H04N 21/4181
For conditional access
Official title: {for conditional access}
H04N21/4181 (For conditional access) appears on 823 US grants and 973 published applications in this corpus.
Search patents in H04N- Granted patents
- 823
- Published applications
- 973
- Assignees
- 301
- Inventors
- 1,377
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 8 | 0 |
| 1998 | 15 | 0 |
| 1999 | 8 | 0 |
| 2000 | 14 | 0 |
| 2001 | 13 | 12 |
| 2002 | 11 | 40 |
| 2003 | 16 | 44 |
| 2004 | 14 | 68 |
| 2005 | 15 | 85 |
| 2006 | 37 | 80 |
| 2007 | 32 | 94 |
| 2008 | 28 | 63 |
| 2009 | 48 | 66 |
| 2010 | 79 | 67 |
| 2011 | 53 | 60 |
| 2012 | 53 | 42 |
| 2013 | 58 | 39 |
| 2014 | 63 | 51 |
| 2015 | 68 | 48 |
| 2016 | 46 | 30 |
| 2017 | 35 | 20 |
| 2018 | 26 | 17 |
| 2019 | 22 | 11 |
| 2020 | 9 | 10 |
| 2021 | 9 | 6 |
| 2022 | 8 | 7 |
| 2023 | 6 | 5 |
| 2024 | 5 | 3 |
| 2025 | 4 | 4 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Secure management of accounts on display devices using a contactless card5 May 2026US 12,621,155 B2Capital One Services, LLC
- Smart card interface, data transmission method and television chip21 Apr 2026US 12,610,102 B2Beijing ESWIN Computing Technology Co., Ltd.
- Content protection10 Feb 2026US 12,549,786 B2Nagravision Sarl
- Smartphone-based conditional access system29 Jul 2025US 12,375,758 B2Synamedia Limited
- Control integrated circuit for maintaining video output to conditional access module with aid of reference clock regeneration, associated television receiver and associated method24 Jun 2025US 12,342,032 B2Realtek Semiconductor Corp.
- Content protection4 Jun 2026US 2026/0156307 A1Nagravision Sarl
- Virtual set-top box17 Jul 2025US 2025/0234068 A1DISH Technologies L. L. C.
- Iptv follow me content system and method15 May 2025US 2025/0159293 A1Adeia Media Holdings LLC
- Content protection10 Apr 2025US 2025/0119601 A1Nagravision Sarl
- Smart card interface, data transmission method and television chip10 Apr 2025US 2025/0119623 A1Beijing ESWIN Computing Technology Co., Ltd.
Most cited
By later US patents
- Television program delivery system971US 5,559,549 ADiscovery Communications, Inc. · 1996
- Advanced set top terminal for cable television delivery systems699US 5,990,927 ADiscovery Communications, Inc. · 1999
- Set top terminal for cable television delivery systems688US 5,734,853 ADiscovery Communications, Inc. · 1998
- System and method for using television schedule information551US 6,323,911 B1Starsight Telecast, Inc. · 2001
- Digital cable headend for cable television delivery system450US 5,682,195 ADiscovery Communications, Inc. · 1997