Decompression heat-insulating pipe structure
US-2018224053-A1 · Aug 9, 2018 · US
Double-walled pipes; Multi-channel pipes or pipe assemblies
Double-walled pipes; Multi-channel pipes or pipe assemblies · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F16L9/18 |
| Official title | Double-walled pipes; Multi-channel pipes or pipe assemblies |
| Display label | Double-walled pipes; Multi-channel pipes or pipe assemblies |
| Total patents | 249 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 20 |
| 2016 | 13 |
| 2017 | 23 |
| 2018 | 23 |
| 2019 | 32 |
| 2020 | 38 |
| 2021 | 31 |
| 2022 | 18 |
| 2023 | 11 |
| 2024 | 17 |
| 2025 | 14 |
| 2026 | 9 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Tube assembly
US-2018187982-A1 · Jul 5, 2018 · US
Subsea Pipe-in-Pipe Structures
US-2018031164-A1 · Feb 1, 2018 · US
Connections for subsea pipe-in-pipe structures
US-9857011-B2 · Jan 2, 2018 · US
Pipe arrangement with support sections on the outer pipe
US-2017356590-A1 · Dec 14, 2017 · US
Double walled tube and manufacture thereof
US-2017350540-A1 · Dec 7, 2017 · US
Inline Cycle Fuse
US-2017350867-A1 · Dec 7, 2017 · US
Improving the Bending Behaviour of Mechanically-Lined Rigid Pipe
US-2017341119-A1 · Nov 30, 2017 · US
Double wall tube assemblies
US-9829124-B2 · Nov 28, 2017 · US
Shrouded pipe
US-2017335997-A1 · Nov 23, 2017 · US
Methods of manufacturing a double-walled tube
US-2017332700-A1 · Nov 23, 2017 · US
Shrouded pipe
US-2017336007-A1 · Nov 23, 2017 · US
Insulated flowpath assembly
US-2017321824-A1 · Nov 9, 2017 · US
Dual walled titanium tubing and methods of manufacturing the tubing
US-9810348-B2 · Nov 7, 2017 · US
Low temperature fluid dual structure pipe and low temperature fluid dual structure storage tank
US-2017307112-A1 · Oct 26, 2017 · US
Fuel pipe of aircraft and aircraft
US-2017267368-A1 · Sep 21, 2017 · US
Nested hvac lines
US-2017259644-A1 · Sep 14, 2017 · US
Insulated flowpath assembly
US-9759356-B2 · Sep 12, 2017 · US
Double skinned pipe assembly
US-2017254445-A1 · Sep 7, 2017 · US
Double-walled pipe element and method for producing a double-walled pipe element
US-2017219134-A1 · Aug 3, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F16L9/18?
- CPC F16L9/18 is the Cooperative Patent Classification code for “Double-walled pipes; Multi-channel pipes or pipe assemblies.”
- How many patents are filed under CPC F16L9/18 (Double-walled pipes; Multi-channel pipes or pipe assemblies)?
- Our database includes 249 publications tagged with this CPC code.
- Is patent activity under CPC F16L9/18 growing?
- Publication counts under this code: 17 in 2024 vs 14 in 2025 (latest complete years).