H01T
Spark gaps
Official title: Spark gaps; overvoltage arresters using spark gaps; sparking plugs; corona devices; generating ions to be introduced into non-enclosed gases (overvoltage protection circuits h02h)
H01T (Spark gaps) appears on 5,480 US grants and 3,887 published applications in this corpus.
Search patents in H01T- Granted patents
- 5,480
- Published applications
- 3,887
- Assignees
- 1,462
- Inventors
- 7,153
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 83 | 0 |
| 1977 | 93 | 0 |
| 1978 | 80 | 0 |
| 1979 | 53 | 0 |
| 1980 | 62 | 0 |
| 1981 | 65 | 0 |
| 1982 | 79 | 0 |
| 1983 | 67 | 0 |
| 1984 | 70 | 0 |
| 1985 | 75 | 0 |
| 1986 | 60 | 0 |
| 1987 | 73 | 0 |
| 1988 | 75 | 0 |
| 1989 | 93 | 0 |
| 1990 | 116 | 0 |
| 1991 | 74 | 0 |
| 1992 | 82 | 0 |
| 1993 | 85 | 0 |
| 1994 | 81 | 0 |
| 1995 | 86 | 0 |
| 1996 | 93 | 0 |
| 1997 | 66 | 0 |
| 1998 | 94 | 0 |
| 1999 | 99 | 0 |
| 2000 | 80 | 0 |
| 2001 | 89 | 30 |
| 2002 | 88 | 116 |
| 2003 | 102 | 89 |
| 2004 | 114 | 120 |
| 2005 | 72 | 125 |
| 2006 | 83 | 120 |
| 2007 | 93 | 143 |
| 2008 | 78 | 120 |
| 2009 | 76 | 155 |
| 2010 | 124 | 151 |
| 2011 | 130 | 171 |
| 2012 | 142 | 195 |
| 2013 | 170 | 202 |
| 2014 | 225 | 252 |
| 2015 | 190 | 222 |
| 2016 | 205 | 209 |
| 2017 | 233 | 232 |
| 2018 | 226 | 229 |
| 2019 | 204 | 189 |
| 2020 | 167 | 178 |
| 2021 | 177 | 123 |
| 2022 | 113 | 132 |
| 2023 | 128 | 124 |
| 2024 | 125 | 139 |
| 2025 | 101 | 70 |
| 2026 | 41 | 51 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- H01T 13/00Sparking plugs2,650
- H01T 4/00Overvoltage arresters using spark gaps894
- H01T 21/00Apparatus or processes specially adapted for the manufacture or maintenance of spark850
- H01T 19/00Devices providing for corona discharge801
- H01T 23/00Apparatus for generating ions to be introduced into non-enclosed gases712
- H01T 1/00Details of spark gaps646
- H01T 2/00Spark gaps comprising auxiliary triggering means215
- H01T 15/00Circuits specially adapted for spark gaps140
Recent patents
- System and method for detecting fire event in underground utility tunnels based on acoustics29 Sep 2026US 12,747,980 B2Electronics and Telecommunications Research Institute
- Air conditioning apparatus15 Sep 2026US 12,734,472 B2LG Electronics Inc.
- Tool for removing a seal ring from a spark plug8 Sep 2026US 12,728,506 B2Robert Bosch GmbH
- Ion generator and system with mobile HVAC1 Sep 2026US 12,722,161 B2Dometic Sweden AB
- Spark gaps with high current capability for electrical overstress detection and protection25 Aug 2026US 12,719,242 B2Analog Devices International Unlimited Company
- Spark plug inspection assembly8 Oct 2026US 2026/0312373 A1
- Spark plug24 Sep 2026US 2026/0291185 A1Niterra Co., Ltd.
- Spark plug with tapered breathing space3 Sep 2026US 2026/0261100 A1
- Spark Plug, Spark Plug Sleeve And Spark Plug Assembly For A Gas Engine27 Aug 2026US 2026/0251087 A1Caterpillar Energy Solutions GmbH
- Graded spark gap design for internally gapped surge arrester27 Aug 2026US 2026/0253768 A1
Most cited
By later US patents
- Electrosurgical method and apparatus for initiating an electrical discharge in an inert gas flow317US 4,040,426 AValleylab, Inc. · 1977
- Method and apparatus for the electrostatic charging of a web or film195US 5,401,446 AThe University of Tennessee Research Corporation · 1995
- Module for electrically connecting conductor wires to circuits of flat surfaces such as solar panels165US 5,513,075 AThe Whitaker Corporation · 1996
- Corona discharge apparatus157US 5,317,155 AThe Electrogesic Corporation · 1994
- Passive overvoltage protection devices, especially for protection of computer equipment connected to data lines147US 4,586,104 ARIT Research Corp. · 1986