G01S 13/74
Systems using reradiation of radio waves
Official title: Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
G01S13/74 (Systems using reradiation of radio waves) appears on 4,375 US grants and 4,513 published applications in this corpus.
Search patents in G01S- Granted patents
- 4,375
- Published applications
- 4,513
- Assignees
- 1,635
- Inventors
- 8,079
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 37 | 0 |
| 1977 | 44 | 0 |
| 1978 | 44 | 0 |
| 1979 | 26 | 0 |
| 1980 | 26 | 0 |
| 1981 | 18 | 0 |
| 1982 | 20 | 0 |
| 1983 | 13 | 0 |
| 1984 | 10 | 0 |
| 1985 | 18 | 0 |
| 1986 | 22 | 0 |
| 1987 | 41 | 0 |
| 1988 | 22 | 0 |
| 1989 | 26 | 0 |
| 1990 | 29 | 0 |
| 1991 | 33 | 0 |
| 1992 | 32 | 0 |
| 1993 | 48 | 0 |
| 1994 | 61 | 0 |
| 1995 | 64 | 0 |
| 1996 | 73 | 0 |
| 1997 | 64 | 0 |
| 1998 | 68 | 0 |
| 1999 | 55 | 0 |
| 2000 | 59 | 0 |
| 2001 | 44 | 12 |
| 2002 | 73 | 64 |
| 2003 | 72 | 55 |
| 2004 | 58 | 59 |
| 2005 | 53 | 89 |
| 2006 | 67 | 119 |
| 2007 | 54 | 102 |
| 2008 | 56 | 121 |
| 2009 | 85 | 107 |
| 2010 | 90 | 118 |
| 2011 | 76 | 114 |
| 2012 | 93 | 95 |
| 2013 | 79 | 102 |
| 2014 | 106 | 122 |
| 2015 | 101 | 120 |
| 2016 | 108 | 128 |
| 2017 | 130 | 148 |
| 2018 | 136 | 198 |
| 2019 | 165 | 220 |
| 2020 | 219 | 308 |
| 2021 | 241 | 279 |
| 2022 | 237 | 373 |
| 2023 | 253 | 416 |
| 2024 | 300 | 420 |
| 2025 | 335 | 382 |
| 2026 | 191 | 242 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for wireless-enabled object location, tracking, and direction provision6 Oct 2026US 12,753,905 B2Fedex Dataworks, Inc.
- Subject tracking systems for a movable imaging system6 Oct 2026US 12,755,526 B2GoPro, Inc.
- Positionining measurement method and apparatus, communication device, and storage medium29 Sep 2026US 12,748,204 B2Beijing Xiaomi Mobile Software Co., Ltd.
- Positioning method using wireless communication, and electronic device for supporting same29 Sep 2026US 12,748,205 B2Samsung Electronics Co., Ltd.
- Estimating UE orientation based on antenna phase center (APC) information22 Sep 2026US 12,742,874 B2QUALCOMM Incorporated
- Methods and devices for wifi fine timing measurement8 Oct 2026US 2026/0309863 A1Samsung Electronics Co., Ltd.
- Method and apparatus for round hopping in hyper block for ultra-wideband communication8 Oct 2026US 2026/0312620 A1Samsung Electronics Co., Ltd.
- Sidelink positioning for multiple target user equipment8 Oct 2026US 2026/0313591 A1Apple Inc.
- Bluetooth ranging correction method and apparatus, initiator, and medium1 Oct 2026US 2026/0299115 A1Kunshan Telink Semiconductor Co., Ltd.
- Device type and location resolution in a wireless fidelity (wi-fi) network1 Oct 2026US 2026/0304370 A1Plume Design, Inc.
Most cited
By later US patents
- Geographic-based communication service system with more precise determination of a user's known geographic location764US 6,414,635 B1Wayport, Inc. · 2002
- Managing assets with active electronic tags753US 5,774,876 APar Government Systems Corporation · 1998
- Transponder arrangement613US 5,053,774 ATexas Instruments Deutschland GmbH · 1991
- Measuring distance593US 5,959,568 APar Goverment Systems Corporation · 1999
- Method and apparatus for identifying locating or monitoring equipment or other objects584US 5,910,776 AID Technologies, Inc. · 1999