- All sections
- F - Mechanical engineeringlightingheatingweaponsblasting
- F01C - Rotary-piston or oscillating-piston machines or engines
- F01C 21/08 - Rotary pistons
Patent holdings for IPC class F01C 21/08
Total number of patents in this class: 520
10-year publication summary
|
66
|
82
|
65
|
39
|
54
|
43
|
34
|
15
|
20
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| LG Electronics Inc. | 71880 |
39 |
| Pratt & Whitney Canada Corp. | 4477 |
37 |
| Pierburg Pump Technology GmbH | 322 |
10 |
| Hitachi Astemo, Ltd. | 6283 |
10 |
| Joma-Polytec GmbH | 50 |
9 |
| Robert Bosch GmbH | 42170 |
8 |
| LiquidPiston, Inc. | 47 |
8 |
| Rotoliptic Technologies Incorporated | 20 |
8 |
| Mitsubishi Electric Corporation | 45414 |
6 |
| Exponential Technologies, Inc. | 36 |
6 |
| Fujitsu General Limited | 588 |
6 |
| Vhit S.p.A. | 62 |
6 |
| FeTu Limited | 17 |
6 |
| Danfoss A/S | 1342 |
6 |
| GREE Green Refrigeration Technology Center Co., Ltd. of Zhuhai | 162 |
5 |
| Greystone Technologies Pty Ltd | 10 |
5 |
| Joma-hydromechanic GmbH | 17 |
5 |
| KYB Corporation | 1344 |
5 |
| Mallen Research Limited Partnership | 6 |
5 |
| Mathers Hydraulics Technologies Pty Ltd | 19 |
5 |
| Other owners | 325 |