G01R 29/20
Measuring number of turns
Official title: Measuring number of turns; Measuring transformation ratio or coupling factor of windings
G01R29/20 (Measuring number of turns) appears on 31 US grants and 26 published applications in this corpus.
Search patents in G01R- Granted patents
- 31
- Published applications
- 26
- Assignees
- 21
- Inventors
- 53
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 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 | 1 | 1 |
| 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 | 3 |
| 2013 | 0 | 1 |
| 2014 | 2 | 1 |
| 2015 | 1 | 3 |
| 2016 | 2 | 0 |
| 2017 | 1 | 2 |
| 2018 | 2 | 4 |
| 2019 | 2 | 2 |
| 2020 | 3 | 1 |
| 2021 | 2 | 1 |
| 2022 | 1 | 3 |
| 2023 | 3 | 1 |
| 2024 | 0 | 2 |
| 2025 | 2 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Transformer turns number testing circuit16 Jun 2026US 12,656,385 B2Sumida Corporation
- Checking apparatus for checking a number of start cycles of a detection device of a motor vehicle, and method27 May 2025US 12,313,662 B2Bayerische Motoren Werke Aktiengesellschaft
- Transformer apparatus4 Feb 2025US 12,217,904 B2Solaredge Technologies Ltd.
- Transformer apparatus24 Oct 2023US 11,798,733 B2Solaredge Technologies Ltd.
- Transformer test system and method12 Sep 2023US 11,754,641 B2AVO Multi-Amp Corporation
- Transformer Apparatus17 Apr 2025US 2025/0125088 A1Solaredge Technologies Ltd.
- Transformer turns number testing circuit19 Dec 2024US 2024/0418760 A1Sumida Corporation
- Transformer Apparatus22 Feb 2024US 2024/0062952 A1Solaredge Technologies Ltd.
- Checking Apparatus for Checking a Number of Start Cycles of a Detection Device of a Motor Vehicle, and Method26 Jan 2023US 2023/0023763 A1Bayerische Motoren Werke Aktiengesellschaft
- Transformer Test System and Method7 Apr 2022US 2022/0107365 A1AVO Multi-Amp Corporation d/b/a Megger
Most cited
By later US patents
- Portable tester and related method for determining the primary winding to secondary winding current ratio of an in-service current transformer28US 4,758,774 ASpecial Instruments Laboratory, Inc. · 1988
- Transformer test control device19US 6,445,196 B12002
- Test fixture having switching means for facilitating transformer turns ratio testing13US 4,241,306 A1980
- Apparatus for and method for testing the number of turns on a coil6US 3,953,791 AH. Tinsley & Co. Ltd. · 1976
- Apparatus for determining the number of turns of a magnetic coil5US 4,439,724 AAnalog Devices, Inc. · 1984