G01R 33/448
Relaxometry, i.e. quantification of relaxation times or spin density
Official title: {Relaxometry, i.e. quantification of relaxation times or spin density (G01R33/50 takes precedence)}
G01R33/448 (Relaxometry, i.e. quantification of relaxation times or spin density) appears on 383 US grants and 462 published applications in this corpus.
Search patents in G01R- Granted patents
- 383
- Published applications
- 462
- Assignees
- 180
- Inventors
- 837
- Latest grant
- 11 Aug 2026
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|---|---|---|
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| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
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| 2005 | 0 | 2 |
| 2006 | 0 | 1 |
| 2007 | 4 | 2 |
| 2008 | 0 | 8 |
| 2009 | 5 | 4 |
| 2010 | 4 | 12 |
| 2011 | 3 | 5 |
| 2012 | 5 | 13 |
| 2013 | 10 | 23 |
| 2014 | 10 | 19 |
| 2015 | 6 | 23 |
| 2016 | 8 | 45 |
| 2017 | 23 | 45 |
| 2018 | 24 | 30 |
| 2019 | 60 | 38 |
| 2020 | 39 | 39 |
| 2021 | 46 | 43 |
| 2022 | 36 | 37 |
| 2023 | 36 | 30 |
| 2024 | 26 | 16 |
| 2025 | 19 | 21 |
| 2026 | 13 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Method for generating synthetic T1-T2 maps from marginal distributions of nuclear magnetic resonance logging tools9 Jun 2026US 12,650,535 B2Petroleo Brasileiro S.A. - Petrobras
- Method for establishing mathematical model of relationship between spontaneous imbibition volume and time of porous medium21 Apr 2026US 12,607,583 B2China University of Geosciences (Beijing)
- Method and apparatus for measuring brain free water content and MRI system7 Apr 2026US 12,593,999 B2Henan Provincial People's Hospital
- First half echo inclusion in nuclear magnetic resonance data17 Mar 2026US 12,578,290 B2Halliburton Energy Services.Inc.
- Identification method of haina polysaccharide by nuclear magnetic resonance spectroscopy10 Sep 2026US 2026/0266748 A1Harbin Hongdoushan Bio-Pharm Co., Ltd.
- Method to determine the water saturation using the t1/t2 ratio for conventional and unconventional formations16 Jul 2026US 2026/0202365 A1Schlumberger Technology Corporation
- Nuclear magnetic resonance (nmr) ringing noise measurements in well systems4 Jun 2026US 2026/0153584 A1Halliburton Energy Services.Inc.
- Methods to perform nuclear magnetic resonance measurements, and nuclear magnetic resonance tools4 Jun 2026US 2026/0153640 A1Halliburton Energy Services.Inc.
- Characterizing effects of co2 chemical reaction with rock minerals during carbon capture and sequestration30 Apr 2026US 2026/0118298 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Nuclear magnetic resonance pulse sequences for use with borehole logging tools181US 5,023,551 ASchlumberger-Doll Research · 1991
- Borehole measurement of NMR characteristics of earth formations141US 5,055,787 ASchlumberger Technology Corporation · 1991
- Borehole measurement of NMR characteristics of earth formations106US 5,055,788 ASchlumberger Technology Corporation · 1991
- NMR systems and methods for the rapid detection of analytes39US 8,409,807 B2T2 Biosystems, Inc. · 2013
- NMR systems and methods for the rapid detection of analytes35US 8,563,298 B2T2 Biosystems, Inc. · 2013