G01R 15/22
Using light-emitting devices
Official title: using light-emitting devices, e.g. LED, optocouplers {(G01R31/31901 takes precedence)}
G01R15/22 (Using light-emitting devices) appears on 124 US grants and 97 published applications in this corpus.
Search patents in G01R- Granted patents
- 124
- Published applications
- 97
- Assignees
- 119
- Inventors
- 288
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 2 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 3 |
| 2008 | 2 | 2 |
| 2009 | 1 | 6 |
| 2010 | 2 | 3 |
| 2011 | 4 | 4 |
| 2012 | 2 | 2 |
| 2013 | 2 | 3 |
| 2014 | 6 | 5 |
| 2015 | 3 | 4 |
| 2016 | 6 | 3 |
| 2017 | 1 | 3 |
| 2018 | 2 | 7 |
| 2019 | 9 | 6 |
| 2020 | 3 | 4 |
| 2021 | 5 | 3 |
| 2022 | 2 | 9 |
| 2023 | 9 | 8 |
| 2024 | 5 | 10 |
| 2025 | 4 | 4 |
| 2026 | 6 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electromagnetically induced grating-based electric field detection system and method18 Aug 2026US 12,710,460 B2Korea Research Institute of Standards and Science
- CMOS integration of a high bandwidth optically isolated current sensor21 Jul 2026US 12,689,283 B2STMicroelectronics International N. V.
- Optical step-up transformer14 Jul 2026US 12,681,051 B2Lumileds Singapore Pte. Ltd.
- Sensor with a light guide connection7 Jul 2026US 12,674,824 B2
- Wideband measurement system for mixed-connected capacitive voltage transformer based on optical voltage sensor27 Jan 2026US 12,535,509 B2Harbin Institute of Technology
- Measurement system1 Oct 2026US 2026/0298986 A1Seikoh Giken Co., Ltd.
- Non-instrusive passive wireless self-energizing quantum current sensor16 Jul 2026US 2026/0202446 A1Southern Power Grid Sensing Technology (Guangdong) Co., Ltd.
- Sensing device4 Jun 2026US 2026/0153538 A1Life Safety Distribution AG
- Measuring an Electrical Current Using Two Optical Current Transformers28 May 2026US 2026/0147022 A1HSP Hochspannungsgeräte GmbH
- Cmos integration of a high bandwidth optically isolated current sensor5 Feb 2026US 2026/0039179 A1STMicroelectronics International N. V.
Most cited
By later US patents
- Fault detector227US 4,881,028 A1989
- Current measuring apparatus159US 4,630,218 ACooper Industries, Inc. · 1986
- Optical isolation amplifier with sigma-delta modulation81US 5,287,107 AHewlett-Packard Company · 1994
- Linear signal isolator and calibration circuit for electronic current transformer78US 4,070,572 AGeneral Electric Company · 1978
- Energization indicator and method for heat trace cable and the like61US 4,650,971 APGM, Inc. · 1987