F23N 2235/18
Groups of two or more valves
F23N2235/18 (Groups of two or more valves) appears on 297 US grants and 185 published applications in this corpus.
Search patents in F23N- Granted patents
- 297
- Published applications
- 185
- Assignees
- 130
- Inventors
- 430
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 5 | 0 |
| 1978 | 7 | 0 |
| 1979 | 4 | 0 |
| 1980 | 4 | 0 |
| 1981 | 5 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 12 | 0 |
| 1985 | 6 | 0 |
| 1986 | 8 | 0 |
| 1987 | 4 | 0 |
| 1988 | 11 | 0 |
| 1989 | 6 | 0 |
| 1990 | 11 | 0 |
| 1991 | 7 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 7 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 7 | 0 |
| 2000 | 6 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 3 |
| 2003 | 3 | 5 |
| 2004 | 4 | 8 |
| 2005 | 2 | 4 |
| 2006 | 7 | 8 |
| 2007 | 1 | 4 |
| 2008 | 2 | 9 |
| 2009 | 3 | 4 |
| 2010 | 5 | 17 |
| 2011 | 2 | 3 |
| 2012 | 9 | 7 |
| 2013 | 6 | 19 |
| 2014 | 12 | 6 |
| 2015 | 11 | 14 |
| 2016 | 6 | 8 |
| 2017 | 17 | 14 |
| 2018 | 8 | 3 |
| 2019 | 7 | 6 |
| 2020 | 9 | 5 |
| 2021 | 6 | 11 |
| 2022 | 5 | 11 |
| 2023 | 11 | 7 |
| 2024 | 7 | 3 |
| 2025 | 3 | 4 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for fuel selection for combustion devices7 Jul 2026US 12,674,577 B2Rheem Manufacturing Company
- Systems and processes of eliminating start-up flaring in a gas plant17 Mar 2026US 12,578,740 B2Saudi Arabian Oil Company
- Control and/or regulation of a combustion apparatus6 Jan 2026US 12,516,812 B2Siemens Aktiengesellschaft
- Method for evaluating a quasi-stationary pressure difference detectable by a sensor at a gas boiler, and associated gas boiler28 Oct 2025US 12,455,076 B2ebm-papst Landshut GmbH
- Hydrate-inhibiting chemical injector and related methods8 Apr 2025US 12,269,989 B2
- Plant and method for operating plant27 Aug 2026US 2026/0251301 A1Mitsubishi Heavy Industries, Ltd.
- One-piece combination valve, fuel system and temperature regulating control method thereof29 Jan 2026US 2026/0029059 A1Chant Heat Energy Science & Technology (Zhongshan) Co., LTD.
- Gas grills including bus bars16 Oct 2025US 2025/0318683 A1Weber-Stephen Products LLC
- Furnace31 Jul 2025US 2025/0244050 A1Dometic Sweden AB
- Systems and processes of eliminating start-up flaring in a gas plant6 Feb 2025US 2025/0044815 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Burner ignition system132US 4,717,333 AAdvanced Mechanical Technology, Inc. · 1988
- Cordless hydrocarbon fuel heated hairdryer78US 5,857,262 AThe Schawbel Corporation · 1999
- Thermally amplified and stimulated emission radiator fiber matrix burner66US 5,356,487 AThe Quantum Group, Inc. · 1994
- Furnace control using induced draft blower and exhaust stack flow rate sensing65US 4,251,025 AHoneywell Inc. · 1981
- Self-powered intermittent ignition and control system for gas combustion appliances65US 4,778,378 AThe Quantum Group, Inc. · 1988