- 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: 143
10-year publication summary
|
12
|
12
|
8
|
20
|
8
|
8
|
18
|
9
|
11
|
2
|
| 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Illinois Tool Works Inc. | 10983 |
15 |
| Safran Aircraft Engines | 5358 |
6 |
| Siemens AG | 26322 |
4 |
| General Electric Company | 25481 |
3 |
| The Boeing Company | 20387 |
3 |
| Rolls-Royce PLC | 2999 |
3 |
| Bio-Rad Laboratories, Inc. | 1549 |
3 |
| Chemetall GmbH | 382 |
3 |
| Universitat Heidelberg | 194 |
3 |
| SNECMA S.A. | 1196 |
2 |
| International Business Machines Corporation | 63200 |
2 |
| Life Technologies Corporation | 2910 |
2 |
| Henkel AG & Co. KGaA | 9831 |
2 |
| ams AG | 854 |
2 |
| Bell Helicopter Textron Inc. | 1181 |
2 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2804 |
2 |
| MTU Aero Engines AG | 587 |
2 |
| Nanoco Technologies Ltd. | 185 |
2 |
| National Maritime Research Institute | 22 |
2 |
| Rolls-Royce Corporation | 1621 |
2 |
| Other owners | 78 |