F04C 2270/09
Electric current frequency
F04C2270/09 (Electric current frequency) appears on 22 US grants and 26 published applications in this corpus.
Search patents in F04C- Granted patents
- 22
- Published applications
- 26
- Assignees
- 25
- Inventors
- 57
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 2 |
| 2016 | 1 | 0 |
| 2017 | 0 | 2 |
| 2018 | 1 | 3 |
| 2019 | 2 | 0 |
| 2020 | 2 | 1 |
| 2021 | 0 | 5 |
| 2022 | 2 | 5 |
| 2023 | 4 | 1 |
| 2024 | 6 | 3 |
| 2025 | 1 | 0 |
By publication year.
Subgroups
Granted patents
Recent patents
- Electric compressor with integrated sensor(s)30 Dec 2025US 12,510,074 B2Mahle International GmbH
- Vacuum pumping system having a plurality of positive displacement vacuum pumps and method for operating the same24 Dec 2024US 12,173,712 B2Agilent Technologies, Inc.
- Refrigerant bypass solution1 Oct 2024US 12,104,836 B2Schneider Electric It Corporation
- Freezing device9 Jul 2024US 12,031,760 B2Mitsubishi Electric Corporation
- Screw compressor and control method therefor9 Apr 2024US 11,953,006 B2Tyco Fire & Security GmbH
- Electric compressor with integrated sensor(s)26 Dec 2024US 2024/0426297 A1Mahle International GmbH
- Refrigerant bypass solution28 Mar 2024US 2024/0102710 A1Schneider Electric It Corporation
- Method and system for controling a pump25 Jan 2024US 2024/0027975 A1Grundfos Holding A/S
- Fluid pressure unit20 Jul 2023US 2023/0228266 A1Daikin Industries, Ltd.
- Freezing device28 Jul 2022US 2022/0235987 A1Mitsubishi Electric Corporation
Most cited
By later US patents
- Electric-motor-driven oil pump control system25US 8,475,137 B2Hitachi Automotive Systems, Ltd. · 2013
- Gas turbine engine fuel system7US 10,378,445 B2ROLLS-ROYCE plc · 2019
- Pumping system and method of operation4US 8,753,095 B2Edwards Limited · 2014
- Method for regulating the rotational speed of a compressor as a function of the available gas flow of a source and regulation thereby applied1US 10,815,997 B2Atlas Copco Airpower, Naamloze Vennootschap · 2020
- Electric compressor with integrated sensor(s)1US 12,510,074 B2Mahle International GmbH · 2025