- All sections
- F - Mechanical engineering; lighting; heating; weapons; blasting
- F16J - Pistons; cylinders; pressure vessels in general; sealings
- F16J 15/447 - Labyrinth packings
Patent holdings for IPC class F16J 15/447
Total number of patents in this class: 774
10-year publication summary
|
87
|
90
|
89
|
78
|
56
|
55
|
48
|
43
|
36
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Mitsubishi Heavy Industries, Ltd. | 8538 |
48 |
| NOK Corporation | 2166 |
41 |
| Mitsubishi Hitachi Power Systems, Ltd. | 995 |
36 |
| NTN Corporation | 4976 |
34 |
| Mitsubishi Power, Ltd. | 1737 |
34 |
| Rtx Corporation | 9109 |
29 |
| Safran Aircraft Engines | 6039 |
21 |
| Inpro/Seal LLC | 79 |
19 |
| General Electric Company | 17789 |
18 |
| Mitsubishi Heavy Industries Compressor Corporation | 620 |
15 |
| Schaeffler Technologies AG & Co. KG | 9395 |
14 |
| Aktiebolaget SKF | 2839 |
14 |
| Stein Seal Company | 69 |
14 |
| Siemens AG | 24565 |
13 |
| NSK Ltd. | 2738 |
12 |
| Uchiyama Manufacturing Corp. | 124 |
11 |
| Pratt & Whitney Canada Corp. | 4442 |
10 |
| AES Engineering Ltd. | 87 |
9 |
| Rolls-Royce Corporation | 1719 |
9 |
| SEW-EURODRIVE GmbH & Co. KG | 1917 |
9 |
| Other owners | 364 |