H04N 21/238
Interfacing the downstream path of the transmission network
Official title: Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams {(hybrid fiber coaxial [HFC] networks for downstream channel allocation for video distribution H04L12/2801; flow control in packet networks H04L47/10; real-time communication protocols in data switching networks H04L65/00; scheduling or organising the servicing of application requests H04L67/60)}
H04N21/238 (Interfacing the downstream path of the transmission network) appears on 7,479 US grants and 8,065 published applications in this corpus.
Search patents in H04N- Granted patents
- 7,479
- Published applications
- 8,065
- Assignees
- 1,631
- Inventors
- 10,143
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 0 | 0 |
| 1989 | 4 | 0 |
| 1990 | 8 | 0 |
| 1991 | 5 | 0 |
| 1992 | 11 | 0 |
| 1993 | 17 | 0 |
| 1994 | 14 | 0 |
| 1995 | 28 | 0 |
| 1996 | 51 | 0 |
| 1997 | 46 | 0 |
| 1998 | 81 | 0 |
| 1999 | 95 | 0 |
| 2000 | 96 | 0 |
| 2001 | 116 | 67 |
| 2002 | 95 | 259 |
| 2003 | 113 | 226 |
| 2004 | 136 | 204 |
| 2005 | 77 | 212 |
| 2006 | 149 | 257 |
| 2007 | 116 | 354 |
| 2008 | 144 | 367 |
| 2009 | 170 | 485 |
| 2010 | 290 | 393 |
| 2011 | 328 | 337 |
| 2012 | 355 | 320 |
| 2013 | 363 | 317 |
| 2014 | 489 | 437 |
| 2015 | 421 | 445 |
| 2016 | 403 | 441 |
| 2017 | 434 | 443 |
| 2018 | 397 | 369 |
| 2019 | 408 | 360 |
| 2020 | 410 | 406 |
| 2021 | 411 | 353 |
| 2022 | 315 | 311 |
| 2023 | 335 | 252 |
| 2024 | 254 | 187 |
| 2025 | 196 | 168 |
| 2026 | 91 | 95 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04N 21/2383Channel coding or modulation of digital bit-stream1,798
- H04N 21/2389Multiplex stream processing1,513
- H04N 21/2387Stream processing in response to a playback request from an end-user1,449
- H04N 21/2385Channel allocation1,324
- H04N 21/2381Adapting the multiplex stream to a specific network1,206
- H04N 21/23805Controlling the feeding rate to the network549
Recent patents
- Updating media devices in a local network with a client-server architecture6 Oct 2026US 12,756,624 B2DISH Network L.L.C.
- Method and network equipment for local encoding of digital terrestrial television content into segments of adaptive content over http6 Oct 2026US 12,756,878 B2Orange
- Tune media player for broadcast and broadband services6 Oct 2026US 12,756,879 B2Sony Group Corporation
- Context-triggered proactive media playback system6 Oct 2026US 12,756,881 B1Music IP Holdings, Inc.
- Facilitating streaming in a local network with a client-server architecture29 Sep 2026US 12,750,277 B2DISH Network L.L.C.
- Video transmission system and method8 Oct 2026US 2026/0313183 A1Zixi, LLC
- Control Information for a Wirelessly-Transmitted Data Stream1 Oct 2026US 2026/0303891 A1HyperX Holdings LLC
- Use of Steganographically-Encoded Time Information as Basis to Control Implementation of Dynamic Content Modification1 Oct 2026US 2026/0303902 A1The Nielsen Company (US), LLC
- Intelligent video playback24 Sep 2026US 2026/0292272 A1Pinterest, Inc.
- Systems and methods for generalized http headers in dynamic adaptive streaming over http (dash)24 Sep 2026US 2026/0292278 A1InterDigital VC Holdings, Inc.
Most cited
By later US patents
- System and method for delivery of video data over a computer network1,423US 5,956,716 AIntervu, Inc. · 1999
- Multimedia server1,367US 6,301,604 B1Matsushita Electric Industrial Co., Ltd. · 2001
- Network controller for cable television delivery systems1,167US 5,600,364 ADiscovery Communications, Inc. · 1997
- Computer system linked by using information in data objects1,131US 6,122,403 ADigimarc Corporation · 2000
- Terminal for suggesting programs offered on a television program delivery system1,065US 5,798,785 ADiscovery Communications, Inc. · 1998