F23J 13/025
Composed of concentric elements
Official title: {composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L17/04)}
F23J13/025 (Composed of concentric elements) appears on 81 US grants and 42 published applications in this corpus.
Search patents in F23J- Granted patents
- 81
- Published applications
- 42
- Assignees
- 57
- Inventors
- 145
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 5 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 1 | 1 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 2 |
| 2005 | 1 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 4 |
| 2011 | 1 | 0 |
| 2012 | 2 | 1 |
| 2013 | 3 | 1 |
| 2014 | 0 | 2 |
| 2015 | 1 | 1 |
| 2016 | 2 | 2 |
| 2017 | 0 | 5 |
| 2018 | 1 | 2 |
| 2019 | 6 | 3 |
| 2020 | 1 | 5 |
| 2021 | 2 | 0 |
| 2022 | 3 | 3 |
| 2023 | 1 | 1 |
| 2024 | 2 | 2 |
| 2025 | 1 | 4 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Pass-through device for a chimney31 Mar 2026US 12,590,701 B2Jeremias Inc.
- Joint seal system and method25 Mar 2025US 12,259,130 B2The Schebler Co.
- Passive and no-loss weather cap for protection of wind induced downdraft in sensitive exhaust system16 Apr 2024US 11,959,636 B2Uchicago Argonne, LLC
- Apparatus, methods, and systems for providing a modular tubular exhaust27 Feb 2024US 11,913,642 B2
- Cross compatible adapter for chimney sections with different outer diameters21 Nov 2023US 11,821,626 B2Cardinal IP Holding, LLC
- Chimney systems with integrated waste heat recovery and related methods9 Oct 2025US 2025/0314380 A1Enervex, Inc.
- Joint seal system & method18 Sep 2025US 2025/0290630 A1The Schebler Co.
- Joint Seal System & Method3 Jul 2025US 2025/0216073 A1The Schebler Co.
- Vent Attachment for Tankless Water Heater22 May 2025US 2025/0164113 A1Rheem Manufacturing Company
- Joint Seal System & Method29 Aug 2024US 2024/0288163 A1The Schebler Co.
Most cited
By later US patents
- Water heater construction and method of heating water53US 5,020,512 AState Industries, Inc. · 1991
- Method and apparatus for powered flue products exhaust and preheated combustion air supply37US 4,262,608 A1981
- Multiple walled chimney37US 4,929,000 AAmerican Metal Products Company · 1990
- Power vented direct vent system29US 5,012,793 AField Controls, LLC · 1991
- Modular gas fireplace insert29US 6,029,655 AHussong Manufacturing Co., Inc. · 2000