Monolithic combustor bodies
US-11181072-B2 · Nov 23, 2021 · US
the conduits being formed by spirally-wound plates or laminae
the conduits being formed by spirally-wound plates or laminae · 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 | F28D9/04 |
| Official title | the conduits being formed by spirally-wound plates or laminae |
| Display label | the conduits being formed by spirally-wound plates or laminae |
| Total patents | 123 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 7 |
| 2017 | 9 |
| 2018 | 6 |
| 2019 | 8 |
| 2020 | 21 |
| 2021 | 12 |
| 2022 | 15 |
| 2023 | 16 |
| 2024 | 12 |
| 2025 | 11 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Compressed-air heat exchanger, dehumidification unit using heat exchanger, and dehumidification system provided with dehumidification unit
US-11135548-B2 · Oct 5, 2021 · US
Constant density heat exchanger and system for energy conversion
US-11125184-B2 · Sep 21, 2021 · US
Circular crossflow heat exchanger
US-2021270534-A1 · Sep 2, 2021 · US
Energy conversion apparatus and control system
US-10961949-B2 · Mar 30, 2021 · US
Monolithic heat-exchanger bodies
US-2021062756-A1 · Mar 4, 2021 · US
Monolithic heater bodies
US-10859034-B1 · Dec 8, 2020 · US
Energy conversion apparatus
US-2020370446-A1 · Nov 26, 2020 · US
Energy conversion apparatus
US-2020370505-A1 · Nov 26, 2020 · US
Monolithic combustor bodies
US-2020370508-A1 · Nov 26, 2020 · US
Monolithic heater bodies
US-2020370509-A1 · Nov 26, 2020 · US
Monolithic heat-exchanger bodies
US-2020370842-A1 · Nov 26, 2020 · US
Constant density heat exchanger and system for energy conversion
US-2020370503-A1 · Nov 26, 2020 · US
Energy conversion apparatus and control system
US-2020370504-A1 · Nov 26, 2020 · US
Monolithic heater bodies
US-2020370506-A1 · Nov 26, 2020 · US
Recuperator for gas turbine engine
US-10830141-B2 · Nov 10, 2020 · US
Monolithic heat-exchanger bodies
US-10830174-B1 · Nov 10, 2020 · US
Coil-wound heat exchanger for hydrotreatment or hydroconversion
US-10815436-B2 · Oct 27, 2020 · US
A heat exchanger and an additive manufacturing method for manufacturing a heat exchanger
US-2020333089-A1 · Oct 22, 2020 · US
Spiral heat exchanger
US-2020300552-A1 · Sep 24, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F28D9/04?
- CPC F28D9/04 is the Cooperative Patent Classification code for “the conduits being formed by spirally-wound plates or laminae.”
- How many patents are filed under CPC F28D9/04 (the conduits being formed by spirally-wound plates or laminae)?
- Our database includes 123 publications tagged with this CPC code.
- Is patent activity under CPC F28D9/04 growing?
- Publication counts under this code: 12 in 2024 vs 11 in 2025 (latest complete years).