F04B 2203/0404
Frequency of the electric current
F04B2203/0404 (Frequency of the electric current) appears on 53 US grants and 59 published applications in this corpus.
Search patents in F04B- Granted patents
- 53
- Published applications
- 59
- Assignees
- 31
- Inventors
- 126
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 3 |
| 2004 | 5 | 3 |
| 2005 | 2 | 1 |
| 2006 | 1 | 3 |
| 2007 | 0 | 2 |
| 2008 | 1 | 1 |
| 2009 | 1 | 3 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 1 | 1 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 3 | 1 |
| 2017 | 0 | 18 |
| 2018 | 4 | 5 |
| 2019 | 13 | 3 |
| 2020 | 3 | 5 |
| 2021 | 1 | 3 |
| 2022 | 6 | 1 |
| 2023 | 2 | 2 |
| 2024 | 2 | 1 |
| 2025 | 3 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electronic vaporiser system28 Jul 2026US 12,690,610 B2Ayr Ltd.
- Microfluidic pump control18 Nov 2025US 12,473,905 B2Lee Ventus Ltd.
- Fluid control device27 May 2025US 12,313,054 B2Murata Manufacturing Co., Ltd.
- Electronic vaporizer system13 May 2025US 12,295,411 B2Ayr Ltd.
- Process and device for ventilating a patient23 Apr 2024US 11,964,108 B2Drägerwerk AG & Co. KGaA
- Electronic vaporiser system24 Jul 2025US 2025/0234920 A1Ayr Ltd.
- Microfluidic pump control25 Jul 2024US 2024/0247651 A1Lee Ventus Ltd.
- Fluid control device5 Oct 2023US 2023/0313790 A1Murata Manufacturing Co., Ltd.
- Electronic vaporiser system15 Jun 2023US 2023/0180826 A1Ayr Ltd.
- System and method for operating a pump in a humidifier25 Aug 2022US 2022/0265952 A1Koninklijke Philips N. V.
Most cited
By later US patents
- Linear motor110US 6,809,434 B1Fisher & Paykel Limited · 2004
- Driving apparatus of a linear compressor62US 6,832,898 B2Matsushita Electric Industrial Co., Ltd. · 2004
- Motor driving apparatus61US 7,151,348 B1Matsushita Electric Industrila Co., Ltd. · 2006
- Electronic vaporiser system56US 10,131,532 B2Beyond Twenty Ltd. · 2018
- Linear motor49US 6,864,647 B2Fisher & Paykel Limited · 2005