Vent Attachment for Tankless Water Heater
US-2025164113-A1 · May 22, 2025 · US
composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L17/04)
composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L17/04) · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F23J13/025 |
| Official title | {composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L17/04)} |
| Display label | composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L17/04) |
| Total patents | 25 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 3 |
| 2017 | 5 |
| 2018 | 1 |
| 2019 | 4 |
| 2020 | 6 |
| 2021 | 1 |
| 2022 | 3 |
| 2024 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Passive and no-loss weather cap for protection of wind induced downdraft in sensitive exhaust system
US-11959636-B2 · Apr 16, 2024 · US
Passive and no-loss weather cap for protectionof wind induced downdraft in sensitive exhaust system
US-2022163202-A1 · May 26, 2022 · US
Passive and no-loss weather cap for protection of wind induced downdraft in sensitive exhaust systems
US-11274825-B2 · Mar 15, 2022 · US
Oil boiler
US-11255574-B2 · Feb 22, 2022 · US
Oil boiler
US-11131481-B2 · Sep 28, 2021 · US
Cross compatible adapter for chimney sections with common outer diameters
US-2020378598-A1 · Dec 3, 2020 · US
Cross compatible adapter for chimney sections with different outer diameters
US-2020370749-A1 · Nov 26, 2020 · US
Oil boiler
US-2020348048-A1 · Nov 5, 2020 · US
Oil boiler
US-2020348047-A1 · Nov 5, 2020 · US
Exhaust structure for combustion apparatus
US-10605454-B2 · Mar 31, 2020 · US
Rotary adjustable neck for gas vent cap
US-2020063958-A1 · Feb 27, 2020 · US
Exhaust tube holding member, exhaust structure for combustion apparatus, and method for installing exhaust structure for combustion apparatus
US-10436442-B2 · Oct 8, 2019 · US
Closing member and exhaust structure for combustion apparatus
US-10436443-B2 · Oct 8, 2019 · US
Exhaust tube holding member, exhaust structure for combustion apparatus, and method for installing exhaust structure for combustion apparatus
US-10337735-B2 · Jul 2, 2019 · US
Exhaust tube holding member and exhaust structure for combustion
US-10295180-B2 · May 21, 2019 · US
Passive and no-loss weather cap for protection of wind induced downdraft in sensitive exhaust systems
US-2018017251-A1 · Jan 18, 2018 · US
Exhaust Tube Holding Member, Exhaust Structure for Combustion Apparatus, and Method for Installing Exhaust Structure for Combustion Apparatus
US-2017299176-A1 · Oct 19, 2017 · US
Exhaust Tube Holding Member and Exhaust Structure for Combustion
US-2017299177-A1 · Oct 19, 2017 · US
Closing member and exhaust structure for combustion apparatus
US-2017284665-A1 · Oct 5, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F23J13/025?
- CPC F23J13/025 is the Cooperative Patent Classification code for “composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L17/04).”
- How many patents are filed under CPC F23J13/025 (composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L17/04))?
- Our database includes 25 publications tagged with this CPC code.
- Is patent activity under CPC F23J13/025 growing?
- Publication counts under this code: 1 in 2024 vs 1 in 2025 (latest complete years).