Steel
US-2020407815-A1 · Dec 31, 2020 · US
Oils
Oils · 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 | C21D1/58 |
| Official title | Oils |
| Display label | Oils |
| Total patents | 127 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 11 |
| 2017 | 12 |
| 2018 | 12 |
| 2019 | 13 |
| 2020 | 8 |
| 2021 | 12 |
| 2022 | 11 |
| 2023 | 9 |
| 2024 | 14 |
| 2025 | 15 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for producing turbine rotor and method for producing turbine
US-10752970-B2 · Aug 25, 2020 · US
Heat treatment oil composition
US-10731099-B2 · Aug 4, 2020 · US
Cold rolling mill and cold rolling method
US-2020230673-A1 · Jul 23, 2020 · US
Wire rod for springs with excellent corrosion fatigue resistance, steel wire, and manufacturing method thereof
US-2020063228-A1 · Feb 27, 2020 · US
Tool with cutting edge and method of manufacturing it
US-2020061747-A1 · Feb 27, 2020 · US
Crankshaft and method of manufacture
US-2020048727-A1 · Feb 13, 2020 · US
Method for thermally treating ring-shaped member
US-10508318-B2 · Dec 17, 2019 · US
Water-based coolant
US-10421924-B2 · Sep 24, 2019 · US
Hybrid quench process for hot stamping of steel parts
US-2019241987-A1 · Aug 8, 2019 · US
Sucker rod steel and manufacturing method therefor
US-2019169706-A1 · Jun 6, 2019 · US
Laser-hardened fillet-rolled crankshaft
US-2019143398-A1 · May 16, 2019 · US
Track bushing
US-10287648-B2 · May 14, 2019 · US
Nitrided track pin for track chain assembly of machine
US-10272960-B2 · Apr 30, 2019 · US
System and method of making a cast part
US-10266907-B2 · Apr 23, 2019 · US
Piston ring and its production method
US-10227670-B2 · Mar 12, 2019 · US
Manufacturing method of precision machine tool bearing with high precision stability
US-10228022-B2 · Mar 12, 2019 · US
Metal hydride alloys with improved rate performance
US-10211457-B2 · Feb 19, 2019 · US
Method of heat treating a fastening member
US-2019017141-A1 · Jan 17, 2019 · US
Large crankshaft
US-2019010589-A1 · Jan 10, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D1/58?
- CPC C21D1/58 is the Cooperative Patent Classification code for “Oils.”
- How many patents are filed under CPC C21D1/58 (Oils)?
- Our database includes 127 publications tagged with this CPC code.
- Is patent activity under CPC C21D1/58 growing?
- Publication counts under this code: 14 in 2024 vs 15 in 2025 (latest complete years).