Jet-type direct-fired preheating system
US-2026085374-A1 · Mar 26, 2026 · US
with forced gas circulation; Reheating thereof
with forced gas circulation; Reheating thereof · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C21D1/767 |
| Official title | with forced gas circulation; Reheating thereof |
| Display label | with forced gas circulation; Reheating thereof |
| Total patents | 32 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 6 |
| 2017 | 1 |
| 2018 | 5 |
| 2019 | 4 |
| 2020 | 4 |
| 2021 | 1 |
| 2022 | 3 |
| 2024 | 3 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Slit nozzle and method for manufacturing high-silicon steel strip
US-12403489-B2 · Sep 2, 2025 · US
Hydrogen recycling unit for high pressure gas quenching
US-2025250650-A1 · Aug 7, 2025 · US
Steel material for hot forming, hot formed part, and method for manufacturing thereof
US-2025137086-A1 · May 1, 2025 · US
Method for heating a furnace
US-2024263881-A1 · Aug 8, 2024 · US
Steel sheet, steel member, and coated steel member
US-2024117456-A1 · Apr 11, 2024 · US
Methods and systems for vacuum and oil austempering in producing bainite
US-2024093321-A1 · Mar 21, 2024 · US
Nitriding Treatment Method and Nitriding Treatment Apparatus
US-2022380881-A1 · Dec 1, 2022 · US
System and method to apply multiple thermal treatments to workpiece and related turbomachine components
US-11242588-B2 · Feb 8, 2022 · US
Slit nozzle and method for manufacturing high-silicon steel strip
US-2022008938-A1 · Jan 13, 2022 · US
System and method to apply multiple thermal treatments to workpiece and related turbomachine components
US-2021180169-A1 · Jun 17, 2021 · US
A process for refining a nitrogen-containing metal alloy
US-2020385831-A1 · Dec 10, 2020 · US
Heating furnace for heating annular component
US-10718570-B2 · Jul 21, 2020 · US
Heat treatment device
US-10690416-B2 · Jun 23, 2020 · US
Heat treatment apparatus
US-10648050-B2 · May 12, 2020 · US
Roll-transport device
US-2019360749-A1 · Nov 28, 2019 · US
Continuous annealing system and continuous annealing method
US-10415115-B2 · Sep 17, 2019 · US
Heating device for annular component and annular cavity thereof
US-10378822-B2 · Aug 13, 2019 · US
Heating furnace for heating annular component
US-2019003771-A1 · Jan 3, 2019 · US
Iron-carbon-manganese austenitic steel sheet
US-10131964-B2 · Nov 20, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D1/767?
- CPC C21D1/767 is the Cooperative Patent Classification code for “with forced gas circulation; Reheating thereof.”
- How many patents are filed under CPC C21D1/767 (with forced gas circulation; Reheating thereof)?
- Our database includes 32 publications tagged with this CPC code.
- Is patent activity under CPC C21D1/767 growing?
- Publication counts under this code: 3 in 2024 vs 3 in 2025 (latest complete years).