H01T 13/39
Selection of materials for electrodes
H01T13/39 (Selection of materials for electrodes) appears on 648 US grants and 557 published applications in this corpus.
Search patents in H01T- Granted patents
- 648
- Published applications
- 557
- Assignees
- 102
- Inventors
- 643
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 5 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 7 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 6 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 8 | 0 |
| 1991 | 1 | 0 |
| 1992 | 5 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 11 | 0 |
| 1996 | 16 | 0 |
| 1997 | 1 | 0 |
| 1998 | 8 | 0 |
| 1999 | 12 | 0 |
| 2000 | 13 | 0 |
| 2001 | 11 | 7 |
| 2002 | 6 | 24 |
| 2003 | 19 | 17 |
| 2004 | 21 | 20 |
| 2005 | 13 | 26 |
| 2006 | 14 | 19 |
| 2007 | 16 | 31 |
| 2008 | 11 | 12 |
| 2009 | 18 | 24 |
| 2010 | 22 | 24 |
| 2011 | 16 | 25 |
| 2012 | 29 | 31 |
| 2013 | 38 | 34 |
| 2014 | 36 | 40 |
| 2015 | 36 | 22 |
| 2016 | 24 | 14 |
| 2017 | 29 | 37 |
| 2018 | 34 | 24 |
| 2019 | 25 | 29 |
| 2020 | 30 | 19 |
| 2021 | 13 | 10 |
| 2022 | 11 | 15 |
| 2023 | 18 | 21 |
| 2024 | 22 | 17 |
| 2025 | 10 | 11 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Ignition system and igniter having ruthenium ground electrode and platinum-iridium alloy center electrode12 May 2026US 12,627,118 B2Champion Aerospace Inc.
- Spark plug electrode having thermally resilient joint and method of manufacturing the same10 Feb 2026US 12,548,984 B2Federal-Mogul Ignition Company
- Spark plug2 Sep 2025US 12,407,148 B2Niterra Co., Ltd.
- Spark plug with electrode head shielding element5 Aug 2025US 12,381,374 B2EcoPower Spark, LLC
- Spark plug electrode having ruthenium-based material5 Aug 2025US 12,381,375 B1Federal-Mogul Ignition Company
Most cited
By later US patents
- 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
- Spark plug center electrode of alloy material including aluminum and chromium64US 4,742,265 AFord Motor Company · 1988
- Spark plug and its electrode configuration57US 4,700,103 ANgk Spark Plug Co., Ltd. · 1987
- Spark plug for internal combustion engine50US 6,094,000 ANippondenso Co., Ltd. · 2000