H04K 1/003
Secret communication: by varying carrier frequency at or within predetermined or random
Official title: {by varying carrier frequency at or within predetermined or random intervals (H04K1/04 takes precedence)}
H04K1/003 (Secret communication: by varying carrier frequency at or within predetermined or random) appears on 77 US grants and 56 published applications in this corpus.
Search patents in H04K- Granted patents
- 77
- Published applications
- 56
- Assignees
- 66
- Inventors
- 146
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 2 |
| 2011 | 0 | 2 |
| 2012 | 2 | 1 |
| 2013 | 1 | 3 |
| 2014 | 3 | 2 |
| 2015 | 1 | 3 |
| 2016 | 2 | 2 |
| 2017 | 3 | 5 |
| 2018 | 3 | 5 |
| 2019 | 7 | 5 |
| 2020 | 5 | 4 |
| 2021 | 5 | 6 |
| 2022 | 4 | 2 |
| 2023 | 2 | 3 |
| 2024 | 2 | 4 |
| 2025 | 4 | 3 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Flexible reference frequency allocation for smart jamming mitigation25 Aug 2026US 12,720,514 B2Nokia Technologies Oy
- Joint random subcarrier selection and channel-based artificial signal design aided pls9 Dec 2025US 12,494,862 B2
- Operating method of electronic apparatus for transmitting signal and electronic apparatus supporting the same2 Dec 2025US 12,489,543 B2Agency for Defense Development
- Systems and methods for variable-length encoding and decoding for enhancing computer systems29 Jul 2025US 12,375,477 B2Kara Partners LLC
- Signal modification for control channel physical layer security18 Mar 2025US 12,256,214 B2QUALCOMM Incorporated
- Systems and methods for variable-length encoding and decoding for enhancing computer systems30 Oct 2025US 2025/0337734 A1Kara Partners LLC
- Signal modification for control channel physical layer security19 Jun 2025US 2025/0203354 A1QUALCOMM Incorporated
- System and method for intelligent power management16 Jan 2025US 2025/0023656 A1IXI Technology Holdings, Inc.
- Frequency hopping19 Dec 2024US 2024/0421848 A1Sat-Com (Pty) Ltd
- Systems and methods for variable-length encoding and decoding for enhancing computer systems24 Oct 2024US 2024/0356913 A1Kara Partners LLC
Most cited
By later US patents
- Spread spectrum apparatus for cellular mobile communication systems304US 4,222,115 APurdue Research Foundation · 1980
- Secure open-air communication system utilizing multi-channel decoyed transmission229US 7,848,517 B2AT&T Intellectual Property II, L. P. · 2010
- Anti-jam communications system131US 4,231,113 AInternational Business Machines Corporation · 1980
- Secure communication system for multiple remote units124US 4,829,540 AFairchild Weston Systems, Inc. · 1989
- Apparatus for encoding of information107US 4,329,711 APayview Limited · 1982