- All sections
- F - Mechanical engineeringlightingheatingweaponsblasting
- F28F - Details of heat-exchange or heat-transfer apparatus, of general application
- F28F 1/40 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
Patent holdings for IPC class F28F 1/40
Total number of patents in this class: 760
10-year publication summary
|
61
|
76
|
69
|
64
|
50
|
61
|
30
|
41
|
21
|
5
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Mitsubishi Electric Corporation | 47522 |
50 |
| Denso Corporation | 25132 |
30 |
| Calsonic Kansei Corporation | 554 |
17 |
| Hamilton Sundstrand Corporation | 5013 |
15 |
| General Electric Company | 13811 |
14 |
| Daikin Industries, Ltd. | 10378 |
14 |
| China Petroleum & Chemical Corporation | 2027 |
13 |
| Valeo Systemes Thermiques | 2808 |
12 |
| Wieland-Werke AG | 352 |
12 |
| NGK Insulators, Ltd. | 5180 |
11 |
| Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation | 296 |
11 |
| MAHLE International GmbH | 2861 |
9 |
| Mitsubishi Heavy Industries, Ltd. | 9010 |
8 |
| ExxonMobil Chemical Patents Inc. | 3852 |
8 |
| Hanon Systems | 2059 |
8 |
| UACJ Corporation | 723 |
8 |
| LG Electronics Inc. | 74848 |
7 |
| Carrier Corporation | 3972 |
7 |
| Kubota Corporation | 4202 |
7 |
| Heatcraft Refrigeration Products LLC | 262 |
6 |
| Other owners | 493 |