H04B 13/02
Transmission systems in which the medium consists of the earth or a
Official title: Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
H04B13/02 (Transmission systems in which the medium consists of the earth or a) appears on 526 US grants and 547 published applications in this corpus.
Search patents in H04B- Granted patents
- 526
- Published applications
- 547
- Assignees
- 299
- Inventors
- 1,163
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 5 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 4 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 7 | 0 |
| 1992 | 5 | 0 |
| 1993 | 8 | 0 |
| 1994 | 3 | 0 |
| 1995 | 8 | 0 |
| 1996 | 7 | 0 |
| 1997 | 5 | 0 |
| 1998 | 7 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 4 | 1 |
| 2002 | 5 | 8 |
| 2003 | 5 | 5 |
| 2004 | 6 | 12 |
| 2005 | 10 | 5 |
| 2006 | 10 | 7 |
| 2007 | 4 | 7 |
| 2008 | 3 | 10 |
| 2009 | 7 | 10 |
| 2010 | 5 | 24 |
| 2011 | 9 | 24 |
| 2012 | 22 | 21 |
| 2013 | 27 | 23 |
| 2014 | 11 | 26 |
| 2015 | 15 | 28 |
| 2016 | 30 | 30 |
| 2017 | 26 | 32 |
| 2018 | 19 | 27 |
| 2019 | 32 | 34 |
| 2020 | 30 | 39 |
| 2021 | 34 | 32 |
| 2022 | 24 | 33 |
| 2023 | 40 | 31 |
| 2024 | 38 | 35 |
| 2025 | 18 | 24 |
| 2026 | 11 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Communication device and communication system6 Oct 2026US 12,756,483 B2Sony Group Corporation
- Device for enabling mobile communication terminal to exchange information underwater through electromagnetic waves29 Sep 2026US 12,749,805 B2Divevolk Pte. Ltd.
- Wireless communication1 Sep 2026US 12,726,279 B2Tendeka B.V.
- Techniques for adaptive video multicasts through acoustic channels in underwater environments1 Sep 2026US 12,726,280 B2Rutgers, The State University of New Jersey
- Seafloor observation network-based subsurface buoy device with real-time power supplying and high-speed data transmitting23 Jun 2026US 12,666,178 B2Institute of Acoustics, Chinese Academy of Sciences
- Downrigger Probe1 Oct 2026US 2026/0298720 A1Airmar Technology Corporation
- Subterranean communications system and method17 Sep 2026US 2026/0280726 A1CMTE Development Limited
- Systems and methods for transmitting communications and power over long distances through terrestrial sub-surfaces17 Sep 2026US 2026/0280727 A1Tennessee Technological University
- System for visual light communication and related methods27 Aug 2026US 2026/0250975 A1Elliptic Works LLC
- Communication apparatus, communication method, and program6 Aug 2026US 2026/0230192 A1NTT, Inc.
Most cited
By later US patents
- Petroleum well having downhole sensors, communication and power268US 6,679,332 B2Shell Oil Company · 2004
- Permanent downhole, wireless, two-way telemetry backbone using redundant repeaters221US 6,958,704 B2Shell Oil Company · 2005
- Controllable gas-lift well and valve202US 6,715,550 B2Shell Oil Company · 2004
- Secure two-way submarine communication system146US 5,038,406 AGTE Goverment Systems Corporation · 1991
- Mobile underwater arrays132US 5,894,450 AMassachusetts Institute of Technology · 1999