 10 |
| 2014 | 11 | 17 |
| 2015 | 11 | 24 |
| 2016 | 22 | 17 |
| 2017 | 22 | 22 |
| 2018 | 16 | 25 |
| 2019 | 25 | 18 |
| 2020 | 13 | 12 |
| 2021 | 6 | 6 |
| 2022 | 9 | 7 |
| 2023 | 7 | 3 |
| 2024 | 4 | 5 |
| 2025 | 4 | 3 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for providing voltage boosting to a time domain duplexing radio2 Jun 2026US 12,647,884 B2Outdoor Wireless Networks LLC
- System and method for a subscriber-powered network element9 Dec 2025US 12,494,852 B2
- Audio device and control method thereof7 Oct 2025US 12,438,989 B2Merry Electronics(Shenzhen) Co., Ltd.
- Power delivery through an optical system9 Sep 2025US 12,413,315 B2Cisco Technology, Inc.
- System and method for charging electronic devices in a controlled environment11 Mar 2025US 12,249,863 B2Global Tel'Link Corporation
- Systems and methods for providing voltage boosting to a time domain duplexing radio3 Sep 2026US 2026/0261967 A1Outdoor Wireless Networks LLC
- Method for playing and providing incoming call ringtone, and terminal, server and medium2 Jul 2026US 2026/0189652 A1Zte Corporation
- Wireless charging method and electronic device supporting same15 Jan 2026US 2026/0019494 A1Samsung Electronics Co., Ltd.
- Systems and methods for providing voltage boosting to a time domain duplexing radio1 Jan 2026US 2026/0006546 A1Outdoor Wireless Networks LLC
- System and method for charging electronic devices in a controlled environment6 Nov 2025US 2025/0343435 A1Global Tel'Link Corporation
Most cited
By later US patents
- Inductive coupling system for power and data transfer293US 5,455,466 ADell USA, L. P. · 1995
- Structure cabling system267US 6,473,608 B1PowerDsine, Ltd. · 2002
- Low power addressable data communication device and method261US 5,606,313 AMotorola, Inc. · 1997
- Uninterrupted power supply system250US 4,779,007 AUnison Technologies, Inc. · 1988
- Hands-free device for use with a cellular telephone in a car to permit hands-free operation of the cellular telephone250US 5,802,167 A1998