F23N 2235/06
At the air intake
Official title: at the air intake
F23N2235/06 (At the air intake) appears on 247 US grants and 113 published applications in this corpus.
Search patents in F23N- Granted patents
- 247
- Published applications
- 113
- Assignees
- 177
- Inventors
- 482
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 4 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 7 | 0 |
| 1981 | 13 | 0 |
| 1982 | 4 | 0 |
| 1983 | 10 | 0 |
| 1984 | 11 | 0 |
| 1985 | 11 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 6 | 0 |
| 1989 | 9 | 0 |
| 1990 | 7 | 0 |
| 1991 | 12 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 5 | 0 |
| 1998 | 4 | 0 |
| 1999 | 11 | 0 |
| 2000 | 4 | 0 |
| 2001 | 9 | 3 |
| 2002 | 2 | 2 |
| 2003 | 4 | 4 |
| 2004 | 4 | 5 |
| 2005 | 1 | 0 |
| 2006 | 3 | 4 |
| 2007 | 4 | 4 |
| 2008 | 1 | 3 |
| 2009 | 0 | 6 |
| 2010 | 0 | 3 |
| 2011 | 3 | 6 |
| 2012 | 2 | 9 |
| 2013 | 3 | 5 |
| 2014 | 4 | 9 |
| 2015 | 6 | 5 |
| 2016 | 6 | 0 |
| 2017 | 7 | 5 |
| 2018 | 0 | 0 |
| 2019 | 3 | 2 |
| 2020 | 2 | 5 |
| 2021 | 2 | 4 |
| 2022 | 4 | 7 |
| 2023 | 2 | 6 |
| 2024 | 3 | 6 |
| 2025 | 6 | 4 |
| 2026 | 5 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hydronic surface heater with auto-adjusting burner7 Jul 2026US 12,674,578 B2Wacker Neuson America Corporation
- Electronic control device and flow rate measurement system17 Mar 2026US 12,578,091 B2Hitachi Astemo, Ltd.
- Power output determination by way of a fuel parameter3 Mar 2026US 12,565,994 B2Siemens Aktiengesellschaft
- Premixing apparatus3 Mar 2026US 12,565,997 B2Rinnai Corporation
- Variable orifice restriction device13 Jan 2026US 12,523,374 B2The Marley Company
- Manual air control device for gas burner6 Aug 2026US 2026/0227065 A1SNT Co., Ltd.
- Venturi for boiler2 Jul 2026US 2026/0185704 A1Kyungdong Navien Co., Ltd.
- Premixer and gas device2 Jul 2026US 2026/0185709 A1Guangdong Midea Kitchen and Bath Appliances Mfg. Co., Ltd.
- 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.
- Variable orifice restriction device30 Apr 2026US 2026/0117972 A1The Marley Company
Most cited
By later US patents
- Non-recovery coke oven gas combustion system135US 5,968,320 AStelco Inc. · 1999
- System and process for controlling the flow of air and fuel to a burner92US 4,645,450 AControl Techtronics, Inc. · 1987
- Combustion air regulating apparatus for use with induced draft furnaces90US 5,993,195 ACarrier Corporation · 1999
- Method and apparatus for optical flame control of combustion burners80US 6,045,353 AAmerican Air Liquide, Inc. · 2000
- Method and apparatus for optical flame control of combustion burners76US 5,829,962 AAmerican Air Liquide, Inc. · 1998