H04M 1/00
Substation equipment
Official title: Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08)
H04M1/00 (Substation equipment) appears on 62,573 US grants and 72,792 published applications in this corpus.
Search patents in H04M- Granted patents
- 62,573
- Published applications
- 72,792
- Assignees
- 10,336
- Inventors
- 94,355
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 105 | 0 |
| 1977 | 110 | 0 |
| 1978 | 100 | 0 |
| 1979 | 74 | 0 |
| 1980 | 81 | 0 |
| 1981 | 85 | 0 |
| 1982 | 91 | 0 |
| 1983 | 86 | 0 |
| 1984 | 123 | 0 |
| 1985 | 134 | 0 |
| 1986 | 122 | 0 |
| 1987 | 157 | 0 |
| 1988 | 193 | 0 |
| 1989 | 264 | 0 |
| 1990 | 227 | 0 |
| 1991 | 225 | 0 |
| 1992 | 231 | 0 |
| 1993 | 250 | 0 |
| 1994 | 303 | 0 |
| 1995 | 339 | 0 |
| 1996 | 436 | 0 |
| 1997 | 436 | 0 |
| 1998 | 648 | 0 |
| 1999 | 753 | 0 |
| 2000 | 740 | 0 |
| 2001 | 843 | 527 |
| 2002 | 832 | 1516 |
| 2003 | 800 | 1614 |
| 2004 | 924 | 2191 |
| 2005 | 879 | 2565 |
| 2006 | 1493 | 2880 |
| 2007 | 1272 | 3179 |
| 2008 | 1238 | 3062 |
| 2009 | 1375 | 3145 |
| 2010 | 1734 | 3274 |
| 2011 | 2165 | 2903 |
| 2012 | 2910 | 3019 |
| 2013 | 3049 | 3548 |
| 2014 | 3198 | 3764 |
| 2015 | 3220 | 3943 |
| 2016 | 3433 | 3995 |
| 2017 | 3706 | 3797 |
| 2018 | 3286 | 3307 |
| 2019 | 3554 | 3230 |
| 2020 | 3305 | 3329 |
| 2021 | 2716 | 3039 |
| 2022 | 2515 | 2840 |
| 2023 | 2211 | 2704 |
| 2024 | 2309 | 2302 |
| 2025 | 2133 | 1880 |
| 2026 | 1160 | 1239 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04M 1/72Mobile telephones32,025
- H04M 1/02Constructional features of telephone sets24,507
- H04M 1/60Including speech amplifiers5,713
- H04M 1/26Devices for calling a subscriber5,227
- H04M 1/66Substation equipment: with means for preventing unauthorised or fraudulent calling3,499
- H04M 1/57Arrangements for indicating or recording the number of the calling subscriber at3,091
- H04M 1/64Automatic arrangements for answering calls2,211
- H04M 1/253Telephone sets using digital voice transmission1,725
All 20 subgroupsShow fewer
- H04M 1/247Telephone sets including user guidance or feature selection means facilitating their use1,264
- H04M 1/24Arrangements for testing877
- H04M 1/56Arrangements for indicating or recording the called number at the calling subscriber's523
- H04M 1/738Interface circuits for coupling substations to external telephone lines520
- H04M 1/82Line monitoring circuits for call progress or status discrimination389
- H04M 1/71Substation extension arrangements351
- H04M 1/006Call diverting means274
- H04M 1/68Circuit arrangements for preventing eavesdropping149
- H04M 1/58Anti-side-tone circuits125
- H04M 1/78Circuit arrangements in which low-frequency speech signals proceed in one direction on60
- H04M 1/80Telephone line holding circuits59
- H04M 1/003Telephone sets using electrooptical means in the transmission path30
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Most cited
By later US patents
- Intelligent touch display1,903US 6,310,610 B1Nortel Networks Limited · 2001
- Touch screen device, method, and graphical user interface for determining commands by applying heuristics1,894US 7,479,949 B2Apple Inc. · 2009
- Method of using a communications device together with another communications device, a communications system, a communications device and an accessory device for use in connection with a communications device1,777US 7,130,608 B2Telefonaktiegolaget LM Ericsson (publ) · 2006
- Audio distribution system having programmable zoning features1,660US 5,761,320 AElan Home Systems, L.L.C. · 1998
- Audio distribution system having programmable zoning features1,643US 5,440,644 ASquare D Company · 1995