Hot rolled silicon steel producing method
US-9496078-B2 · Nov 15, 2016 · US
Heat treatment of ferrous alloys
Heat treatment of ferrous alloys · 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 | C21D6/00 |
| Official title | Heat treatment of ferrous alloys |
| Display label | Heat treatment of ferrous alloys |
| Total patents | 597 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 32 |
| 2016 | 52 |
| 2017 | 40 |
| 2018 | 52 |
| 2019 | 62 |
| 2020 | 60 |
| 2021 | 72 |
| 2022 | 68 |
| 2023 | 60 |
| 2024 | 39 |
| 2025 | 49 |
| 2026 | 11 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Multilayer coating
US-2016319435-A1 · Nov 3, 2016 · US
Method of thermomechanical shaping a final product with very high strength and a product produced thereby
US-9481916-B2 · Nov 1, 2016 · US
Method and apparatus for forming a heat-treated material
US-2016316522-A1 · Oct 27, 2016 · US
Hot press-formed product and process for producing same
US-9475112-B2 · Oct 25, 2016 · US
Method of consolidating/molding near net-shaped components made from powders
US-9457404-B2 · Oct 4, 2016 · US
Method for producing r-t-b based sintered magnet
US-2016284468-A1 · Sep 29, 2016 · US
Ducting for manufacture of iron
US-2016258687-A1 · Sep 8, 2016 · US
Case hardened steel having reduced thermal treatment distortion
US-9422613-B2 · Aug 23, 2016 · US
Method for heat treatment of stainless member, and method for producing forged stainless product
US-2016237517-A1 · Aug 18, 2016 · US
Regenerative heat treatment method for heat-resistant metal member suffering from creep damage
US-2016230242-A1 · Aug 11, 2016 · US
Steel sheet and method of manufacturing steel sheet
US-9410231-B2 · Aug 9, 2016 · US
Laser cladding Fe—Cr alloy on downhole tools
US-9382596-B2 · Jul 5, 2016 · US
Articles comprising ferritic stainless steels
US-9376741-B2 · Jun 28, 2016 · US
Fe-based nano-crystalline alloy
US-2016177429-A1 · Jun 23, 2016 · US
Method and device for partially hardening semifinished products
US-2016160326-A1 · Jun 9, 2016 · US
Producing a product from a flexible rolled strip material
US-2016122889-A1 · May 5, 2016 · US
Method for producing powder for magnet
US-2016108502-A1 · Apr 21, 2016 · US
Method and apparatus for hardening a component or semi-finished product
US-2016108485-A1 · Apr 21, 2016 · US
Iron-based composition for fuel element
US-9303295-B2 · Apr 5, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D6/00?
- CPC C21D6/00 is the Cooperative Patent Classification code for “Heat treatment of ferrous alloys.”
- How many patents are filed under CPC C21D6/00 (Heat treatment of ferrous alloys)?
- Our database includes 597 publications tagged with this CPC code.
- Is patent activity under CPC C21D6/00 growing?
- Publication counts under this code: 39 in 2024 vs 49 in 2025 (latest complete years).