H04N 1/44
Secrecy systems
H04N1/44 (Secrecy systems) appears on 2,797 US grants and 3,422 published applications in this corpus.
Search patents in H04N- Granted patents
- 2,797
- Published applications
- 3,422
- Assignees
- 435
- Inventors
- 4,096
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 8 | 0 |
| 1992 | 10 | 0 |
| 1993 | 17 | 0 |
| 1994 | 15 | 0 |
| 1995 | 15 | 0 |
| 1996 | 18 | 0 |
| 1997 | 11 | 0 |
| 1998 | 16 | 0 |
| 1999 | 28 | 0 |
| 2000 | 25 | 0 |
| 2001 | 12 | 10 |
| 2002 | 19 | 43 |
| 2003 | 13 | 42 |
| 2004 | 12 | 43 |
| 2005 | 23 | 82 |
| 2006 | 24 | 117 |
| 2007 | 29 | 182 |
| 2008 | 31 | 164 |
| 2009 | 59 | 185 |
| 2010 | 74 | 172 |
| 2011 | 104 | 130 |
| 2012 | 175 | 113 |
| 2013 | 166 | 145 |
| 2014 | 171 | 136 |
| 2015 | 187 | 160 |
| 2016 | 129 | 213 |
| 2017 | 172 | 274 |
| 2018 | 217 | 237 |
| 2019 | 228 | 170 |
| 2020 | 184 | 171 |
| 2021 | 129 | 141 |
| 2022 | 140 | 152 |
| 2023 | 134 | 134 |
| 2024 | 98 | 78 |
| 2025 | 53 | 77 |
| 2026 | 37 | 51 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Control system, image forming apparatus, terminal apparatus, and control method6 Oct 2026US 12,756,787 B2Sharp Kabushiki Kaisha
- Information processing apparatus, image processing apparatus and control method thereof22 Sep 2026US 12,744,854 B2Canon Kabushiki Kaisha
- Imaging device with image encryption1 Sep 2026US 12,726,732 B2SK hynix Inc.
- Image forming apparatus and user registration method for allowing restriction of reuse of a login name11 Aug 2026US 12,707,015 B2Sharp Kabushiki Kaisha
- Reading apparatus11 Aug 2026US 12,707,016 B2Brother Kogyo Kabushiki Kaisha
- Methods and systems for determining the authenticity of a component8 Oct 2026US 2026/0310831 A1Lexmark International, Inc.
- Information processing apparatus, image processing apparatus, and storage medium8 Oct 2026US 2026/0313054 A1Etria Co., Ltd.
- Image forming apparatus, control method for image forming apparatus, server apparatus, control method for server apparatus, and storage medium8 Oct 2026US 2026/0313063 A1Canon Kabushiki Kaisha
- Image forming apparatus, non-transitory computer readable medium storing image forming program, and image forming system1 Oct 2026US 2026/0299482 A1FUJIFILM Business Innovation Corp.
- Information processing apparatus, service providing system, and method to modify a license based on usage1 Oct 2026US 2026/0300526 A1Ricoh Company, Ltd.
Most cited
By later US patents
- Method and apparatus for embedding authentication information within digital data738US 5,646,997 A1997
- Automatic access of electronic information through secure machine-readable codes on printed documents644US 5,933,829 ANeoMedia Technologies, Inc. · 1999
- Automatic access of electronic information through machine-readable codes on printed documents529US 6,108,656 ANeoMedia Technologies, Inc. · 2000
- Secure payment method using facsimile477US 5,590,196 ACONNOTECH Experts-conseils, inc. · 1996
- Apparatus and method for preventing disclosure through user-authentication at a printing node401US 5,633,932 AIntel Corporation · 1997