F04C 28/28
Safety arrangements
Official title: Safety arrangements; Monitoring
F04C28/28 (Safety arrangements) appears on 563 US grants and 485 published applications in this corpus.
Search patents in F04C- Granted patents
- 563
- Published applications
- 485
- Assignees
- 209
- Inventors
- 1,117
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 12 | 0 |
| 1993 | 12 | 0 |
| 1994 | 8 | 0 |
| 1995 | 15 | 0 |
| 1996 | 14 | 0 |
| 1997 | 12 | 0 |
| 1998 | 14 | 0 |
| 1999 | 7 | 0 |
| 2000 | 20 | 0 |
| 2001 | 20 | 5 |
| 2002 | 23 | 17 |
| 2003 | 17 | 26 |
| 2004 | 14 | 24 |
| 2005 | 15 | 14 |
| 2006 | 9 | 22 |
| 2007 | 14 | 7 |
| 2008 | 7 | 3 |
| 2009 | 7 | 12 |
| 2010 | 7 | 13 |
| 2011 | 6 | 12 |
| 2012 | 12 | 9 |
| 2013 | 12 | 14 |
| 2014 | 7 | 20 |
| 2015 | 10 | 20 |
| 2016 | 17 | 26 |
| 2017 | 16 | 29 |
| 2018 | 22 | 34 |
| 2019 | 28 | 23 |
| 2020 | 24 | 29 |
| 2021 | 15 | 24 |
| 2022 | 29 | 30 |
| 2023 | 26 | 24 |
| 2024 | 34 | 20 |
| 2025 | 19 | 18 |
| 2026 | 13 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Air compressor29 Sep 2026US 12,747,730 B2Hitachi Industrial Equipment Systems Co., Ltd.
- Compressor system having integrated ambient sensor15 Sep 2026US 12,736,051 B2Kaeser Kompressoren SE
- Vacuum pump11 Aug 2026US 12,704,127 B2Milwaukee Electric Tool Corporation
- Compressor/expander machine23 Jun 2026US 12,663,192 B2BITZER Kuehlmaschinenbau GmbH
- System ADN method for monitoring the oil level of an oil-lubricated compressor16 Jun 2026US 12,655,833 B2Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH
- Gas Compressor20 Aug 2026US 2026/0243258 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Hermetic compressor and refrigeration cycle apparatus30 Jul 2026US 2026/0218707 A1Mitsubishi Electric Corporation
- Predicting tip seal wear in scroll pump23 Jul 2026US 2026/0210358 A1Agilent Technologies, Inc.
- Determining tip seal maintenance requirement in scroll pump23 Jul 2026US 2026/0210359 A1Agilent Technologies, Inc.
- Hydrogen production apparatus for a wind turbine, wind turbine arrangement and method for operating a hydrogen production apparatus for a wind turbine2 Jul 2026US 2026/0185252 A1Siemens Gamesa Renewable Energy A/S
Most cited
By later US patents
- Scroll-type machine with axially compliant mounting226US 4,877,382 ACopeland Corporation · 1989
- Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor194US 6,047,557 ACopeland Corporation · 2000
- Vibration monitoring system191US 5,602,757 AIngersoll-Rand Company · 1997
- Compressor diagnostic system172US 6,615,594 B2Copeland Corporation · 2003
- Method and apparatus for analyzing rotating machines168US 5,109,700 ALife Systems, Inc. · 1992