F23N 2233/08
With variable speed
Official title: with variable speed
F23N2233/08 (With variable speed) appears on 249 US grants and 192 published applications in this corpus.
Search patents in F23N- Granted patents
- 249
- Published applications
- 192
- Assignees
- 154
- Inventors
- 498
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 6 | 0 |
| 1988 | 7 | 0 |
| 1989 | 2 | 0 |
| 1990 | 5 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 12 | 0 |
| 1994 | 10 | 0 |
| 1995 | 6 | 0 |
| 1996 | 5 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 10 | 0 |
| 2000 | 9 | 0 |
| 2001 | 5 | 3 |
| 2002 | 4 | 3 |
| 2003 | 8 | 8 |
| 2004 | 4 | 8 |
| 2005 | 8 | 9 |
| 2006 | 5 | 7 |
| 2007 | 7 | 5 |
| 2008 | 0 | 4 |
| 2009 | 1 | 8 |
| 2010 | 3 | 8 |
| 2011 | 6 | 9 |
| 2012 | 4 | 8 |
| 2013 | 4 | 10 |
| 2014 | 6 | 8 |
| 2015 | 6 | 5 |
| 2016 | 12 | 6 |
| 2017 | 7 | 6 |
| 2018 | 8 | 7 |
| 2019 | 7 | 4 |
| 2020 | 5 | 8 |
| 2021 | 4 | 5 |
| 2022 | 5 | 14 |
| 2023 | 10 | 13 |
| 2024 | 7 | 10 |
| 2025 | 10 | 11 |
| 2026 | 5 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for automated furnace inducer sensor output verification22 Sep 2026US 12,742,548 B2Rheem Manufacturing Company
- Push/pull furnace and methods related thereto14 Jul 2026US 12,680,693 B2Trane International Inc.
- Method and controller for operating a gas burner appliance19 May 2026US 12,631,331 B2Pittway Sarl
- Power output determination by way of a fuel parameter3 Mar 2026US 12,565,994 B2Siemens Aktiengesellschaft
- Control and/or regulation of a combustion apparatus6 Jan 2026US 12,516,812 B2Siemens Aktiengesellschaft
- Device and method for controlling a comburent-fuel mixture in a premixed gas burner17 Sep 2026US 2026/0276195 A1Bertelli & Partners S.R.L.
- Method for starting the combustion operation of a fuel-powered vehicle heater25 Jun 2026US 2026/0175646 A1Eberspächer Climate Control Systems GmbH & Co. KG
- Method of controlling inverter for blower of industrial boiler based on iot and industrial boiler using the same21 May 2026US 2026/0139827 A1DAELIM ROYAL EnP CO., LTD.
- Systems and Methods for Measuring Throttle Position19 Mar 2026US 2026/0078839 A1Pittway Sarl
- Air supply systems for combustion of granular biomass fuels15 Jan 2026US 2026/0016165 A1Aprovecho Research Center
Most cited
By later US patents
- Integrated appliance control system186US 6,059,195 ATridelta Industries, Inc. · 2000
- Apparatus for modulating the flow of air and fuel to a gas burner90US 5,520,533 AHoneywell Inc. · 1996
- Method for providing variable output gas-fired furnace with a constant temperature rise and efficiency88US 4,688,547 ACarrier Corporation · 1987
- Modulating gas valve furnace control method82US 5,860,411 ACarrier Corporation · 1999
- Flame ionization control apparatus and method78US 5,971,745 AGas Research Institute · 1999