G01R 33/3678
Involving quadrature drive or detection
Official title: {involving quadrature drive or detection, e.g. a circularly polarized RF magnetic field}
G01R33/3678 (Involving quadrature drive or detection) appears on 269 US grants and 148 published applications in this corpus.
Search patents in G01R- Granted patents
- 269
- Published applications
- 148
- Assignees
- 103
- Inventors
- 397
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 11 | 0 |
| 1989 | 7 | 0 |
| 1990 | 5 | 0 |
| 1991 | 8 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 9 | 0 |
| 1995 | 9 | 0 |
| 1996 | 13 | 0 |
| 1997 | 10 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 8 | 0 |
| 2001 | 9 | 0 |
| 2002 | 5 | 6 |
| 2003 | 7 | 6 |
| 2004 | 7 | 2 |
| 2005 | 5 | 6 |
| 2006 | 6 | 8 |
| 2007 | 5 | 4 |
| 2008 | 3 | 6 |
| 2009 | 5 | 10 |
| 2010 | 7 | 6 |
| 2011 | 10 | 6 |
| 2012 | 4 | 6 |
| 2013 | 7 | 7 |
| 2014 | 5 | 4 |
| 2015 | 3 | 11 |
| 2016 | 4 | 6 |
| 2017 | 13 | 6 |
| 2018 | 5 | 8 |
| 2019 | 12 | 9 |
| 2020 | 9 | 10 |
| 2021 | 11 | 7 |
| 2022 | 11 | 5 |
| 2023 | 8 | 1 |
| 2024 | 2 | 5 |
| 2025 | 2 | 1 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Coil, coil assembly and method22 Sep 2026US 12,742,840 B2Forschungszentrum Julich GmbH
- Buried utility locator auto-tuning apparatus and methods8 Sep 2026US 12,730,167 B1Seescan, Inc.
- Radio frequency coil methods and apparatus21 Oct 2025US 12,446,832 B2Hyperfine Operations, Inc.
- Radio frequency receiving device9 Sep 2025US 12,411,194 B2Shanghai United Imaging Healthcare Co., Ltd.
- Buried utility locator auto-tuning apparatus and methods1 Oct 2024US 12,105,167 B1Seescan, Inc.
- Radio frequency coil methods and apparatus27 Aug 2026US 2026/0248457 A1Hyperfine Operations, Inc.
- Radio frequency coil and resonance assembly for magnetic resonance imaging system5 Mar 2026US 2026/0063739 A1GE Precision Healthcare LLC
- Sensor element, test device, and method for testing a data carrier having a spin resonance feature18 Sep 2025US 2025/0290879 A1Giesecke+Devrient Currency Technology GmbH
- Coil, coil assembly and method7 Nov 2024US 2024/0369654 A1Forschungszentrum Julich GmbH
- Half driving mode for degenerate birdcage coils and ladder coils17 Oct 2024US 2024/0345189 A1Quality Electrodynamics, LLC
Most cited
By later US patents
- Method of internal magnetic resonance imaging and spectroscopic analysis and associated apparatus268US 5,699,801 AThe Johns Hopkins University · 1997
- Miniature magnetic resonance catheter coils and related methods234US 6,263,229 B1The Johns Hopkins University School of Medicine · 2001
- Quadrature surface coil array194US 5,198,768 AElscint Ltd. · 1993
- MRI RF coil systems having detachable, relocatable, and or interchangeable sections and MRI imaging systems and methods employing the same185US 6,591,128 B1Koninklijke Philips Electronics N. V. · 2003
- Magnetic resonance whole body antenna system, elliptically polarized with major ellipse axis tilted/non-horizontal at least when unoccupied by an examination subject132US 8,362,775 B2Siemens Aktiengesellschaft · 2013