Systems and methods for operating a furnace system
US-12359846-B2 · Jul 15, 2025 · US
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Preventing or detecting blocked flues
Preventing or detecting blocked flues · 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 | F24H15/112 |
| Official title | Preventing or detecting blocked flues |
| Display label | Preventing or detecting blocked flues |
| Total patents | 18 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2019 | 3 |
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 1 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Feedback warning system using inducer pulse width modulation signal
US-12298038-B2 · May 13, 2025 · US
Feedback warning system using inducer pulse width modulation signal
US-2024035705-A1 · Feb 1, 2024 · US
Feedback warning system using inducer pulse width modulation signal
US-11781785-B2 · Oct 10, 2023 · US
RPM control method for inducer for gas furnace
US-11592176-B2 · Feb 28, 2023 · US
Dual input water heater
US-11435113-B2 · Sep 6, 2022 · US
Systems and methods for operating a furnace system
US-2022136736-A1 · May 5, 2022 · US
Oil boiler
US-11255574-B2 · Feb 22, 2022 · US
Combustion device
US-2021364192-A1 · Nov 25, 2021 · US
Water heater blower leakage detection
US-11079139-B2 · Aug 3, 2021 · US
Rpm control method for inducer for gas furnace
US-2021215340-A1 · Jul 15, 2021 · US
Oil boiler
US-2020348047-A1 · Nov 5, 2020 · US
Feedback warning system using inducer pulse width modulation signal
US-2020292182-A1 · Sep 17, 2020 · US
Water heater blower leakage detection
US-2020096232-A1 · Mar 26, 2020 · US
Water heater
US-10386092-B2 · Aug 20, 2019 · US
Dual input water heater
US-2019242620-A1 · Aug 8, 2019 · US
Combustion control system of gas water heater or wall-hanging boiler and control method thereof
US-10309687-B2 · Jun 4, 2019 · US
Water heater
US-2016010892-A1 · Jan 14, 2016 · US