Jet-type direct-fired preheating system
US-2026085374-A1 · Mar 26, 2026 · US
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using boilers
using boilers · 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 | F27D17/15 |
| Official title | using boilers |
| Display label | using boilers |
| Total patents | 22 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2016 | 2 |
| 2017 | 2 |
| 2019 | 2 |
| 2020 | 3 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 3 |
| 2024 | 1 |
| 2025 | 4 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
External combustion air preheat
US-12553669-B2 · Feb 17, 2026 · US
Thermal energy recovery systems for non-contact temperature detection of molten steel in steelmaking process
US-12503736-B1 · Dec 23, 2025 · US
Calcination apparatus and processes with improved co2 capture
US-2025313508-A1 · Oct 9, 2025 · US
Total heat energy recovery system for furnace-process phosphoric acid
US-12398039-B2 · Aug 26, 2025 · US
Method for operating a fired furnace and arrangement comprising such a furnace
US-12330979-B2 · Jun 17, 2025 · US
Method and installation for producing lime or dolime
US-2024217873-A1 · Jul 4, 2024 · US
External combustion air preheat
US-2023324123-A1 · Oct 12, 2023 · US
Flue gas purification and waste heat utilization system and method
US-11617985-B2 · Apr 4, 2023 · US
Flue gas purification and waste heat utilization system and method
US-2023001352-A1 · Jan 5, 2023 · US
Method for operating a fired furnace and arrangement comprising such a furnace
US-2022348489-A1 · Nov 3, 2022 · US
Total Heat Energy Recovery System For Furnace-Process Phosphoric Acid
US-2022281747-A1 · Sep 8, 2022 · US
Gasification reactor with shared partial reactor vessels
US-10948180-B2 · Mar 16, 2021 · US
Gasification Reactor with Shared Partial Reactor Vessels
US-2020191384-A1 · Jun 18, 2020 · US
Process for the production of sulfur trioxide
US-10640376-B2 · May 5, 2020 · US
System and method for regulating the viscosity of a fluid prior to atomization
US-10596583-B2 · Mar 24, 2020 · US
A process for the production of sulfur trioxide
US-2019177161-A1 · Jun 13, 2019 · US
Method and arrangement for feeding process gases from a suspension smelting furnace into a waste heat boiler
US-10203158-B2 · Feb 12, 2019 · US
System and method for regulating the viscosity of a fluid prior to atomization
US-2017326569-A1 · Nov 16, 2017 · US
System for recovering waste heat
US-9574829-B2 · Feb 21, 2017 · US