G01N 21/91
Using penetration of dyes
Official title: using penetration of dyes, e.g. fluorescent ink
G01N21/91 (Using penetration of dyes) appears on 279 US grants and 210 published applications in this corpus.
Search patents in G01N- Granted patents
- 279
- Published applications
- 210
- Assignees
- 182
- Inventors
- 613
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 23 | 0 |
| 1977 | 9 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 9 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 6 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 5 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 4 | 9 |
| 2003 | 10 | 6 |
| 2004 | 4 | 4 |
| 2005 | 8 | 7 |
| 2006 | 6 | 6 |
| 2007 | 3 | 7 |
| 2008 | 5 | 7 |
| 2009 | 0 | 3 |
| 2010 | 7 | 6 |
| 2011 | 4 | 8 |
| 2012 | 3 | 14 |
| 2013 | 6 | 9 |
| 2014 | 8 | 9 |
| 2015 | 10 | 10 |
| 2016 | 11 | 8 |
| 2017 | 10 | 16 |
| 2018 | 13 | 12 |
| 2019 | 11 | 10 |
| 2020 | 9 | 15 |
| 2021 | 10 | 12 |
| 2022 | 7 | 7 |
| 2023 | 5 | 10 |
| 2024 | 8 | 6 |
| 2025 | 7 | 6 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Evaluation apparatus, evaluation method, and evaluation program17 Mar 2026US 12,579,647 B2Resonac Corporation
- Rapid real-time visualization method and system for crack initiation process of concrete component10 Mar 2026US 12,571,741 B2Nanjing Hydraulic Research Institute
- Component assessment method and apparatus13 Jan 2026US 12,524,864 B2General Electric Company
- Rare earth complex-containing composition and fluorescent penetrant inspection method using same2 Dec 2025US 12,486,453 B2Kabushiki Kaisha Toshiba
- Crimping determination device, crimping determination method, crimping determination program, wire harness processing device, and wire harness processing method14 Oct 2025US 12,442,747 B2Kabushiki Kaisha Toshiba
- Radio opaque penetrant formulation for material testing17 Sep 2026US 2026/0276556 A1Illinois Tool Works Inc.
- System and method for automatically validating the response compliance of a penetrant testing line11 Jun 2026US 2026/0160703 A1
- Fluorescent penetrant inspection apparatus4 Dec 2025US 2025/0369802 A1Toyota Jidosha Kabushiki Kaisha
- Non-destructive testing method for component inspection7 Aug 2025US 2025/0251349 A1Pratt & Whitney Canada Corp.
- Method for observing surface17 Jul 2025US 2025/0231116 A1Kyoto University
Most cited
By later US patents
- Method and apparatus for leak detection and non-destructive testing118US 6,177,678 B1Brasscorp Limited · 2001
- Fault locating device, system and method108US 5,804,822 ABrasscorp Limited · 1998
- Automated repair method and system91US 8,996,156 B2Siemens Aktiengesellschaft · 2015
- Organic solvent based ink for invisible marking/identification84US 5,990,197 AEastman Chemical Company · 1999
- Sterilizable package with tear-off indicators74US 4,121,714 AFaser Industries · 1978