Temperature control agent, and heating composition, packaging material, and warming material each comprising same
US-12551367-B2 · Feb 17, 2026 · US
Non-reversible chemical reactions
Non-reversible chemical reactions · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C09K5/18 |
| Official title | Non-reversible chemical reactions |
| Display label | Non-reversible chemical reactions |
| Total patents | 41 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 4 |
| 2017 | 3 |
| 2018 | 5 |
| 2019 | 4 |
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 5 |
| 2023 | 3 |
| 2024 | 2 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Iron-based powder for oxygen reactant and oxygen reactant
US-2025312844-A1 · Oct 9, 2025 · US
Iron-based powder for oxygen reactant and oxygen reactant
US-2025312768-A1 · Oct 9, 2025 · US
Energy conversion arrangement, energy system and aircraft comprising same
US-2025206153-A1 · Jun 26, 2025 · US
Energy conversion arrangement, energy system and aircraft comprising same
US-2025206154-A1 · Jun 26, 2025 · US
Temperature control agent, and heat-generating composition and warming device each using same
US-12042427-B2 · Jul 23, 2024 · US
Water absorbent resin powder for heat-generating element composition, and heat-generating element composition
US-11931290-B2 · Mar 19, 2024 · US
Injectable sacrificial material systems and methods to contain molten corium in nuclear accidents
US-11783954-B2 · Oct 10, 2023 · US
Cooling device with an endothermic chemical reaction
US-11656019-B2 · May 23, 2023 · US
Iron powder for exothermic composition, production method therefor, exothermic composition using said iron powder, and exothermic body production method
US-11629280-B2 · Apr 18, 2023 · US
(co)polymer matrix composites comprising thermally-conductive particles and endothermic particles and methods of making the same
US-2022213372-A1 · Jul 7, 2022 · US
Heat-removing sheet
US-2022213373-A1 · Jul 7, 2022 · US
Heat conductor, heat-conducting material, and package structure of semiconductor device
US-2022216124-A1 · Jul 7, 2022 · US
Injectable sacrificial material systems and methods to contain molten corium in nuclear accidents
US-2022157478-A1 · May 19, 2022 · US
Injectable sacrificial material systems and methods to contain molten corium in nuclear accidents
US-11309096-B1 · Apr 19, 2022 · US
Cooling device with an endothermic chemical reaction
US-2021396447-A1 · Dec 23, 2021 · US
Chain-reactive heat-generating microcapsules
US-11053422-B2 · Jul 6, 2021 · US
Water absorbent resin powder for heat-generating element composition, and heat-generating element composition
US-2021100684-A1 · Apr 8, 2021 · US
Temperature control agent, and heat-generating composition and warming device each using same
US-2020360179-A1 · Nov 19, 2020 · US
Iron powder for exothermic composition, production method therefor, exothermic composition using said iron powder, and exothermic body production method
US-2020157399-A1 · May 21, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C09K5/18?
- CPC C09K5/18 is the Cooperative Patent Classification code for “Non-reversible chemical reactions.”
- How many patents are filed under CPC C09K5/18 (Non-reversible chemical reactions)?
- Our database includes 41 publications tagged with this CPC code.
- Is patent activity under CPC C09K5/18 growing?
- Publication counts under this code: 2 in 2024 vs 4 in 2025 (latest complete years).