H01F 38/32
Circuit arrangements
H01F38/32 (Circuit arrangements) appears on 77 US grants and 75 published applications in this corpus.
Search patents in H01F- Granted patents
- 77
- Published applications
- 75
- Assignees
- 64
- Inventors
- 155
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 2 |
| 2004 | 1 | 0 |
| 2005 | 1 | 1 |
| 2006 | 2 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 3 |
| 2010 | 1 | 6 |
| 2011 | 1 | 1 |
| 2012 | 1 | 4 |
| 2013 | 1 | 3 |
| 2014 | 2 | 3 |
| 2015 | 5 | 3 |
| 2016 | 1 | 3 |
| 2017 | 4 | 6 |
| 2018 | 3 | 5 |
| 2019 | 5 | 4 |
| 2020 | 5 | 10 |
| 2021 | 5 | 7 |
| 2022 | 5 | 5 |
| 2023 | 6 | 3 |
| 2024 | 5 | 0 |
| 2025 | 4 | 3 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Current transformer polarity verification15 Sep 2026US 12,738,416 B2Google Inc.
- Switch current sensors10 Mar 2026US 12,573,550 B2The University of North Carolina at Charlotte
- Universal AC/DC current sensor and isolator2 Dec 2025US 12,488,939 B2Georgia Tech Research Corporation
- Smart grid sensor with power harvesting from low line currents28 Oct 2025US 12,455,304 B2Megger Grid Analytics Ltd
- Current transformer with current branches on primary conductor29 Jul 2025US 12,374,487 B2
- Current transformer polarity verification24 Sep 2026US 2026/0290685 A1Google Inc.
- Current transformer polarity verification16 Oct 2025US 2025/0322988 A1Google Inc.
- Universal ac/dc current sensor and isolator24 Apr 2025US 2025/0132089 A1Georgia Tech Research Corporation
- Switch current sensors3 Apr 2025US 2025/0111992 A1The University of North Carolina at Charlotte
- Smart grid sensor with power harvesting from low line currents21 Dec 2023US 2023/0408561 A1Megger Grid Analytics Ltd
Most cited
By later US patents
- Arrangement for measuring electrical power89US 4,742,296 ALGZ Landis & Gyr Zug AG · 1988
- Method and apparatus for magnetizing and demagnetizing current transformers and magnetic bodies79US 6,160,697 A2000
- Current transformer for measuring instruments46US 4,513,274 ALGZ Landis & Gyr Zug AG · 1985
- Method and apparatus for controlling the magnetization of current transformers and other magnetic bodies45US 6,522,517 B12003
- Method and apparatus for accurate measurement of pulsed electric currents utilizing ordinary current transformers29US 6,479,976 B12002