G01N 27/84
By applying magnetic powder or magnetic ink
Official title: by applying magnetic powder or magnetic ink
G01N27/84 (By applying magnetic powder or magnetic ink) appears on 84 US grants and 39 published applications in this corpus.
Search patents in G01N- Granted patents
- 84
- Published applications
- 39
- Assignees
- 66
- Inventors
- 167
- Latest grant
- 10 Jun 2025
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 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 6 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 1 | 1 |
| 2007 | 1 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 2 |
| 2012 | 1 | 3 |
| 2013 | 2 | 1 |
| 2014 | 4 | 4 |
| 2015 | 1 | 2 |
| 2016 | 2 | 1 |
| 2017 | 1 | 0 |
| 2018 | 2 | 1 |
| 2019 | 1 | 9 |
| 2020 | 1 | 3 |
| 2021 | 4 | 3 |
| 2022 | 2 | 0 |
| 2023 | 1 | 1 |
| 2024 | 1 | 1 |
| 2025 | 2 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Magnetic particle testing for an axle of an aircraft landing gear10 Jun 2025US 12,326,419 B2Goodrich Corporation
- Magnetizing apparatus and magnetizing method13 May 2025US 12,300,412 B2Yokogawa Electric Corporation
- Systems and methods to use customized quality control tasks for non-destructive testing9 Jan 2024US 11,867,774 B2Illinois Tool Works Inc.
- Non-destructive inspection method16 May 2023US 11,652,243 B2Konica Minolta, Inc.
- Snap-fit lighting attachments for use in conjunction with magnetization equipment during non-destructive testing (NDT)16 Aug 2022US 11,415,300 B2Illinois Tool Works Inc.
- Digital portable magentic particle tester31 Jul 2025US 2025/0244224 A1Saudi Arabian Oil Company
- Surface inspection device and surface inspection method17 Jul 2025US 2025/0231120 A1Nippon Steel Corporation
- Magnetic particle testing for an axle of an aircraft landing gear17 Oct 2024US 2024/0345027 A1Goodrich Corporation
- Magnetizing apparatus and magnetizing method20 Apr 2023US 2023/0119946 A1Yokogawa Electric Corporation
- Snap-fit lighting attachments for use in conjunction with magnetization equipment during non-destructive testing (ndt)29 Jul 2021US 2021/0231297 A1Illinois Tool Works Inc.
Most cited
By later US patents
- Stable ferrofluid compositions and method of making same87US 4,356,098 AFerrofluidics Corporation · 1982
- Magnetic particle inspection apparatus with enhanced uniformity of magnetization37US 4,931,731 A1990
- Process for the preparation of aqueous magnetic material suspensions31US 4,019,994 AGeorgia-Pacific Corporation · 1977
- Lignosulfonate composition and process for its preparation25US 4,019,995 AGeorgia-Pacific Corporation · 1977
- Borehole fracture detection using magnetic powder22US 4,491,796 AShell Oil Company · 1985