G01R 23/177
Analysis of very low frequencies
G01R23/177 (Analysis of very low frequencies) appears on 12 US grants and 11 published applications in this corpus.
Search patents in G01R- Granted patents
- 12
- Published applications
- 11
- Assignees
- 8
- Inventors
- 19
- Latest grant
- 12 Nov 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 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 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 3 |
| 2020 | 2 | 1 |
| 2021 | 2 | 5 |
| 2022 | 1 | 0 |
| 2023 | 1 | 0 |
| 2024 | 3 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method and apparatus for detecting low-frequency oscillations12 Nov 2024US 12,142,923 B2Wobben Properties GmbH
- Wind turbine and method for detecting low-frequency oscillations in an electrical supply grid20 Aug 2024US 12,066,474 B2Wobben Properties GmbH
- Wind turbine and method for detecting low-frequency oscillations in an electrical supply grid13 Feb 2024US 11,899,050 B2Wobben Properties GmbH
- Wind energy system and method for identifying low-frequency oscillations in an electrical supply network23 May 2023US 11,658,490 B2Wobben Properties GmbH
- Method and device for detection of sub-synchronous oscillations in a power system8 Nov 2022US 11,495,969 B2Siemens Aktiengesellschaft
- Wind turbine and method for detecting low-frequency oscillations in an electrical supply grid4 Nov 2021US 2021/0341523 A1Wobben Properties GmbH
- Method and apparatus for detecting low-frequency oscillations9 Sep 2021US 2021/0281071 A1Wobben Properties GmbH
- Method and device for detection of sub-synchronous oscillations in a power system26 Aug 2021US 2021/0265840 A1Siemens Aktiengesellschaft
- Wind turbine and method for detecting low-frequency oscillations in an electrical supply grid8 Jul 2021US 2021/0208186 A1Wobben Properties GmbH
- Wind energy system and method for identifying low-frequency oscillations in an electrical supply network27 May 2021US 2021/0159705 A1Wobben Properties GmbH
Most cited
By later US patents
- Multiple thin film absorption of reflected substrate modes in waveguide system16US 4,372,642 AThe United States of America as represented by the Secretary of the Navy · 1983
- Dual mode tone detector circuit5US 4,410,762 AMotorola, Inc. · 1983
- Harmonic detection system1US 10,951,059 B2OMRON Corporation · 2021
- Method and device for detection of sub-synchronous oscillations in a power system1US 11,495,969 B2Siemens Aktiengesellschaft · 2022