Thermal energy storage system combining sensible heat solid material and phase change material
US-9841243-B2 · Dec 12, 2017 · US
of ceramic; of concrete; of natural stone
of ceramic; of concrete; of natural stone · 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 | F28F21/04 |
| Official title | of ceramic; of concrete; of natural stone |
| Display label | of ceramic; of concrete; of natural stone |
| Total patents | 340 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 26 |
| 2016 | 15 |
| 2017 | 30 |
| 2018 | 44 |
| 2019 | 41 |
| 2020 | 41 |
| 2021 | 28 |
| 2022 | 32 |
| 2023 | 29 |
| 2024 | 26 |
| 2025 | 24 |
| 2026 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Thermal rectification device
US-9791183-B2 · Oct 17, 2017 · US
Structure, electronic element module, heat exchanger, fuel rod, and fuel assembly
US-9793011-B2 · Oct 17, 2017 · US
Thermal management in the field of e-mobility
US-2017263988-A1 · Sep 14, 2017 · US
Process for removing nitrous oxide from a gas stream
US-2017246590-A1 · Aug 31, 2017 · US
Heat storage
US-2017248376-A1 · Aug 31, 2017 · US
Flow passage structure
US-2017219148-A1 · Aug 3, 2017 · US
Flow channel member, and heat exchanger and semiconductor module each using same
US-2017200668-A1 · Jul 13, 2017 · US
Heat shielding material, heat shielding composition and heat shielding structure employing the same
US-2017167807-A1 · Jun 15, 2017 · US
Metal-on-ceramic substrates
US-2017151755-A1 · Jun 1, 2017 · US
Ceramic material
US-2017121229-A1 · May 4, 2017 · US
Mobile terminal and heat sink thereof
US-2017118865-A1 · Apr 27, 2017 · US
Composite heat-dissipation substrate and manufacturing method of the same
US-9611415-B2 · Apr 4, 2017 · US
Thermal control insert and thermal resistant hollow block
US-9593890-B2 · Mar 14, 2017 · US
Additive manufacturing of a complex product
US-2017049008-A1 · Feb 16, 2017 · US
Heat dissipation film, dispersion liquid for heat emission layer, method for producing heat dissipation film and solar cell
US-2017047267-A1 · Feb 16, 2017 · US
Heat exchange member and heat exchanger
US-2017038148-A1 · Feb 9, 2017 · US
Three dimensional woven lattices as novel multi-functional architectures
US-2017023310-A1 · Jan 26, 2017 · US
Heat exchanger
US-9534856-B2 · Jan 3, 2017 · US
Thermal energy storage with reduced internal natural convection
US-2016348986-A1 · Dec 1, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F28F21/04?
- CPC F28F21/04 is the Cooperative Patent Classification code for “of ceramic; of concrete; of natural stone.”
- How many patents are filed under CPC F28F21/04 (of ceramic; of concrete; of natural stone)?
- Our database includes 340 publications tagged with this CPC code.
- Is patent activity under CPC F28F21/04 growing?
- Publication counts under this code: 26 in 2024 vs 24 in 2025 (latest complete years).