Evaporator
US-2018340737-A1 · Nov 29, 2018 · US
polygonal, e.g. rectangular {(F28F1/022 takes precedence)}
polygonal, e.g. rectangular {(F28F1/022 takes precedence)} · 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 | F28F1/04 |
| Official title | polygonal, e.g. rectangular {(F28F1/022 takes precedence)} |
| Display label | polygonal, e.g. rectangular {(F28F1/022 takes precedence)} |
| Total patents | 232 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 11 |
| 2016 | 13 |
| 2017 | 20 |
| 2018 | 18 |
| 2019 | 28 |
| 2020 | 24 |
| 2021 | 24 |
| 2022 | 18 |
| 2023 | 28 |
| 2024 | 26 |
| 2025 | 17 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Heat exchange unit
US-10132572-B2 · Nov 20, 2018 · US
Planar heat pipe
US-10119770-B2 · Nov 6, 2018 · US
Compact heat exchanger
US-10112271-B2 · Oct 30, 2018 · US
Air conditioner
US-2018306515-A1 · Oct 25, 2018 · US
Condenser
US-10107566-B2 · Oct 23, 2018 · US
Methods of forming a heat exchanger
US-2018281048-A1 · Oct 4, 2018 · US
Heat exchanger and refrigeration cycle apparatus including the same
US-2018238637-A1 · Aug 23, 2018 · US
Exhaust gas cooler
US-2018238276-A1 · Aug 23, 2018 · US
Evaporator
US-10041737-B2 · Aug 7, 2018 · US
Flat extruded aluminum multi-port tube whose inner surface is highly corrosion-resistant and an aluminum heat exchanger using the tube
US-2018164052-A1 · Jun 14, 2018 · US
Flow channel member, and heat exchanger and semiconductor module each using same
US-9953898-B2 · Apr 24, 2018 · US
Heat exchange unit
US-2018094874-A1 · Apr 5, 2018 · US
Power generation system using closed or semi-closed brayton cycle recuperator
US-2018080382-A1 · Mar 22, 2018 · US
Waste heat exchanger
US-9915184-B2 · Mar 13, 2018 · US
Arrowhead fin for heat exchange tubing
US-2018023901-A1 · Jan 25, 2018 · US
3d spiral heat exchanger
US-2017370652-A1 · Dec 28, 2017 · US
Swimming Pool Heat Exchangers And Associated Systems And Methods
US-2017356691-A1 · Dec 14, 2017 · US
Heat Exchanger with Precision Manufactured Flow Passages
US-2017335689-A1 · Nov 23, 2017 · US
Planar Heat Pipe
US-2017248378-A1 · Aug 31, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F28F1/04?
- CPC F28F1/04 is the Cooperative Patent Classification code for “polygonal, e.g. rectangular {(F28F1/022 takes precedence)}.”
- How many patents are filed under CPC F28F1/04 (polygonal, e.g. rectangular {(F28F1/022 takes precedence)})?
- Our database includes 232 publications tagged with this CPC code.
- Is patent activity under CPC F28F1/04 growing?
- Publication counts under this code: 26 in 2024 vs 17 in 2025 (latest complete years).