- 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: 158
10-year publication summary
|
20
|
8
|
8
|
18
|
9
|
11
|
12
|
7
|
17
|
2
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Illinois Tool Works Inc. | 11763 |
13 |
| Safran Aircraft Engines | 6562 |
6 |
| MTU Aero Engines AG | 713 |
5 |
| Nippon Steel Corporation | 6738 |
5 |
| General Electric Company | 13816 |
4 |
| SMC Corporation | 1379 |
4 |
| Siemens AG | 24177 |
3 |
| Bio-Rad Laboratories, Inc. | 1612 |
3 |
| Chemetall GmbH | 387 |
3 |
| Universitat Heidelberg | 275 |
3 |
| KLA Corporation | 1795 |
3 |
| SNECMA S.A. | 1148 |
2 |
| The Boeing Company | 20094 |
2 |
| Nikon Corporation | 7292 |
2 |
| Rolls-Royce PLC | 3181 |
2 |
| ams AG | 757 |
2 |
| Bell Helicopter Textron Inc. | 969 |
2 |
| Consolidated Nuclear Security, LLC | 118 |
2 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2835 |
2 |
| Rolls-Royce Corporation | 1680 |
2 |
| Other owners | 88 |