G01N 27/83
By investigating stray magnetic fields
Official title: by investigating stray magnetic fields
G01N27/83 (By investigating stray magnetic fields) appears on 322 US grants and 315 published applications in this corpus.
Search patents in G01N- Granted patents
- 322
- Published applications
- 315
- Assignees
- 241
- Inventors
- 835
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 5 | 0 |
| 1983 | 0 | 0 |
| 1984 | 6 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 8 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 4 | 0 |
| 2002 | 3 | 1 |
| 2003 | 1 | 2 |
| 2004 | 1 | 2 |
| 2005 | 3 | 1 |
| 2006 | 1 | 3 |
| 2007 | 4 | 4 |
| 2008 | 1 | 7 |
| 2009 | 3 | 3 |
| 2010 | 3 | 11 |
| 2011 | 1 | 8 |
| 2012 | 5 | 7 |
| 2013 | 12 | 10 |
| 2014 | 8 | 10 |
| 2015 | 10 | 10 |
| 2016 | 9 | 11 |
| 2017 | 10 | 15 |
| 2018 | 12 | 25 |
| 2019 | 15 | 36 |
| 2020 | 19 | 27 |
| 2021 | 33 | 24 |
| 2022 | 25 | 26 |
| 2023 | 24 | 25 |
| 2024 | 18 | 17 |
| 2025 | 16 | 18 |
| 2026 | 11 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Wire rope inspection device7 Jul 2026US 12,673,847 B2Shimadzu Corporation
- Detection device19 May 2026US 12,631,594 B2TDK Corporation
- Method for determining the geometry of a defect and for determining a load limit19 May 2026US 12,631,595 B2Rosen IP AG
- System and method for automated acquisition and analysis of electromagnetic testing data5 May 2026US 12,618,803 B2National Bank of Canada
- Information processing system for nondestructive inspection and nondestructive inspection method28 Apr 2026US 12,613,221 B2Konica Minolta, Inc.
- Integrated magneto-optical imaging probe and parameter self-adjusting method thereof20 Aug 2026US 2026/0243729 A1China University of Petroleum (East China)
- Modular inline inspection vehicle9 Jul 2026US 2026/0194408 A1DarkVision Technologies Inc.
- Coiled tubing and casing inspection based on magnetic flux leakage measurements9 Jul 2026US 2026/0194491 A1Schlumberger Technology Corporation
- Magnetic particulate imaging device2 Jul 2026US 2026/0185916 A1Mitsubishi Electric Corporation
- Gradient-augmented saturation magnetization internal inspection device for oil and gas pipelines and method therefor2 Jul 2026US 2026/0185963 A1China Special Equipment Inspection & Research Institute
Most cited
By later US patents
- Nondestructive evaluation of pipes and tubes using magnetostrictive sensors138US 5,581,037 ASouthwest Research Institute · 1996
- Stable ferrofluid compositions and method of making same87US 4,356,098 AFerrofluidics Corporation · 1982
- Array for non-destructive material testing of cylindrical workpieces by means of electrodynamic ultrasonic measurement52US 5,279,160 ANukem GmbH · 1994
- ID-OD discrimination sensor concept for a magnetic flux leakage inspection tool49US 6,847,207 B1TDW Delaware, Inc. · 2005
- Inspection apparatus for electromagnetically detecting flaws in the wall of a pipe44US 4,510,447 AExxon Production Research Company · 1985