G01R 19/1658
Ac voltage or recurrent signals
Official title: {AC voltage or recurrent signals}
G01R19/1658 (Ac voltage or recurrent signals) appears on 60 US grants and 26 published applications in this corpus.
Search patents in G01R- Granted patents
- 60
- Published applications
- 26
- Assignees
- 63
- Inventors
- 109
- Latest grant
- 27 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 8 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 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 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 2 | 1 |
| 2011 | 0 | 0 |
| 2012 | 2 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 2 |
| 2018 | 0 | 2 |
| 2019 | 3 | 3 |
| 2020 | 3 | 3 |
| 2021 | 1 | 0 |
| 2022 | 3 | 3 |
| 2023 | 0 | 2 |
| 2024 | 1 | 3 |
| 2025 | 4 | 0 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Photovoltaic system, relay detection method, and power supply system27 Jan 2026US 12,537,374 B2Huawei Digital Power Technologies Co., Ltd.
- Protection circuit and method3 Jun 2025US 12,323,111 B2NXP B. V.
- Switch controller circuit and method for controlling switching27 May 2025US 12,316,210 B2TDK-Lambda UK Limited
- Voltage monitoring device25 Feb 2025US 12,235,295 B2Ablic Inc.
- Detection circuit for power supply circuit7 Jan 2025US 12,191,759 B2Power Forest Technology Corporation
- Winding switching device and winding switching system1 Oct 2026US 2026/0298988 A1Autonetworks Technologies, Ltd.
- Overcurrent Protection6 Aug 2026US 2026/0229873 A1Instagrid GmbH
- Dynamic timing for shutdown including asynchronous dynamic random access memory refresh (adr) due to ac undervoltage1 Aug 2024US 2024/0256290 A1Hewlett Packard Enterprise Development LP
- Photovoltaic system, relay detection method, and power supply system27 Jun 2024US 2024/0213767 A1Huawei Digital Power Technologies Co., Ltd.
- Detection circuit for power supply circuit25 Apr 2024US 2024/0136916 A1Power Forest Technology Corporation
Most cited
By later US patents
- Apparatus for monitoring recurrent waveforms73US 3,940,692 AThe University of Edinburgh · 1976
- Dual threshold comparator circuit43US 4,219,152 AInternational Business Machines Corporation · 1980
- Automatic threshold control means and the use thereof38US 4,036,057 AAcoustic Emission Technology Corporation · 1977
- Hearing aid malfunction detection system29US 4,049,930 A1977
- Data limiter for a radio pager26US 4,929,851 AMotorola, Inc. · 1990