Girth welded joint of steel pipe
US-2024353033-A1 · Oct 24, 2024 · US
for welded joints
for welded joints · 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 | C21D9/50 |
| Official title | for welded joints |
| Display label | for welded joints |
| Total patents | 578 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 47 |
| 2016 | 48 |
| 2017 | 53 |
| 2018 | 44 |
| 2019 | 61 |
| 2020 | 66 |
| 2021 | 60 |
| 2022 | 57 |
| 2023 | 47 |
| 2024 | 47 |
| 2025 | 42 |
| 2026 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Pre-weld heat treatment for a nickel based superalloy
US-9528175-B2 · Dec 27, 2016 · US
High-strength stainless steel pipe
US-2016355901-A1 · Dec 8, 2016 · US
Steel plate and method for manufacturing same (as amended)
US-2016312327-A1 · Oct 27, 2016 · US
Processes for producing and treating thin-films composed of nanomaterials
US-2016250712-A1 · Sep 1, 2016 · US
Electric resistance welded steel pipe for oil well
US-2016230241-A1 · Aug 11, 2016 · US
Friction stir welding method for steel sheets and method of manufacturing joint
US-2016221117-A1 · Aug 4, 2016 · US
Method of manufacture of a ceramic metallization for ceramic metal transition, and ceramic metal transition itself
US-2016184913-A1 · Jun 30, 2016 · US
Assembly of hardened components and method for production
US-2016186280-A1 · Jun 30, 2016 · US
Pyrolysis Furnace Tubes
US-2016168480-A1 · Jun 16, 2016 · US
Method for forming blank and method for determining preforming shape
US-2016160311-A1 · Jun 9, 2016 · US
Welding method and weld structure
US-2016076117-A1 · Mar 17, 2016 · US
Method for manufacturing superior 13cr friction-welded drillrod
US-2016076315-A1 · Mar 17, 2016 · US
Presintered preform for repair of superalloy component
US-2015367456-A1 · Dec 24, 2015 · US
Hot-rolled steel sheet for high strength linepipe having tensile strength of 540 mpa or more
US-2015368737-A1 · Dec 24, 2015 · US
500 MPa GRADE LONGITUDINALLY WELDED STEEL PIPE WITH LOW YIELD RATIO AND MANUFACTURING METHOD THEREFOR
US-2015361518-A1 · Dec 17, 2015 · US
Austenitic steel welded joint
US-9211601-B2 · Dec 15, 2015 · US
Method of executing water jet peening
US-9193034-B2 · Nov 24, 2015 · US
Induction heating system temperature sensor assembly
US-2015334781-A1 · Nov 19, 2015 · US
Abnormal Grain Growth Suppression in AL Alloys
US-2015329948-A1 · Nov 19, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D9/50?
- CPC C21D9/50 is the Cooperative Patent Classification code for “for welded joints.”
- How many patents are filed under CPC C21D9/50 (for welded joints)?
- Our database includes 578 publications tagged with this CPC code.
- Is patent activity under CPC C21D9/50 growing?
- Publication counts under this code: 47 in 2024 vs 42 in 2025 (latest complete years).