Method for thermal activation of coal gangue and in-situ carbon fixation utilizing waste heat from steel slag
US-2025376416-A1 · Dec 11, 2025 · US
Waste or refuse used as fuel
Waste or refuse used as fuel · 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 | C04B7/4423 |
| Official title | {Waste or refuse used as fuel} |
| Display label | Waste or refuse used as fuel |
| Total patents | 31 |
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 | 5 |
| 2016 | 4 |
| 2017 | 3 |
| 2021 | 8 |
| 2022 | 6 |
| 2023 | 2 |
| 2024 | 1 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for producing cement clinker
US-2025214891-A1 · Jul 3, 2025 · US
Portland cement manufacture using municipal solid waste incineration ash
US-2024182362-A1 · Jun 6, 2024 · US
Reactor and method for conversion of a carbonaceous material
US-2023173448-A1 · Jun 8, 2023 · US
Organic sludge treatment device and treatment method
US-11591246-B2 · Feb 28, 2023 · US
Portland cement manufacture using municipal solid waste incineration ash
US-2022332638-A1 · Oct 20, 2022 · US
Thermal treatment of mineral materials in a reducing atmosphere using alternative fuels
US-2022316800-A1 · Oct 6, 2022 · US
Cement kiln burner device and method for operating the same
US-11428402-B2 · Aug 30, 2022 · US
Combustible waste injection device and method for operating the same
US-11421871-B2 · Aug 23, 2022 · US
Combustible waste injection device and method for operating the same
US-2022163198-A1 · May 26, 2022 · US
Cement kiln burner device and method for operating the same
US-11306915-B2 · Apr 19, 2022 · US
Cement kiln burner device and method for operating the same
US-2021404649-A1 · Dec 30, 2021 · US
Cement kiln burner device and method for operating the same
US-11112111-B2 · Sep 7, 2021 · US
Cement kiln burner device and method for operating the same
US-2021222875-A1 · Jul 22, 2021 · US
Cement kiln burner device and method for operating the same
US-2021222874-A1 · Jul 22, 2021 · US
Combustible waste injection device and method for operating the same
US-11029025-B2 · Jun 8, 2021 · US
Portland cement manufacture using municipal solid waste incineration ash
US-2021078902-A1 · Mar 18, 2021 · US
Combustible waste injection device and method for operating the same
US-2021054996-A1 · Feb 25, 2021 · US
Organic sludge treatment device and treatment method
US-2021009455-A1 · Jan 14, 2021 · US
Lignocellulosic biomass fermentation process co-product fuel for cement kiln
US-2017305791-A1 · Oct 26, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C04B7/4423?
- CPC C04B7/4423 is the Cooperative Patent Classification code for “Waste or refuse used as fuel.”
- How many patents are filed under CPC C04B7/4423 (Waste or refuse used as fuel)?
- Our database includes 31 publications tagged with this CPC code.
- Is patent activity under CPC C04B7/4423 growing?
- Publication counts under this code: 1 in 2024 vs 2 in 2025 (latest complete years).