Heat storage apparatus, method for storing heat, and method for producing heat storage apparatus
US-10161688-B2 · Dec 25, 2018 · US
Heat exchange elements made from metals or metal alloys
Heat exchange elements made from metals or metal alloys · 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 | F28F21/081 |
| Official title | {Heat exchange elements made from metals or metal alloys} |
| Display label | Heat exchange elements made from metals or metal alloys |
| Total patents | 235 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 12 |
| 2016 | 13 |
| 2017 | 20 |
| 2018 | 26 |
| 2019 | 24 |
| 2020 | 32 |
| 2021 | 26 |
| 2022 | 29 |
| 2023 | 20 |
| 2024 | 17 |
| 2025 | 14 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Gadolinium wire rod, and metal-covered gadolinium wire rod, heat exchanger and magnetic refrigerator using the same
US-2018350490-A1 · Dec 6, 2018 · US
System and Method for Shape Memory Alloy Thermal Interface
US-2018305043-A1 · Oct 25, 2018 · US
Additively manufactured heat exchangers
US-2018250747-A1 · Sep 6, 2018 · US
Cab/maar concept improvement
US-2018238626-A1 · Aug 23, 2018 · US
Method of manufacturing a heat exchanger
US-2018236552-A1 · Aug 23, 2018 · US
Composite material containing graphene
US-2018179056-A1 · Jun 28, 2018 · US
Modular Shell-and-Tube Heat Exchanger Apparatuses and Molds and Methods for Forming Such Apparatuses
US-2018180363-A1 · Jun 28, 2018 · US
Heat pipe, heat dissipating component, and method for manufacturing heat pipe
US-2018128554-A1 · May 10, 2018 · US
Thermally emissive sensing materials for chemical spectroscopy analysis
US-9964494-B1 · May 8, 2018 · US
Composite material containing graphene
US-9932226-B2 · Apr 3, 2018 · US
Heat exchangers with multiple flow channels
US-2018051934-A1 · Feb 22, 2018 · US
Thermal storage heat exchanger structures employing phase change materials
US-2018031333-A1 · Feb 1, 2018 · US
Spacecraft and spacecraft radiator panels with composite face-sheets
US-9878808-B2 · Jan 30, 2018 · US
Exhaust gas heat exchanger
US-9874404-B2 · Jan 23, 2018 · US
Finned Heat Exchanger
US-2017356692-A1 · Dec 14, 2017 · US
Dual material vapor chamber and upper shell thereof
US-9841246-B2 · Dec 12, 2017 · US
Semiconductor package with top side cooling heat sink thermal pathway
US-9812373-B2 · Nov 7, 2017 · US
Flat tube for a heat exchanger
US-2017314875-A1 · Nov 2, 2017 · US
Dual material vapor chamber and upper shell thereof
US-2017268835-A1 · Sep 21, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F28F21/081?
- CPC F28F21/081 is the Cooperative Patent Classification code for “Heat exchange elements made from metals or metal alloys.”
- How many patents are filed under CPC F28F21/081 (Heat exchange elements made from metals or metal alloys)?
- Our database includes 235 publications tagged with this CPC code.
- Is patent activity under CPC F28F21/081 growing?
- Publication counts under this code: 17 in 2024 vs 14 in 2025 (latest complete years).