F23N 2235/20
Membrane valves
F23N2235/20 (Membrane valves) appears on 162 US grants and 67 published applications in this corpus.
Search patents in F23N- Granted patents
- 162
- Published applications
- 67
- Assignees
- 73
- Inventors
- 223
- Latest grant
- 1 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 9 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 6 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 7 | 0 |
| 1985 | 3 | 0 |
| 1986 | 7 | 0 |
| 1987 | 3 | 0 |
| 1988 | 6 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 10 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 4 |
| 2002 | 2 | 0 |
| 2003 | 2 | 2 |
| 2004 | 4 | 6 |
| 2005 | 3 | 2 |
| 2006 | 1 | 3 |
| 2007 | 2 | 1 |
| 2008 | 0 | 5 |
| 2009 | 1 | 1 |
| 2010 | 1 | 3 |
| 2011 | 0 | 4 |
| 2012 | 2 | 5 |
| 2013 | 4 | 2 |
| 2014 | 1 | 1 |
| 2015 | 3 | 3 |
| 2016 | 0 | 2 |
| 2017 | 3 | 4 |
| 2018 | 3 | 3 |
| 2019 | 5 | 3 |
| 2020 | 2 | 3 |
| 2021 | 3 | 3 |
| 2022 | 2 | 5 |
| 2023 | 4 | 0 |
| 2024 | 4 | 2 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Anti-seize adjustable regulator1 Jul 2025US 12,345,343 B2Robertshaw Controls Company
- Premixing apparatus6 Aug 2024US 12,055,292 B2Rinnai Corporation
- Device for controlling the supply of a combustible gas to a burner of a heating apparatus21 May 2024US 11,988,384 B2Sit S.P.A.
- Valve delivery apparatus13 Feb 2024US 11,898,749 B2Sit S.P.A.
- Device for indicating the status of a gas burner9 Jan 2024US 11,867,396 B2Maxitrol Company
- Partially-premixed gas burner appliance2 May 2024US 2024/0142103 A1Pittway Sarl
- Anti-Seize Adjustable Regulator28 Mar 2024US 2024/0102566 A1Robertshaw Controls Company
- Premixing apparatus, heat source apparatus, and water heater6 Oct 2022US 2022/0316702 A1Purpose Co., Ltd.
- Premixing Apparatus29 Sep 2022US 2022/0307691 A1Rinnai Corporation
- Gas mixing device and gas water heating device21 Jul 2022US 2022/0228743 A1A. O. Smith (China) Water Heater Company Ltd.
Most cited
By later US patents
- Burner ignition system132US 4,717,333 AAdvanced Mechanical Technology, Inc. · 1988
- Two-stage gas valve with natural/LP gas conversion capability90US 5,413,141 AHoneywell Inc. · 1995
- Apparatus for modulating the flow of air and fuel to a gas burner90US 5,520,533 AHoneywell Inc. · 1996
- Modulating gas valve furnace control method82US 5,860,411 ACarrier Corporation · 1999
- Gas burner control system68US 4,483,672 AEssex Group, Inc. · 1984