H01T 13/58
Testing
Official title: Testing (testing characteristics of the spark in internal-combustion engine ignition F02P17/12)
H01T13/58 (Testing) appears on 114 US grants and 88 published applications in this corpus.
Search patents in H01T- Granted patents
- 114
- Published applications
- 88
- Assignees
- 75
- Inventors
- 213
- Latest grant
- 3 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 2 |
| 2005 | 2 | 2 |
| 2006 | 1 | 1 |
| 2007 | 1 | 2 |
| 2008 | 0 | 1 |
| 2009 | 2 | 5 |
| 2010 | 1 | 1 |
| 2011 | 3 | 0 |
| 2012 | 2 | 3 |
| 2013 | 0 | 3 |
| 2014 | 3 | 7 |
| 2015 | 3 | 5 |
| 2016 | 8 | 4 |
| 2017 | 8 | 13 |
| 2018 | 11 | 15 |
| 2019 | 12 | 7 |
| 2020 | 7 | 4 |
| 2021 | 5 | 6 |
| 2022 | 3 | 3 |
| 2023 | 3 | 0 |
| 2024 | 4 | 2 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Insulator and spark plug3 Jun 2025US 12,322,930 B2Niterra Co., Ltd.
- Measuring a spark of a spark plug15 Oct 2024US 12,116,967 B2Woodward, Inc.
- Method and device for detecting the breakdown voltage between the electrodes of a spark plug connected to an ignition coil for a cylinder ignition system in an internal combustion engine11 Jun 2024US 12,006,905 B2Eldor Corporation S.P.A.
- System and method for spark plug identification and engine monitoring14 May 2024US 11,984,705 B2Ai Alpine US Bidco Inc
- Spark plug heat rating measurement method and system based on spark discharge current active heating5 Mar 2024US 11,923,663 B2Weichai Torch Technology Co., Ltd.
- Spark plug inspection assembly8 Oct 2026US 2026/0312373 A1
- Insulator and spark plug12 Sep 2024US 2024/0305070 A1Niterra Co., Ltd.
- Measuring a spark of a spark plug28 Mar 2024US 2024/0102437 A1Woodward, Inc.
- Voltage Sensing Mechanism3 Nov 2022US 2022/0349372 A1Trillium Worldwide, Inc.
- System and method for spark plug identification and engine monitoring10 Mar 2022US 2022/0077660 A1Ai Alpine US Bidco Inc
Most cited
By later US patents
- Hand-held ignition voltage tester118US 6,396,278 B12002
- Detecting field from different ignition coils using adjustable probe56US 6,940,283 B2Snap-on Incorporated · 2005
- Spark plug tester ignition system29US 4,032,842 AChampion Spark Plug Company · 1977
- Capacitive coupled clamp-on voltage probe23US 4,090,130 AUnited Technologies Corporation · 1978
- Diagnostic device for gas turbine ignition system22US 5,155,437 AUnison Industries Limited Partnership · 1992