H04J 4/00
Combined time-division and frequency-division multiplex systems
Official title: Combined time-division and frequency-division multiplex systems (H04J13/00 takes precedence {; data transmission H04L5/26; telemetry G08C15/00})
H04J4/00 (Combined time-division and frequency-division multiplex systems) appears on 289 US grants and 189 published applications in this corpus.
Search patents in H04J- Granted patents
- 289
- Published applications
- 189
- Assignees
- 149
- Inventors
- 528
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 10 | 0 |
| 1996 | 5 | 0 |
| 1997 | 6 | 0 |
| 1998 | 11 | 0 |
| 1999 | 5 | 0 |
| 2000 | 8 | 0 |
| 2001 | 9 | 1 |
| 2002 | 6 | 4 |
| 2003 | 5 | 5 |
| 2004 | 8 | 2 |
| 2005 | 3 | 4 |
| 2006 | 4 | 4 |
| 2007 | 0 | 1 |
| 2008 | 4 | 7 |
| 2009 | 3 | 11 |
| 2010 | 3 | 3 |
| 2011 | 9 | 10 |
| 2012 | 6 | 5 |
| 2013 | 14 | 17 |
| 2014 | 8 | 13 |
| 2015 | 13 | 24 |
| 2016 | 22 | 16 |
| 2017 | 22 | 12 |
| 2018 | 10 | 12 |
| 2019 | 9 | 14 |
| 2020 | 10 | 6 |
| 2021 | 12 | 5 |
| 2022 | 4 | 3 |
| 2023 | 6 | 4 |
| 2024 | 5 | 4 |
| 2025 | 1 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Antenna switch for time division duplexing and frequency division duplexing14 Jul 2026US 12,683,639 B2Skyworks Solutions, Inc.
- Systems and methods for controlling electrical power outlets in a vehicle27 May 2025US 12,311,911 B2Ford Global Technologies, LLC
- Synchronous dual band signal acquisition and source location system3 Dec 2024US 12,160,052 B2RF Controls, LLC
- Method and system of a time-frequency division multiplexed signal receiver13 Aug 2024US 12,063,107 B1Cable Television Laboratories, Inc.
- Multi-channel time-division multiplexing access methods and systems11 Jun 2024US 12,010,666 B2TrellisWare Technologies, Inc.
- Method for near 100% duty-cycle retrodirective beamforming28 May 2026US 2026/0149523 A1Rockwell Collins, Inc.
- Synchronous dual band signal acquisition and source location system20 Feb 2025US 2025/0062530 A1RF Controls, LLC
- Method and system of a time-frequency division multiplexed receiver5 Dec 2024US 2024/0405907 A1Cable Television Laboratories, Inc.
- Integrated circuit for discrete fourier transforming a time signal to a frequency signal30 May 2024US 2024/0179037 A1Sun Patent Trust
- Systems and methods for controlling electrical power outlets in a vehicle28 Mar 2024US 2024/0101098 A1Ford Global Technologies, LLC
Most cited
By later US patents
- High capacity reservation multiple access network with multiple shared unidirectional paths350US 5,963,557 A1999
- Periodic wireless data broadcast193US 5,842,010 ABell Communications Research, Inc. · 1998
- System and method for optimizing spectral efficiency using time-frequency-code slicing181US 6,018,528 AAT&T Corp. · 2000
- Method and apparatus for reserving resources of one or more multiple access communication channels179US 6,370,153 B12002
- Adaptive distribution system for transmitting wideband video data over narrowband multichannel wireless communication system172US 5,585,850 A1996