G01N 21/455
Schlieren methods
Official title: {Schlieren methods, e.g. for gradient index determination; Shadowgraph}
G01N21/455 (Schlieren methods) appears on 50 US grants and 48 published applications in this corpus.
Search patents in G01N- Granted patents
- 50
- Published applications
- 48
- Assignees
- 39
- Inventors
- 89
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 1 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 2 |
| 2016 | 2 | 3 |
| 2017 | 2 | 2 |
| 2018 | 1 | 3 |
| 2019 | 3 | 2 |
| 2020 | 3 | 4 |
| 2021 | 0 | 2 |
| 2022 | 3 | 8 |
| 2023 | 4 | 7 |
| 2024 | 4 | 3 |
| 2025 | 7 | 2 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Optical test apparatus and optical test method8 Sep 2026US 12,730,253 B2Kabushiki Kaisha Toshiba
- Schlieren system for in-situ/online monitoring of spatter in large-area melt pool5 May 2026US 12,619,069 B2Wuhan University of Science and Technology
- Real-time, reference-free background oriented schlieren imaging system31 Mar 2026US 12,590,891 B2United States of America as represented by the Administrator of NASA
- Visualizing catheter irrigation using schlieren images21 Oct 2025US 12,449,672 B2Biosense Webster (Israel) Ltd.
- Method for detecting primary gas flows in flow chambers, use of a gas mixture therefor and gas mixture14 Oct 2025US 12,442,763 B2La Vision GmbH
- One- and Two-Dimensional Spectral-Spatial Filters7 May 2026US 2026/0126383 A1United States of America as represented by the Administrator of NASA
- Method for analysing a spray generated by a device for dispensing fluid pharmaceutical product9 Apr 2026US 2026/0097411 A1Aptar France SAS
- Optical test apparatus and optical test method19 Feb 2026US 2026/0049931 A1Kabushiki Kaisha Toshiba
- Schlieren system for in-situ/online monitoring of spatter in large-area melt pool9 Oct 2025US 2025/0314878 A1Wuhan University of Science and Technology
- Image capturing system and image capturing method27 Mar 2025US 2025/0104206 A1Mitsubishi Electric Corporation
Most cited
By later US patents
- Schlieren method for imaging semiconductor device properties88US 6,181,416 B2Optometrix, Inc. · 2001
- Method of detecting weather conditions in the atmosphere77US 6,034,760 AFlight Safety Technologies, Inc. · 2000
- Apparatus for two or three dimensional optical inspection of a sample41US 5,583,632 ANew Creation Co., Ltd. · 1996
- Methods for detecting inhomogeneities, specifically, striae, infused silica glasses21US 5,764,345 ACorning Incorporated · 1998
- Optical test apparatus and optical test method20US 10,732,102 B2Kabushiki Kaisha Toshiba · 2020