F23Q 7/001
Glowing plugs for internal-combustion engines
Official title: {Glowing plugs for internal-combustion engines}
F23Q7/001 (Glowing plugs for internal-combustion engines) appears on 487 US grants and 345 published applications in this corpus.
Search patents in F23Q- Granted patents
- 487
- Published applications
- 345
- Assignees
- 124
- Inventors
- 707
- Latest grant
- 14 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 5 | 0 |
| 1982 | 8 | 0 |
| 1983 | 7 | 0 |
| 1984 | 12 | 0 |
| 1985 | 8 | 0 |
| 1986 | 14 | 0 |
| 1987 | 12 | 0 |
| 1988 | 11 | 0 |
| 1989 | 14 | 0 |
| 1990 | 7 | 0 |
| 1991 | 7 | 0 |
| 1992 | 10 | 0 |
| 1993 | 8 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 10 | 0 |
| 1999 | 11 | 0 |
| 2000 | 21 | 0 |
| 2001 | 15 | 8 |
| 2002 | 16 | 30 |
| 2003 | 24 | 13 |
| 2004 | 20 | 19 |
| 2005 | 14 | 14 |
| 2006 | 10 | 11 |
| 2007 | 17 | 22 |
| 2008 | 10 | 11 |
| 2009 | 7 | 23 |
| 2010 | 12 | 19 |
| 2011 | 7 | 22 |
| 2012 | 11 | 8 |
| 2013 | 16 | 26 |
| 2014 | 7 | 23 |
| 2015 | 9 | 28 |
| 2016 | 20 | 12 |
| 2017 | 29 | 13 |
| 2018 | 14 | 9 |
| 2019 | 10 | 5 |
| 2020 | 6 | 8 |
| 2021 | 3 | 4 |
| 2022 | 7 | 4 |
| 2023 | 4 | 4 |
| 2024 | 7 | 4 |
| 2025 | 1 | 1 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- High voltage ceramic electric heating element14 Apr 2026US 12,604,370 B2Chongqing Le-Mark Ceramic Technology Co Limited
- Heater14 Apr 2026US 12,604,371 B2KYOCERA Corporation
- Compression ignition engine with igniter and pilot injector28 Jan 2025US 12,209,532 B2Wisconsin Alumni Research Foundation
- In situ valuation of auto-ignition quality of fuel in compression ignition engines26 Nov 2024US 12,152,544 B2Wayne State University
- Heater and glow-plug provided therewith26 Nov 2024US 12,152,776 B2KYOCERA Corporation
- Temperature measurement system and method for temperature control of hot surface igniter30 Jul 2026US 2026/0219696 A1Chongqing Le-Mark Technology Co
- Ignitor canister for a turbine glow plug18 Jun 2026US 2026/0168443 A1
- Temperature control system for hot surface igniter21 May 2026US 2026/0139835 A1Chongqing Le-Mark Technology Co
- Hot surface igniter temperature control system and method26 Mar 2026US 2026/0086587 A1Chongqing Le-Mark Technology Co
- Glow plug with an exposed filament and an insert and mounting arrangement including the same20 Feb 2025US 2025/0060102 A1Robert Bosch Limitada
Most cited
By later US patents
- Catalytic-compression timed ignition77US 5,109,817 AAltronic, Inc. · 1992
- Sheathed heater75US 4,639,712 ANippondenso Co., Ltd. · 1987
- Ceramic heater73US 4,475,029 ANippondenso Co., Ltd. · 1984
- Ceramic heater63US 4,357,526 AKyoto Ceramic Co., Ltd. · 1982
- Sintered ceramic heater element62US 4,634,837 ANippon Soken, Inc. · 1987