Method of forming an acoustic bond panel with insertable acoustic assemblies
US-2018297304-A1 · Oct 18, 2018 · US
of hollow pieces, e.g. tubes; of pieces with channels or cavities
of hollow pieces, e.g. tubes; of pieces with channels or cavities · 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 | B32B3/20 |
| Official title | of hollow pieces, e.g. tubes; of pieces with channels or cavities |
| Display label | of hollow pieces, e.g. tubes; of pieces with channels or cavities |
| Total patents | 386 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 8 |
| 2017 | 38 |
| 2018 | 28 |
| 2019 | 64 |
| 2020 | 66 |
| 2021 | 48 |
| 2022 | 35 |
| 2023 | 38 |
| 2024 | 32 |
| 2025 | 17 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Passive radiative dry cooling module/system using metamaterials
US-10060686-B2 · Aug 28, 2018 · US
Composite woven fluidic device
US-2018200714-A1 · Jul 19, 2018 · US
Thermally degradable polymeric fibers
US-9951221-B2 · Apr 24, 2018 · US
Flexible laminate for packaging with integrated peelable portion
US-9928757-B2 · Mar 27, 2018 · US
Vehicle Component with at Least One Sandwich Part
US-2017368788-A1 · Dec 28, 2017 · US
Ceiling system
US-9845596-B2 · Dec 19, 2017 · US
Flexible laminate for packaging with integrated peelable portion
US-2017345344-A1 · Nov 30, 2017 · US
Multilayer composite interior component
US-2017334371-A1 · Nov 23, 2017 · US
Ceramic matrix composite airfoil cooling
US-2017328216-A1 · Nov 16, 2017 · US
Composite Core and Method of Making Same
US-2017320289-A1 · Nov 9, 2017 · US
Method of manufacturing a three-dimensional lattice architecture
US-9809002-B2 · Nov 7, 2017 · US
Veneered element and method of producing such a veneered element
US-2017305119-A1 · Oct 26, 2017 · US
Structural panel, a structural system and a method of forming a structural panel
US-2017297291-A1 · Oct 19, 2017 · US
Membranes with tunable selectivity
US-2017296979-A1 · Oct 19, 2017 · US
Architected materials for enhanced energy absorption
US-2017274619-A1 · Sep 28, 2017 · US
Artificial defect material and manufacturing method of frp structure
US-2017274604-A1 · Sep 28, 2017 · US
High strength vibrational-dampened components
US-2017268120-A1 · Sep 21, 2017 · US
System, method and apparatus for gypsum board with embedded structure having open cells that are substantially filled
US-2017225426-A1 · Aug 10, 2017 · US
Composite core and method of making same
US-9713913-B2 · Jul 25, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B32B3/20?
- CPC B32B3/20 is the Cooperative Patent Classification code for “of hollow pieces, e.g. tubes; of pieces with channels or cavities.”
- How many patents are filed under CPC B32B3/20 (of hollow pieces, e.g. tubes; of pieces with channels or cavities)?
- Our database includes 386 publications tagged with this CPC code.
- Is patent activity under CPC B32B3/20 growing?
- Publication counts under this code: 32 in 2024 vs 17 in 2025 (latest complete years).