H04M 1/738
Interface circuits for coupling substations to external telephone lines
Official title: Interface circuits for coupling substations to external telephone lines (H04M1/78 takes precedence)
H04M1/738 (Interface circuits for coupling substations to external telephone lines) appears on 520 US grants and 276 published applications in this corpus.
Search patents in H04M- Granted patents
- 520
- Published applications
- 276
- Assignees
- 289
- Inventors
- 876
- Latest grant
- 2 Apr 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 7 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 3 | 0 |
| 1983 | 5 | 0 |
| 1984 | 6 | 0 |
| 1985 | 8 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 7 | 0 |
| 1989 | 3 | 0 |
| 1990 | 11 | 0 |
| 1991 | 7 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 14 | 0 |
| 1996 | 17 | 0 |
| 1997 | 16 | 0 |
| 1998 | 23 | 0 |
| 1999 | 27 | 0 |
| 2000 | 22 | 0 |
| 2001 | 22 | 11 |
| 2002 | 18 | 13 |
| 2003 | 20 | 32 |
| 2004 | 26 | 28 |
| 2005 | 27 | 18 |
| 2006 | 36 | 26 |
| 2007 | 23 | 31 |
| 2008 | 8 | 14 |
| 2009 | 10 | 10 |
| 2010 | 17 | 12 |
| 2011 | 9 | 7 |
| 2012 | 12 | 15 |
| 2013 | 14 | 17 |
| 2014 | 13 | 9 |
| 2015 | 14 | 1 |
| 2016 | 6 | 6 |
| 2017 | 5 | 7 |
| 2018 | 5 | 9 |
| 2019 | 7 | 3 |
| 2020 | 6 | 1 |
| 2021 | 5 | 4 |
| 2022 | 1 | 1 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- VoIP analog telephone system2 Apr 2024US 11,949,819 B2NT IP Holdings, LLC
- VoIP analog telephone system28 Feb 2023US 11,595,530 B2NetTALK.com, Inc.
- Telephony terminal14 Jun 2022US 11,363,127 B2Callahan Cellular L.L.C.
- Wireless earphone capable of voice communication17 Aug 2021US 11,095,764 B1Sangmyung University Industry-Academy Cooperation Foundation
- Telephony terminal1 Jun 2021US 11,025,763 B2Callahan Cellular L.L.C.
- VoIP Analog Telephone System6 Jul 2023US 2023/0216966 A1NetTALK.com, Inc.
- Coordination of wireless communication unit and radar unit in a wireless communication network10 Mar 2022US 2022/0075021 A1Telefonaktiebolaget LM Ericsson (publ)
- Cable Pair Stabilizer Unit and Method and System for Generating Sealing Current23 Sep 2021US 2021/0297526 A1
- Telephony terminal9 Sep 2021US 2021/0281671 A1Callahan Cellular L.L.C.
- Wireless earphone capable of voice communication19 Aug 2021US 2021/0258415 A1Sangmyung University Industry-Academy Cooperation Foundation
Most cited
By later US patents
- Portable hybrid communication system and methods458US 4,972,457 ASpectrum Information Technologies, Inc. · 1990
- Drop cable with fiber optic connector and methods for fabricating same234US 7,463,803 B2Corning Cable Systems LLC · 2008
- Universal connection for cellular telephone interface214US 5,535,274 ACellport Labs, Inc. · 1996
- Method and apparatus for providing to a customer a promotional message between ringing signals or after a call waiting tone184US 6,618,474 B12003
- Integrated telephony and data services over cable networks149US 5,999,612 AInternational Business Machines Corporation · 1999