Press-fitting corrosion resistant liners in nozzles and casings
US-9828918-B2 · Nov 28, 2017 · US
Tubular or hollow articles
Tubular or hollow articles · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B23K2101/04 |
| Official title | Tubular or hollow articles |
| Display label | Tubular or hollow articles |
| Total patents | 389 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 15 |
| 2016 | 18 |
| 2017 | 34 |
| 2018 | 33 |
| 2019 | 55 |
| 2020 | 48 |
| 2021 | 41 |
| 2022 | 32 |
| 2023 | 48 |
| 2024 | 37 |
| 2025 | 24 |
| 2026 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Friction welded heavy weight drill pipes
US-9816328-B2 · Nov 14, 2017 · US
System and method for venting air in a welding system
US-2017304927-A1 · Oct 26, 2017 · US
Steel strip for electric-resistance-welded steel pipe or tube, electric-resistance-welded steel pipe or tube, and process for producing steel strip for electric-resistance-welded steel pipe or tube
US-2017307111-A1 · Oct 26, 2017 · US
Metallic Tubular Members for use in HVAC or Refrigeration Systems and Methods of Manufacturing the Same
US-2017307233-A1 · Oct 26, 2017 · US
Diaphragm bellows
US-9797516-B2 · Oct 24, 2017 · US
Method of producing insulating three-dimensional (3d) structures using 3d printing
US-2017274456-A1 · Sep 28, 2017 · US
Hybrid article, method for forming hybrid article, and method for closing aperture
US-2017274624-A1 · Sep 28, 2017 · US
Method for brazing and use of a brazing foil for induction brazing
US-2017252872-A1 · Sep 7, 2017 · US
Welding system and welding method of cylindrical structures
US-2017232540-A1 · Aug 17, 2017 · US
Endoscope having pipe connection structure and producing method thereof
US-2017227149-A1 · Aug 10, 2017 · US
Casting mold having at least one cavity for manufacturing at least one cast article
US-2017225223-A1 · Aug 10, 2017 · US
Machine component and method for producing the same
US-2017216950-A1 · Aug 3, 2017 · US
Methods and apparatuses for fabricating glass articles
US-2017197862-A1 · Jul 13, 2017 · US
Diaphragm bellows
US-2017175901-A1 · Jun 22, 2017 · US
Air intake apparatus and manufacturing method of air intake apparatus
US-9683530-B2 · Jun 20, 2017 · US
Constant velocity universal joint outer joint member and manufacturing method for same
US-2017159719-A1 · Jun 8, 2017 · US
Metal forming method and formed product
US-9662741-B2 · May 30, 2017 · US
Pipe connection structure in endoscope and producing method thereof
US-9661985-B2 · May 30, 2017 · US
Rotary friction welding
US-2017129048-A1 · May 11, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B23K2101/04?
- CPC B23K2101/04 is the Cooperative Patent Classification code for “Tubular or hollow articles.”
- How many patents are filed under CPC B23K2101/04 (Tubular or hollow articles)?
- Our database includes 389 publications tagged with this CPC code.
- Is patent activity under CPC B23K2101/04 growing?
- Publication counts under this code: 37 in 2024 vs 24 in 2025 (latest complete years).