Girth welded joint of steel pipe
US-2024353033-A1 · Oct 24, 2024 · US
for tubular bodies or pipes
for tubular bodies or pipes · 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 | C21D9/08 |
| Official title | for tubular bodies or pipes |
| Display label | for tubular bodies or pipes |
| Total patents | 840 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 65 |
| 2016 | 43 |
| 2017 | 69 |
| 2018 | 76 |
| 2019 | 108 |
| 2020 | 72 |
| 2021 | 87 |
| 2022 | 92 |
| 2023 | 71 |
| 2024 | 56 |
| 2025 | 83 |
| 2026 | 18 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method and facility for manufacturing seamless steel pipe with excellent toughness
US-2015368734-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
Hot-rolled steel sheet and manufacturing method thereof
US-9200342-B2 · Dec 1, 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
Air cooling equipment for heat treatment process for martensitic stainless steel pipe or tube
US-9181610-B2 · Nov 10, 2015 · US
High-strength stainless steel seamless tube or pipe for oil country tubular goods, and method of manufacturing the same
US-2015315684-A1 · Nov 5, 2015 · US
Seamless steel pipe and method for producing same
US-2015315685-A1 · Nov 5, 2015 · US
Heat treatment equipment line for seamless steel tube or pipe, and method of manufacturing high strength stainless steel tube or pipe
US-2015315667-A1 · Nov 5, 2015 · US
Method for manufacturing seamless steel pipe for line pipe and seamless steel pipe for line pipe
US-9175360-B2 · Nov 3, 2015 · US
Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well
US-2015307972-A1 · Oct 29, 2015 · US
Thin, narrow tube and drawing apparatus and drawing method for manufacturing the same
US-2015297370-A1 · Oct 22, 2015 · US
Ferritic stainless steel having excellent heat resistance
US-2015292068-A1 · Oct 15, 2015 · US
Apparatus and a method for surface processing a metallic structure
US-2015290696-A1 · Oct 15, 2015 · US
Hollow seamless pipe for high-strength spring
US-2015285410-A1 · Oct 8, 2015 · US
High-carbon steel tube having superior cold workability, machinability, and hardenability and method for manufacturing the same
US-2015275339-A1 · Oct 1, 2015 · US
Electric resistance welded steel pipe or steel tube having excellent hic resistance and low-temperature toughness in electric resistance welded part, and method for manufacturing the same
US-2015251268-A1 · Sep 10, 2015 · US
Measuring Element Made of Steel With Hardened Edge Zone
US-2015253230-A1 · Sep 10, 2015 · US
Electric resistance welded oil country tubular goods and manufacturing method of electric resistance welded oil country tubular goods
US-9126283-B2 · Sep 8, 2015 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21D9/08?
- CPC C21D9/08 is the Cooperative Patent Classification code for “for tubular bodies or pipes.”
- How many patents are filed under CPC C21D9/08 (for tubular bodies or pipes)?
- Our database includes 840 publications tagged with this CPC code.
- Is patent activity under CPC C21D9/08 growing?
- Publication counts under this code: 56 in 2024 vs 83 in 2025 (latest complete years).