Maraging steel
US-2017356070-A1 · Dec 14, 2017 · US
Hardening by precipitation
Hardening by precipitation · 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 | C21D6/02 |
| Official title | Hardening by precipitation |
| Display label | Hardening by precipitation |
| Total patents | 419 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 24 |
| 2016 | 23 |
| 2017 | 24 |
| 2018 | 39 |
| 2019 | 47 |
| 2020 | 38 |
| 2021 | 38 |
| 2022 | 50 |
| 2023 | 51 |
| 2024 | 33 |
| 2025 | 47 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for heat treatment of austenitic steels and austenitic steels obtained thereby
US-2017342520-A1 · Nov 30, 2017 · US
Austenitic stainless steel plate
US-2017298485-A1 · Oct 19, 2017 · US
Nitrided steel member and manufacturing method thereof
US-9783879-B2 · Oct 10, 2017 · US
Process for producing precipitation strengthening martensitic steel
US-9777355-B2 · Oct 3, 2017 · US
Method for manufacturing martensite-based precipitation strengthening stainless steel
US-2017275743-A1 · Sep 28, 2017 · US
Mold steel and mold
US-2017260611-A1 · Sep 14, 2017 · US
Rotors and Methods of Making the Same
US-2017218780-A1 · Aug 3, 2017 · US
Carbonitrided bearing part
US-2017211170-A1 · Jul 27, 2017 · US
Steam turbine, bucket, and method of making bucket
US-2017167265-A1 · Jun 15, 2017 · US
Part obtained from age hardening type bainitic microalloyed steel, process for producing part, and age hardening type bainitic microalloyed steel
US-2017096720-A1 · Apr 6, 2017 · US
Heat-rolled steel plate for tailored rolled blank, tailored rolled blank, and methods for producing these
US-2017044638-A1 · Feb 16, 2017 · US
Creep resistant high temperature martensitic steel
US-9556503-B1 · Jan 31, 2017 · US
Aircraft engine shaft comprising a maraging steel having a tensile strength of 2300MPa or more
US-9506125-B2 · Nov 29, 2016 · US
Turbine blade manufacturing method
US-2016339507-A1 · Nov 24, 2016 · US
Maraging steel
US-2016340752-A1 · Nov 24, 2016 · US
Maraging steel
US-2016340753-A1 · Nov 24, 2016 · US
Enhanced surface structure
US-2016333434-A1 · Nov 17, 2016 · US
Method for producing high-strength duplex stainless steel
US-2016319391-A1 · Nov 3, 2016 · US
Nanostructured ferritic alloy components and related articles
US-2016312653-A1 · Oct 27, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D6/02?
- CPC C21D6/02 is the Cooperative Patent Classification code for “Hardening by precipitation.”
- How many patents are filed under CPC C21D6/02 (Hardening by precipitation)?
- Our database includes 419 publications tagged with this CPC code.
- Is patent activity under CPC C21D6/02 growing?
- Publication counts under this code: 33 in 2024 vs 47 in 2025 (latest complete years).