H04J 1/00
Frequency-division multiplex systems
Official title: Frequency-division multiplex systems (H04J14/00 takes precedence)
H04J1/00 (Frequency-division multiplex systems) appears on 903 US grants and 715 published applications in this corpus.
Search patents in H04J- Granted patents
- 903
- Published applications
- 715
- Assignees
- 346
- Inventors
- 1,386
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 11 | 0 |
| 1978 | 16 | 0 |
| 1979 | 3 | 0 |
| 1980 | 16 | 0 |
| 1981 | 6 | 0 |
| 1982 | 10 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 6 | 0 |
| 1994 | 9 | 0 |
| 1995 | 8 | 0 |
| 1996 | 13 | 0 |
| 1997 | 21 | 0 |
| 1998 | 14 | 0 |
| 1999 | 16 | 0 |
| 2000 | 15 | 0 |
| 2001 | 13 | 3 |
| 2002 | 15 | 15 |
| 2003 | 8 | 10 |
| 2004 | 5 | 7 |
| 2005 | 8 | 14 |
| 2006 | 11 | 10 |
| 2007 | 4 | 12 |
| 2008 | 10 | 13 |
| 2009 | 11 | 11 |
| 2010 | 15 | 17 |
| 2011 | 9 | 19 |
| 2012 | 18 | 21 |
| 2013 | 27 | 44 |
| 2014 | 34 | 43 |
| 2015 | 44 | 52 |
| 2016 | 41 | 58 |
| 2017 | 69 | 59 |
| 2018 | 44 | 71 |
| 2019 | 63 | 56 |
| 2020 | 71 | 56 |
| 2021 | 47 | 38 |
| 2022 | 39 | 30 |
| 2023 | 33 | 18 |
| 2024 | 25 | 21 |
| 2025 | 17 | 11 |
| 2026 | 5 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Out of band demand assigned multiple access21 Apr 2026US 12,609,765 B2Hughes Network Systems, LLC
- Wireless communication system, wireless communication method, and wireless device17 Mar 2026US 12,580,670 B2NTT, Inc.
- Multiplexer and electronic device containing multiplexer10 Mar 2026US 12,574,058 B2Samsung Electronics Co., Ltd.
- Satellite system and method for geolocating a radiofrequency transmitter20 Jan 2026US 12,531,632 B2Thales
- Information receiving and sending method, device and readable storage medium20 Jan 2026US 12,532,328 B2Beijing Xiaomi Mobile Software Co., Ltd.
- Methods and apparatus for image rejection calibration1 Oct 2026US 2026/0303143 A1Silicon Laboratories Inc.
- Communication method and apparatus, storage medium, and computer program product27 Aug 2026US 2026/0254572 A1Huawei Technologies Co., Ltd.
- Control apparatus and control method13 Aug 2026US 2026/0236818 A1Fujitsu Limited
- Systems and methods for endoscopic navigation and bookmarking18 Jun 2026US 2026/0168038 A1Verily Life Sciences LLC
- Interleaved quantum computer wiring18 Jun 2026US 2026/0172130 A1International Business Machines Corporation
Most cited
By later US patents
- Simultaneous transmission of two information signals within a band-limited communications channel414US 4,425,642 AApplied Spectrum Technologies, Inc. · 1984
- High capacity reservation multiple access network with multiple shared unidirectional paths350US 5,963,557 A1999
- Frequency agile broadband communications system258US 5,594,726 AScientific-Atlanta, Inc. · 1997
- Method of and system for transmitting two different messages on a carrier wave over a single transmission channel of predetermined bandwidth246US 4,238,849 AInternational Standard Electric Corporation · 1980
- Packetized ensemble modem245US 4,438,511 ATelebit Corporation · 1984