F04D 27/0261
By varying driving speed
Official title: {by varying driving speed}
F04D27/0261 (By varying driving speed) appears on 314 US grants and 348 published applications in this corpus.
Search patents in F04D- Granted patents
- 314
- Published applications
- 348
- Assignees
- 174
- Inventors
- 737
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 3 | 4 |
| 2003 | 2 | 5 |
| 2004 | 6 | 5 |
| 2005 | 1 | 11 |
| 2006 | 4 | 5 |
| 2007 | 4 | 8 |
| 2008 | 7 | 9 |
| 2009 | 3 | 14 |
| 2010 | 4 | 9 |
| 2011 | 6 | 7 |
| 2012 | 8 | 15 |
| 2013 | 16 | 21 |
| 2014 | 10 | 21 |
| 2015 | 10 | 17 |
| 2016 | 9 | 19 |
| 2017 | 14 | 24 |
| 2018 | 14 | 15 |
| 2019 | 17 | 20 |
| 2020 | 21 | 15 |
| 2021 | 13 | 28 |
| 2022 | 21 | 23 |
| 2023 | 21 | 15 |
| 2024 | 19 | 15 |
| 2025 | 26 | 22 |
| 2026 | 10 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods and systems of compressor control with surge avoidance and response7 Jul 2026US 12,674,487 B2
- Control device that detects surging30 Jun 2026US 12,669,130 B2Mitsubishi Heavy Industries, Ltd.
- Method for operating an electrolysis system, and electrolysis system5 May 2026US 12,618,167 B2Siemens Energy Global GmbH & Co. KG
- Compressor7 Apr 2026US 12,595,793 B2Hitachi Industrial Equipment Systems Co., Ltd.
- Fuel cell system having an air compressor and a driving control method for a motor of the air compressor7 Apr 2026US 12,597,620 B2Hyundai Motor Company
- Compressed-air system8 Jan 2026US 2026/0009395 A1
- Magnetic bearing control device, magnetic bearing device, and turbo machine11 Dec 2025US 2025/0377016 A1Daikin Industries, Ltd.
- Varying Turbo Pump Speed to Optimize Pressure Levels within a Mass Spectrometer4 Dec 2025US 2025/0372361 A1Thermo Finnigan LLC
- Method for a compressor arrangement for a vehicle with a fuel cell system30 Oct 2025US 2025/0336994 A1ZF CV Systems Global GmbH
- Method for operating an electrolysis system, and electrolysis system14 Aug 2025US 2025/0257488 A1Siemens Energy Global GmbH & Co. KG
Most cited
By later US patents
- Control system for regulating large capacity rotating machinery131US 4,151,725 ABorg-Warner Corporation · 1979
- Control system for an air conditioning/refrigeration system120US 5,203,179 AEcoair Corp. · 1993
- Control system for an air conditioning/refrigeration system101US 5,335,507 AEcoair Corporated · 1994
- Evacuating unit with reduced diameter exhaust duct92US 6,474,949 B1Ebara Corporation · 2002
- Control method and apparatus for a centrifugal chiller using a variable speed impeller motor drive77US 5,355,691 AAmerican Standard Inc. · 1994