G01N 27/72
Investigating or analysing materials by the use of electric, electrochemical, or magnetic
Official title: by investigating magnetic variables
G01N27/72 (Investigating or analysing materials by the use of electric, electrochemical, or magnetic) appears on 3,208 US grants and 2,850 published applications in this corpus.
Search patents in G01N- Granted patents
- 3,208
- Published applications
- 2,850
- Assignees
- 1,554
- Inventors
- 6,540
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 34 | 0 |
| 1977 | 25 | 0 |
| 1978 | 35 | 0 |
| 1979 | 16 | 0 |
| 1980 | 22 | 0 |
| 1981 | 23 | 0 |
| 1982 | 25 | 0 |
| 1983 | 16 | 0 |
| 1984 | 39 | 0 |
| 1985 | 37 | 0 |
| 1986 | 38 | 0 |
| 1987 | 55 | 0 |
| 1988 | 39 | 0 |
| 1989 | 59 | 0 |
| 1990 | 36 | 0 |
| 1991 | 48 | 0 |
| 1992 | 42 | 0 |
| 1993 | 32 | 0 |
| 1994 | 46 | 0 |
| 1995 | 58 | 0 |
| 1996 | 54 | 0 |
| 1997 | 36 | 0 |
| 1998 | 43 | 0 |
| 1999 | 37 | 0 |
| 2000 | 40 | 0 |
| 2001 | 41 | 9 |
| 2002 | 52 | 43 |
| 2003 | 47 | 67 |
| 2004 | 60 | 77 |
| 2005 | 52 | 64 |
| 2006 | 55 | 62 |
| 2007 | 48 | 69 |
| 2008 | 38 | 74 |
| 2009 | 41 | 75 |
| 2010 | 43 | 118 |
| 2011 | 53 | 94 |
| 2012 | 75 | 112 |
| 2013 | 85 | 114 |
| 2014 | 72 | 142 |
| 2015 | 108 | 151 |
| 2016 | 138 | 139 |
| 2017 | 134 | 140 |
| 2018 | 123 | 175 |
| 2019 | 149 | 177 |
| 2020 | 173 | 184 |
| 2021 | 139 | 137 |
| 2022 | 151 | 150 |
| 2023 | 111 | 138 |
| 2024 | 112 | 119 |
| 2025 | 96 | 122 |
| 2026 | 77 | 98 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and tool for inspecting the condition of the internal surface of pipes6 Oct 2026US 12,753,874 B2Petroleo Brasileiro S.A. - Petrobras
- Magnetic ultrasound testing system6 Oct 2026US 12,754,167 B2Simply AUT Ltd.
- C-scan data merging6 Oct 2026US 12,754,168 B2Evident Canada, Inc.
- Electromagnetic inductive coupling analysis (EMICA) for on-board or in-lab detection of defects in thick or thin carbon fiber laminates29 Sep 2026US 12,748,074 B2TDA Research, Inc.
- Management system and management method29 Sep 2026US 12,748,235 B2Sintokogio, Ltd.
- Array probe jig8 Oct 2026US 2026/0309673 A1Mitsubishi Heavy Industries, Ltd.
- Method for rapid localization of dam leakage passage based on gradient measurement of total magnetic field1 Oct 2026US 2026/0298765 A1Central South University
- Excessive attraction detection device1 Oct 2026US 2026/0298874 A1SMC Corporation
- Composite detection apparatus and method of pulsed eddy current and magnetic flux leakage in oil and gas pipeline24 Sep 2026US 2026/0287125 A1China Special Equipment Inspection & Research Institute
- Multimodal processing of pulsed eddy current response signal for well integrity evaluation24 Sep 2026US 2026/0287553 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Rotary drill bit including polycrystalline diamond cutting elements320US 7,866,418 B2US Synthetic Corporation · 2011
- Methods for manipulating moieties in microfluidic systems281US 7,081,192 B1Aviva Biosciences Corporation · 2006
- Three magnet casing collar locator243US 4,808,925 AHalliburton Company · 1989
- Apparatus and method for performing non-destructive inspections of large area aircraft structures201US 6,220,099 B1CE Nuclear Power LLC · 2001
- Giant magnetorestive sensors and sensor arrays for detection and imaging of anomalies in conductive materials200US 6,150,809 ATPL, Inc. · 2000