H01T 13/20
Sparking plugs: characterised by features of the electrodes or insulation
Official title: characterised by features of the electrodes or insulation
H01T13/20 (Sparking plugs: characterised by features of the electrodes or insulation) appears on 1,549 US grants and 1,365 published applications in this corpus.
Search patents in H01T- Granted patents
- 1,549
- Published applications
- 1,365
- Assignees
- 222
- Inventors
- 1,476
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 4 | 0 |
| 1978 | 10 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 7 | 0 |
| 1982 | 6 | 0 |
| 1983 | 7 | 0 |
| 1984 | 10 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 11 | 0 |
| 1988 | 5 | 0 |
| 1989 | 11 | 0 |
| 1990 | 17 | 0 |
| 1991 | 6 | 0 |
| 1992 | 14 | 0 |
| 1993 | 9 | 0 |
| 1994 | 8 | 0 |
| 1995 | 15 | 0 |
| 1996 | 23 | 0 |
| 1997 | 6 | 0 |
| 1998 | 13 | 0 |
| 1999 | 23 | 0 |
| 2000 | 22 | 0 |
| 2001 | 25 | 13 |
| 2002 | 22 | 46 |
| 2003 | 39 | 30 |
| 2004 | 42 | 29 |
| 2005 | 22 | 55 |
| 2006 | 29 | 43 |
| 2007 | 31 | 52 |
| 2008 | 23 | 40 |
| 2009 | 27 | 49 |
| 2010 | 45 | 57 |
| 2011 | 46 | 64 |
| 2012 | 71 | 79 |
| 2013 | 71 | 90 |
| 2014 | 93 | 97 |
| 2015 | 89 | 73 |
| 2016 | 85 | 62 |
| 2017 | 82 | 93 |
| 2018 | 94 | 76 |
| 2019 | 71 | 67 |
| 2020 | 75 | 63 |
| 2021 | 58 | 38 |
| 2022 | 33 | 35 |
| 2023 | 48 | 44 |
| 2024 | 45 | 39 |
| 2025 | 25 | 16 |
| 2026 | 5 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01T 13/39Selection of materials for electrodes648
- H01T 13/32Characterised by features of the earthed electrode585
- H01T 13/34Characterised by the mounting of electrodes in insulation177
- H01T 13/38Selection of materials for insulation171
- H01T 13/36Characterised by the joint between insulation and body159
- H01T 13/22Having two or more electrodes embedded in insulation34
- H01T 13/24Having movable electrodes32
- H01T 13/28Having spherically shaped electrodes13
Recent patents
- Spark plug with ground electrode in a recess on housing end side30 Jun 2026US 12,671,233 B2Robert Bosch GmbH
- Spark plug having a small inter-electrode distance and an at least partly negative spark position9 Jun 2026US 12,651,891 B2Robert Bosch GmbH
- Ignition system and igniter having ruthenium ground electrode and platinum-iridium alloy center electrode12 May 2026US 12,627,118 B2Champion Aerospace Inc.
- Spark plug with a sealing earth electrode21 Apr 2026US 12,609,512 B2Robert Bosch GmbH
- Spark plug electrode having thermally resilient joint and method of manufacturing the same10 Feb 2026US 12,548,984 B2Federal-Mogul Ignition Company
- Spark plug24 Sep 2026US 2026/0291185 A1Niterra Co., Ltd.
- Spark plug with tapered breathing space3 Sep 2026US 2026/0261100 A1
- Spark plug with improved ground electrode27 Aug 2026US 2026/0254204 A1
- Spark plug resistor element arrangement, method for producing same, and spark plug for an internal combustion engine27 Aug 2026US 2026/0254205 A1
- Prechamber Ignition Means for an Internal Combustion Engine and Engine Having Same20 Aug 2026US 2026/0243191 A1Bayerische Motoren Werke Aktiengesellschaft
Most cited
By later US patents
- Spark plug110US 6,495,948 B1Pyrotek Enterprises, Inc. · 2002
- Spark plug with measuring means78US 4,489,596 ARobert Bosch GmbH · 1984
- Spark plug69US 3,958,144 A1976
- Rapid heat-dissipating type spark plug for internal combustion engines67US 5,017,826 ANgk Spark Plug Co., Ltd. · 1991
- Combined fuel injection valve-ignition plug65US 7,077,100 B2Robert Bosch GmbH · 2006