Melting Furnace and Method for Melting a Metal Material
US-2026071819-A1 · Mar 12, 2026 · US
of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces
of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces · 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 | F27B3/04 |
| Official title | of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces |
| Display label | of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces |
| Total patents | 26 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 3 |
| 2017 | 6 |
| 2019 | 1 |
| 2020 | 2 |
| 2021 | 3 |
| 2022 | 1 |
| 2023 | 1 |
| 2024 | 3 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for operating electric furnace
US-2025383152-A1 · Dec 18, 2025 · US
Biomass direct reduced iron
US-2025179596-A1 · Jun 5, 2025 · US
Stack melting apparatus
US-2025180292-A1 · Jun 5, 2025 · US
Electric furnace
US-2025093100-A1 · Mar 20, 2025 · US
Method for smelting low nitrogen steel using electric furnace
US-12018341-B2 · Jun 25, 2024 · US
Electric furnace
US-11898797-B2 · Feb 13, 2024 · US
Repositionable molten metal pump
US-11874062-B2 · Jan 16, 2024 · US
Apparatus and method for preparing carbon black
US-11591224-B2 · Feb 28, 2023 · US
Systems and methods for casting metallic materials
US-2022003497-A1 · Jan 6, 2022 · US
Method for smelting low nitrogen steel using electric furnace
US-2021355555-A1 · Nov 18, 2021 · US
Systems and methods for casting metallic materials
US-11150021-B2 · Oct 19, 2021 · US
Repositionable molten metal pump
US-2021310736-A1 · Oct 7, 2021 · US
Apparatus and method for preparing carbon black
US-2020172403-A1 · Jun 4, 2020 · US
Electric furnace
US-2020080780-A1 · Mar 12, 2020 · US
Rotary hearth furnace
US-10294535-B2 · May 21, 2019 · US
Fiber oxidation oven with multiple independently controllable heating systems
US-9809909-B2 · Nov 7, 2017 · US
Process and arrangement for extracting a metal from slag a containing said metal
US-9733016-B2 · Aug 15, 2017 · US
Rotary hearth furnace
US-2017198365-A1 · Jul 13, 2017 · US
Fiber oxidation oven with multiple independently controllable heating systems
US-2017107646-A1 · Apr 20, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F27B3/04?
- CPC F27B3/04 is the Cooperative Patent Classification code for “of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces.”
- How many patents are filed under CPC F27B3/04 (of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces)?
- Our database includes 26 publications tagged with this CPC code.
- Is patent activity under CPC F27B3/04 growing?
- Publication counts under this code: 3 in 2024 vs 4 in 2025 (latest complete years).