- All sections
- G - Physics
- G01N - Investigating or analysing materials by determining their chemical or physical properties
- G01N 21/91 - Investigating the presence of flaws, defects or contamination using penetration of dyes, e.g. fluorescent ink
Patent holdings for IPC class G01N 21/91
Total number of patents in this class: 147
10-year publication summary
12
|
8
|
20
|
8
|
8
|
18
|
9
|
11
|
12
|
3
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Illinois Tool Works Inc. | 11152 |
13 |
Safran Aircraft Engines | 5739 |
6 |
MTU Aero Engines AG | 622 |
4 |
General Electric Company | 18133 |
3 |
Siemens AG | 24990 |
3 |
The Boeing Company | 19843 |
3 |
Bio-Rad Laboratories, Inc. | 1592 |
3 |
Chemetall GmbH | 382 |
3 |
Universitat Heidelberg | 217 |
3 |
KLA Corporation | 1223 |
3 |
SNECMA S.A. | 1160 |
2 |
International Business Machines Corporation | 60644 |
2 |
Rolls-Royce PLC | 2944 |
2 |
Life Technologies Corporation | 3068 |
2 |
Henkel AG & Co. KGaA | 10129 |
2 |
ams AG | 807 |
2 |
Bell Helicopter Textron Inc. | 1122 |
2 |
Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
2 |
Nippon Steel Corporation | 5649 |
2 |
Rolls-Royce Corporation | 1686 |
2 |
Other owners | 83 |