H04L 15/00
Apparatus or local circuits for transmitting or receiving dot-and-dash codes
Official title: Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code (teaching apparatus therefor G09B; telegraph tapping keys H01H21/86)
H04L15/00 (Apparatus or local circuits for transmitting or receiving dot-and-dash codes) appears on 43 US grants and 43 published applications in this corpus.
Search patents in H04L- Granted patents
- 43
- Published applications
- 43
- Assignees
- 32
- Inventors
- 84
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 3 | 2 |
| 2015 | 1 | 1 |
| 2016 | 3 | 4 |
| 2017 | 5 | 4 |
| 2018 | 2 | 2 |
| 2019 | 3 | 1 |
| 2020 | 2 | 6 |
| 2021 | 5 | 3 |
| 2022 | 1 | 2 |
| 2023 | 2 | 4 |
| 2024 | 4 | 7 |
| 2025 | 5 | 0 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Recursive bitstring structure addressing18 Aug 2026US 12,712,810 B2Huawei Technologies Co., Ltd.
- Differentiating between human interaction and computer interaction using a natural perception of human eyes to identify human users14 Jul 2026US 12,683,965 B1Gen Digital Inc.
- External activation of quiescent device16 Jun 2026US 12,659,190 B2PassiveLogic, Inc.
- Establishing a communication session using a handshake process with light signals23 Dec 2025US 12,506,540 B2Maplebear Inc.
- Time-domain physical unclonable key (TPUK) authenticated communication11 Nov 2025US 12,470,411 B2Universiteit Twente (Ut)
- External Activation of Quiescent Device17 Sep 2026US 2026/0280936 A1PassiveLogic, Inc.
- External Activation of Quiescent Device26 Dec 2024US 2024/0430133 A1PassiveLogic, Inc.
- Method for supporting sncp over packet network28 Nov 2024US 2024/0396628 A1Orckit IP, LLC
- Method for supporting sncp over packet network28 Nov 2024US 2024/0396629 A1Orckit IP, LLC
- Establishing a communication session using a handshake process with light signals29 Aug 2024US 2024/0289856 A1Maplebear, Inc.(dba Instacart)
Most cited
By later US patents
- Managing operational throughput for shared resources43US 8,694,400 B1Amazon Technologies, Inc. · 2014
- Social authentication for account recovery32US 10,013,728 B2Microsoft Technology Licensing, LLC · 2018
- Social authentication for account recovery28US 8,856,879 B2Microsoft Corporation · 2014
- Managing operational throughput for shared resources5US 9,374,243 B1Amazon Technologies, Inc. · 2016
- Mechanism to transmit text messages using ring time3US 9,780,968 B2International Business Machines Corporation · 2017