H04M 3/00
Automatic or semi-automatic exchanges
H04M3/00 (Automatic or semi-automatic exchanges) appears on 40,592 US grants and 36,245 published applications in this corpus.
Search patents in H04M- Granted patents
- 40,592
- Published applications
- 36,245
- Assignees
- 6,555
- Inventors
- 53,141
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 54 | 0 |
| 1977 | 66 | 0 |
| 1978 | 55 | 0 |
| 1979 | 59 | 0 |
| 1980 | 51 | 0 |
| 1981 | 67 | 0 |
| 1982 | 69 | 0 |
| 1983 | 52 | 0 |
| 1984 | 105 | 0 |
| 1985 | 96 | 0 |
| 1986 | 127 | 0 |
| 1987 | 130 | 0 |
| 1988 | 145 | 0 |
| 1989 | 157 | 0 |
| 1990 | 165 | 0 |
| 1991 | 160 | 0 |
| 1992 | 148 | 0 |
| 1993 | 188 | 0 |
| 1994 | 252 | 0 |
| 1995 | 381 | 0 |
| 1996 | 461 | 0 |
| 1997 | 420 | 0 |
| 1998 | 703 | 0 |
| 1999 | 873 | 0 |
| 2000 | 736 | 0 |
| 2001 | 853 | 368 |
| 2002 | 895 | 1404 |
| 2003 | 902 | 1490 |
| 2004 | 1133 | 1613 |
| 2005 | 884 | 1740 |
| 2006 | 1311 | 1719 |
| 2007 | 1088 | 1880 |
| 2008 | 927 | 1956 |
| 2009 | 1002 | 1746 |
| 2010 | 1194 | 1656 |
| 2011 | 1468 | 1406 |
| 2012 | 1962 | 1474 |
| 2013 | 2272 | 1740 |
| 2014 | 2441 | 1842 |
| 2015 | 2081 | 1921 |
| 2016 | 1987 | 1749 |
| 2017 | 1926 | 1421 |
| 2018 | 1665 | 1265 |
| 2019 | 1647 | 1144 |
| 2020 | 1531 | 1200 |
| 2021 | 1221 | 1236 |
| 2022 | 1112 | 1032 |
| 2023 | 1137 | 1057 |
| 2024 | 939 | 884 |
| 2025 | 831 | 761 |
| 2026 | 463 | 541 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04M 3/42Systems providing special services or facilities to subscribers34,726
- H04M 3/22Arrangements for supervision, monitoring or testing7,041
- H04M 3/38Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections2,076
- H04M 3/08Indicating faults in circuits or apparatus747
- H04M 3/02Calling substations705
- H04M 3/005Interface circuits for subscriber lines564
- H04M 3/18Automatic or semi-automatic exchanges: with means for reducing interference or noise442
- H04M 3/002Applications of echo suppressors or cancellers in telephonic connections391
All 12 subgroupsShow fewer
- H04M 3/20Automatic or semi-automatic exchanges: with means for interrupting existing connections265
- H04M 3/60Semi-automatic systems, i.e. in which the numerical selection of the outgoing line165
- H04M 3/40Applications of speech amplifiers128
- H04M 3/16Automatic or semi-automatic exchanges: with lock-out or secrecy provision in party-line systems118
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