Method for controlling amount of silicon added to ductile cast iron, method for casting ductile cast iron, and cast product
US-2022325390-A1 · Oct 13, 2022 · US
Heat treatments of cast-iron
Heat treatments of cast-iron · 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 | C21D5/00 |
| Official title | Heat treatments of cast-iron |
| Display label | Heat treatments of cast-iron |
| Total patents | 86 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 10 |
| 2016 | 6 |
| 2017 | 12 |
| 2018 | 5 |
| 2019 | 6 |
| 2020 | 7 |
| 2021 | 7 |
| 2022 | 13 |
| 2023 | 6 |
| 2024 | 6 |
| 2025 | 8 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method of manufacturing cam piece for continuously variable valve duration and cam piece manufactured therefrom
US-11441204-B2 · Sep 13, 2022 · US
Method for Producing a Brake Element, Brake Element
US-2022267873-A1 · Aug 25, 2022 · US
Process for local hardening
US-11421291-B2 · Aug 23, 2022 · US
Cast iron, in particular for components of disc brakes
US-2022251691-A1 · Aug 11, 2022 · US
Method for manufacturing cast iron casting with fining graphite and suspension part
US-11396041-B2 · Jul 26, 2022 · US
Centrifugally cast composite roll for rolling and its production method
US-11389847-B2 · Jul 19, 2022 · US
Machine component
US-2021404027-A1 · Dec 30, 2021 · US
Iron-based alloy and method of manufacturing the same
US-2021317541-A1 · Oct 14, 2021 · US
Brake disk including decarburized layer and nitride compound layer, and method of manufacturing the same
US-11137041-B2 · Oct 5, 2021 · US
Centrifugally cast composite roll for rolling and its production method
US-2021154712-A1 · May 27, 2021 · US
Durable and low maintenance valve
US-2021148471-A1 · May 20, 2021 · US
Process for Local Hardening
US-2021079490-A1 · Mar 18, 2021 · US
Pressure-limiting valve
US-10890267-B2 · Jan 12, 2021 · US
Austempered grey iron scroll and method of making thereof
US-10844855-B2 · Nov 24, 2020 · US
Ductile iron composition and process of forming a ductile iron component
US-10787726-B2 · Sep 29, 2020 · US
Method for Producing Plated Black Heart Malleable Cast Iron Member, Plated Black Heart Malleable Cast Iron Member, and Pipe Join
US-2020248279-A1 · Aug 6, 2020 · US
Method for heat-treating uppermost surface of spheroidal graphite cast iron and spheroidal graphite cast iron heat-treated by the same
US-2020216923-A1 · Jul 9, 2020 · US
Method for manufacturing cast iron casting with fining graphite and suspension part
US-2020206806-A1 · Jul 2, 2020 · US
Method of manufacturing cam piece for continuously variable valve duration and cam piece manufactured therefrom
US-2020181726-A1 · Jun 11, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D5/00?
- CPC C21D5/00 is the Cooperative Patent Classification code for “Heat treatments of cast-iron.”
- How many patents are filed under CPC C21D5/00 (Heat treatments of cast-iron)?
- Our database includes 86 publications tagged with this CPC code.
- Is patent activity under CPC C21D5/00 growing?
- Publication counts under this code: 6 in 2024 vs 8 in 2025 (latest complete years).