H02H 9/008
Intrinsically safe circuits
Official title: {Intrinsically safe circuits}
H02H9/008 (Intrinsically safe circuits) appears on 205 US grants and 181 published applications in this corpus.
Search patents in H02H- Granted patents
- 205
- Published applications
- 181
- Assignees
- 135
- Inventors
- 395
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 4 | 3 |
| 2003 | 2 | 5 |
| 2004 | 4 | 6 |
| 2005 | 2 | 5 |
| 2006 | 6 | 9 |
| 2007 | 6 | 7 |
| 2008 | 2 | 7 |
| 2009 | 2 | 4 |
| 2010 | 7 | 4 |
| 2011 | 5 | 4 |
| 2012 | 7 | 5 |
| 2013 | 4 | 5 |
| 2014 | 5 | 4 |
| 2015 | 5 | 9 |
| 2016 | 3 | 12 |
| 2017 | 14 | 8 |
| 2018 | 6 | 6 |
| 2019 | 11 | 20 |
| 2020 | 11 | 10 |
| 2021 | 11 | 11 |
| 2022 | 12 | 6 |
| 2023 | 10 | 12 |
| 2024 | 10 | 9 |
| 2025 | 11 | 7 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Protection circuit and charging equipment30 Jun 2026US 12,671,258 B2Omron Healthcare Co., Ltd.
- Crowbar circuit, in particular for a voltage transformer, in explosion-protected applications12 May 2026US 12,627,137 B2Pepperl + Fuchs GmbH
- Field device current limiting31 Mar 2026US 12,592,559 B2Rosemount Inc.
- Intrinsically safe automation field device23 Dec 2025US 12,504,732 B2Endress + Hauser GmbH + Co. KG
- Circuit for inductive power and data transmission with feedback protection2 Dec 2025US 12,489,289 B2Endress+Hauser Conducta GmbH+Co. KG
- Voltage-limiting circuit and field device comprising such a voltage-limiting circuit6 Aug 2026US 2026/0229884 A1Endress+Hauser Wetzer GmbH+Co.KG
- Stop system for a high power system21 May 2026US 2026/0138459 A1AB Volvo Penta
- Supply device for supplying power to a load module12 Feb 2026US 2026/0045786 A1Dräger Safety AG & Co. KGaA
- Connection circuit for a field device, and field device25 Dec 2025US 2025/0390078 A1Endress + Hauser Flowtec AG
- Adapter for an automation field device11 Sep 2025US 2025/0286334 A1Endress + Hauser GmbH + Co. KG
Most cited
By later US patents
- Endoscope apparatus70US 8,194,380 B2Olympus Corporation · 2012
- Barrier device50US 5,710,552 ARosemount Inc. · 1998
- Power supply for an intrinsically safe circuit41US 4,438,473 AThe United States of America as represented by the Secretary of the Interior · 1984
- Intrinsically safe barrier device41US 5,144,517 APepperl + Fuchs GmbH · 1992
- Integrated intrinsically safe input-output module33US 6,397,322 B1Schneider Automation Inc. · 2002