Heat exchanger
US-2021389057-A1 · Dec 16, 2021 · US
the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex · 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 | F28F1/426 |
| Official title | {the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex} |
| Display label | the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex |
| Total patents | 91 |
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 | 11 |
| 2016 | 4 |
| 2017 | 10 |
| 2018 | 7 |
| 2019 | 11 |
| 2020 | 11 |
| 2021 | 12 |
| 2022 | 9 |
| 2023 | 5 |
| 2024 | 8 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Dumbbell shaped plate fin
US-2021356218-A1 · Nov 18, 2021 · US
Heat exchanger tubes
US-2021348855-A1 · Nov 11, 2021 · US
Heat exchanger tubes
US-11073344-B2 · Jul 27, 2021 · US
Heat Exchange Tube, Heat Exchange Tube Manufacturing Method, and Heat Exchanger
US-2021123690-A1 · Apr 29, 2021 · US
Heat transfer tube and method for manufacturing a heat transfer tube
US-10933342-B2 · Mar 2, 2021 · US
Heat exchanger tubes
US-2020340760-A1 · Oct 29, 2020 · US
Heat exchanger, heat exchange method using heat exchanger, heat transport system using heat exchanger, and heat transport method using heat transport system
US-10816283-B2 · Oct 27, 2020 · US
Device and method for forming inside three-dimensional finned tube by multi-edge ploughing and extruding
US-10807145-B2 · Oct 20, 2020 · US
Heat exchanger
US-2020318916-A1 · Oct 8, 2020 · US
Flow path structure of heat exchanger, and heat exchanger
US-2020309471-A1 · Oct 1, 2020 · US
Flat Tube for Microchannel Heat Exchanger and Microchannel Heat Exchanger
US-2020256624-A1 · Aug 13, 2020 · US
Stainless steel and pipe made thereof
US-10627168-B2 · Apr 21, 2020 · US
Heat transfer tube and method for manufacturing a heat transfer tube
US-2020056331-A1 · Feb 20, 2020 · US
Process and apparatus for cooling catalyst
US-10563932-B2 · Feb 18, 2020 · US
Gas furnace
US-2020033027-A1 · Jan 30, 2020 · US
Heat transfer tube and method for manufacturing a heat transfer tube
US-2020024802-A1 · Jan 23, 2020 · US
Heat transfer tube and method for manufacturing a heat transfer tube
US-2019366228-A1 · Dec 5, 2019 · US
Heat exchanger tube
US-10422589-B2 · Sep 24, 2019 · US
Exhaust gas recirculation cooler for an internal combustion engine
US-10415515-B2 · Sep 17, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F28F1/426?
- CPC F28F1/426 is the Cooperative Patent Classification code for “the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex.”
- How many patents are filed under CPC F28F1/426 (the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex)?
- Our database includes 91 publications tagged with this CPC code.
- Is patent activity under CPC F28F1/426 growing?
- Publication counts under this code: 8 in 2024 vs 3 in 2025 (latest complete years).