G01R 35/02
Testing or calibrating of apparatus covered by the other groups of this
Official title: of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
G01R35/02 (Testing or calibrating of apparatus covered by the other groups of this) appears on 99 US grants and 96 published applications in this corpus.
Search patents in G01R- Granted patents
- 99
- Published applications
- 96
- Assignees
- 96
- Inventors
- 350
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 3 |
| 2003 | 3 | 1 |
| 2004 | 2 | 1 |
| 2005 | 1 | 2 |
| 2006 | 3 | 0 |
| 2007 | 2 | 4 |
| 2008 | 1 | 1 |
| 2009 | 0 | 2 |
| 2010 | 0 | 2 |
| 2011 | 0 | 2 |
| 2012 | 1 | 3 |
| 2013 | 4 | 3 |
| 2014 | 1 | 3 |
| 2015 | 1 | 8 |
| 2016 | 6 | 2 |
| 2017 | 3 | 3 |
| 2018 | 5 | 4 |
| 2019 | 2 | 5 |
| 2020 | 4 | 9 |
| 2021 | 7 | 4 |
| 2022 | 7 | 6 |
| 2023 | 6 | 9 |
| 2024 | 6 | 3 |
| 2025 | 4 | 9 |
| 2026 | 5 | 7 |
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.
- Storage battery control apparatus12 May 2026US 12,623,546 B2Denso Corporation
- Methods, systems and devices for monitoring power consumption and generation17 Feb 2026US 12,553,927 B2Powersensor Pty Ltd
- Measuring dissipation factor of voltage divider of capacitor voltage transformers27 Jan 2026US 12,535,506 B2Electronic Sazan Fan Aria Company
- Digital-analog integrated voltage transformer calibration system13 Jan 2026US 12,524,029 B2
- Current transformer polarity verification24 Sep 2026US 2026/0290685 A1Google Inc.
- Methods for configuring a receptor apparatus and apparatuses for implementing the same13 Aug 2026US 2026/0235712 A1Schneider Electric Industries SAS
- Non-Contact Voltage Tester4 Jun 2026US 2026/0153585 A1Robert Bosch GmbH
- Magnetic wrap up effects screening2 Apr 2026US 2026/0092954 A1Schneider Electric USA, Inc.
- Mitigation of differential current transformer cross-talk2 Apr 2026US 2026/0094760 A1Schneider Electric USA, Inc.
Most cited
By later US patents
- Apparatus for testing interconnects for semiconductor dice68US 5,742,169 AMicron Technology, Inc. · 1998
- Apparatus and method for compensating secondary currents used in differential protection to correct for a phase shift introduced between high voltage and low voltage transformer windings32US 7,425,778 B2Schweitzer Engineering Laboratories, Inc. · 2008
- Precision voltage/current/power source30US 5,642,300 ARotek Instrument Corp. · 1997
- IC testing device for permitting adjustment of timing of a test signal29US 5,225,775 AAdvantest Corporation · 1993
- 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