- All sections
- F - Mechanical engineering; lighting; heating; weapons; blasting
- F04C - Rotary-piston, or oscillating-piston, positive-displacement machines for liquids; rotary-piston, or oscillating-piston, positive-displacement pumps
- F04C 18/22 - Rotary-piston pumps specially adapted for elastic fluids of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth-equivalents than the outer member
Patent holdings for IPC class F04C 18/22
Total number of patents in this class: 37
10-year publication summary
|
2
|
3
|
4
|
3
|
4
|
7
|
7
|
5
|
4
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Korea Atomic Energy Research Institute | 418 |
5 |
| GREE Electric Appliances, Inc. of Zhuhai | 3007 |
4 |
| Illinois Tool Works Inc. | 11152 |
3 |
| RPC Engineering Limited Liability Company | 5 |
3 |
| ACIST Medical Systems, Inc. | 315 |
2 |
| Edwards Limited | 764 |
2 |
| Maruko Keihoki Co., Ltd. | 5 |
2 |
| International Business Machines Corporation | 60644 |
1 |
| Pratt & Whitney Canada Corp. | 4215 |
1 |
| Hyundai Motor Company | 19021 |
1 |
| Daikin Industries, Ltd. | 9495 |
1 |
| Kia Motors Corporation | 7946 |
1 |
| Fujitsu General Limited | 541 |
1 |
| Genesis Advanced Technology Inc. | 51 |
1 |
| KT Projektentwicklungs-GmbH | 28 |
1 |
| Randell Technologies Inc. | 2 |
1 |
| Rini Technologies, Inc. | 4 |
1 |
| Stackpole International Engineered Products, Ltd. | 46 |
1 |
| Toshiba Carrier Corporation | 567 |
1 |
| Epitrochoidal Compressors Ltd. | 2 |
1 |
| Other owners | 3 |