H01T 13/38
Selection of materials for insulation
H01T13/38 (Selection of materials for insulation) appears on 171 US grants and 158 published applications in this corpus.
Search patents in H01T- Granted patents
- 171
- Published applications
- 158
- Assignees
- 43
- Inventors
- 279
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 4 | 1 |
| 2002 | 2 | 8 |
| 2003 | 6 | 3 |
| 2004 | 7 | 2 |
| 2005 | 1 | 8 |
| 2006 | 3 | 4 |
| 2007 | 4 | 7 |
| 2008 | 4 | 7 |
| 2009 | 1 | 6 |
| 2010 | 5 | 7 |
| 2011 | 7 | 8 |
| 2012 | 10 | 12 |
| 2013 | 7 | 4 |
| 2014 | 5 | 5 |
| 2015 | 6 | 6 |
| 2016 | 9 | 9 |
| 2017 | 10 | 11 |
| 2018 | 7 | 17 |
| 2019 | 12 | 8 |
| 2020 | 10 | 6 |
| 2021 | 4 | 4 |
| 2022 | 5 | 3 |
| 2023 | 6 | 4 |
| 2024 | 7 | 6 |
| 2025 | 4 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Spark plug with electrode head shielding element5 Aug 2025US 12,381,374 B2EcoPower Spark, LLC
- Insulator and spark plug3 Jun 2025US 12,322,930 B2Niterra Co., Ltd.
- Spark plug insulator and spark plug11 Mar 2025US 12,249,809 B2Niterra Co., Ltd.
- Spark plug18 Feb 2025US 12,230,941 B2Niterra Co., Ltd.
- Spark plug17 Sep 2024US 12,095,234 B2Niterra Co., Ltd.
- Spark plug resistor element arrangement, method for producing same, and spark plug for an internal combustion engine27 Aug 2026US 2026/0254205 A1
- Spark plug2 Jan 2025US 2025/0007249 A1Niterra Co., Ltd.
- Spark plug with electrode head shielding element5 Dec 2024US 2024/0405520 A1EcoPower Spark, LLC
- Spark plug insulator and spark plug3 Oct 2024US 2024/0332918 A1Niterra Co., Ltd.
- Insulator and spark plug12 Sep 2024US 2024/0305070 A1Niterra Co., Ltd.
Most cited
By later US patents
- Spark plug insulator for use in internal combustion engine62US 5,508,582 ANgk Spark Plug Co., Ltd. · 1996
- Method of making a spark plug insulator58US 5,565,157 ANgk Spark Plug Co., Ltd. · 1996
- Process for the preparation of a sintered ceramic spark plug31US 8,003,020 B2Meggitt (France) · 2011
- Spark plug, alumina insulator for spark plug, and method of manufacturing the same23US 6,407,487 B1Ngk Spark Plug Co., Ltd. · 2002
- Method of making an ignition plug insulator having an electrically conductive end22US 4,261,085 ANgk Spark Plug Co., Ltd. · 1981