F23N 2235/16
Variable flow or proportional valves
Official title: variable flow or proportional valves
F23N2235/16 (Variable flow or proportional valves) appears on 310 US grants and 252 published applications in this corpus.
Search patents in F23N- Granted patents
- 310
- Published applications
- 252
- Assignees
- 191
- Inventors
- 674
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 7 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 7 | 0 |
| 1994 | 7 | 0 |
| 1995 | 11 | 0 |
| 1996 | 8 | 0 |
| 1997 | 6 | 0 |
| 1998 | 11 | 0 |
| 1999 | 20 | 0 |
| 2000 | 6 | 0 |
| 2001 | 10 | 4 |
| 2002 | 5 | 7 |
| 2003 | 11 | 4 |
| 2004 | 4 | 5 |
| 2005 | 5 | 10 |
| 2006 | 8 | 8 |
| 2007 | 6 | 12 |
| 2008 | 3 | 8 |
| 2009 | 2 | 6 |
| 2010 | 8 | 11 |
| 2011 | 4 | 6 |
| 2012 | 10 | 10 |
| 2013 | 4 | 12 |
| 2014 | 9 | 13 |
| 2015 | 8 | 8 |
| 2016 | 9 | 9 |
| 2017 | 8 | 11 |
| 2018 | 6 | 4 |
| 2019 | 10 | 9 |
| 2020 | 7 | 8 |
| 2021 | 8 | 8 |
| 2022 | 9 | 20 |
| 2023 | 10 | 16 |
| 2024 | 12 | 18 |
| 2025 | 11 | 10 |
| 2026 | 9 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for controlling a variable gas valve15 Sep 2026US 12,736,230 B2Copeland Comfort Control LP
- Flow modulator for a fluid11 Aug 2026US 12,704,187 B2Pittway Sarl
- Quick heat algorithm for modulating heating equipment14 Jul 2026US 12,680,719 B2Johnson Controls Light Commercial IP GmbH
- Hydronic surface heater with auto-adjusting burner7 Jul 2026US 12,674,578 B2Wacker Neuson America Corporation
- Gas valve and gas stove16 Jun 2026US 12,655,985 B2BSH Hausgeräte GmbH
- Device and method for controlling a comburent-fuel mixture in a premixed gas burner17 Sep 2026US 2026/0276195 A1Bertelli & Partners S.R.L.
- Device for producing a hydrogen - gaseous hydrocarbon mixture3 Sep 2026US 2026/0258948 A1Suntec Industries France
- Method of heating a steel semi-product in a heating furnace, and associated heating furnace3 Sep 2026US 2026/0259005 A1
- Venturi for boiler2 Jul 2026US 2026/0185704 A1Kyungdong Navien Co., Ltd.
- Premixer and gas device2 Jul 2026US 2026/0185708 A1Guangdong Midea Kitchen and Bath Appliances Mfg. Co., Ltd.
Most cited
By later US patents
- Modulating furnace with two-speed draft inducer138US 5,732,691 ARheem Manufacturing Company · 1998
- Variable heat generating method and apparatus129US 4,622,007 AAmerican Combustion, Inc. · 1986
- Two-stage gas valve with natural/LP gas conversion capability90US 5,413,141 AHoneywell Inc. · 1995
- Flame ionization control apparatus and method78US 5,971,745 AGas Research Institute · 1999
- Intelligent burner control system69US 6,247,919 B1Maxon Corporation · 2001