Immobilized mining microbial accelerator based on biosurfactant bacteria and preparation method thereof
US-2025327019-A1 · Oct 23, 2025 · US
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Rock dusting of mines; Depositing other protective substances
Rock dusting of mines; Depositing other protective substances · Cooperative Patent Classification (CPC)
Building, mining, and civil engineering structures.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | E21F5/08 |
| Official title | Rock dusting of mines; Depositing other protective substances |
| Display label | Rock dusting of mines; Depositing other protective substances |
| Total patents | 15 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2017 | 3 |
| 2019 | 1 |
| 2020 | 4 |
| 2021 | 2 |
| 2022 | 1 |
| 2023 | 2 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Fire-prevention and extinguishing material for plugging air leakage in underground barrier pillar of coal mine and use method thereof
US-12326087-B1 · Jun 10, 2025 · US
Fly ash-based environmentally-friendly hydrogel with high water retention for preventing and controlling spontaneous combustion of coal in mine and preparation method thereof
US-11718792-B2 · Aug 8, 2023 · US
Fly ash-based environmentally-friendly hydrogel with high water retention for preventing and controlling spontaneous combustion of coal in mine and preparation method thereof
US-2023167366-A1 · Jun 1, 2023 · US
Non-caking mine rock dust for use in underground coal mines
US-11421531-B2 · Aug 23, 2022 · US
Moisture tolerant rock dust and methods of application thereof
US-11111786-B2 · Sep 7, 2021 · US
Plastic gel material for preventing spontaneous combustion of coal
US-2021154510-A1 · May 27, 2021 · US
Non-caking mine rock dust for use in underground coal mines
US-2020109629-A1 · Apr 9, 2020 · US
Combined automatic anti-explosion method for gas drainage pipeline
US-10612379-B2 · Apr 7, 2020 · US
Combined automatic anti-explosion method for gas drainage pipeline
US-2020040726-A1 · Feb 6, 2020 · US
Non-caking mine rock dust for use in underground coal mines
US-10533417-B2 · Jan 14, 2020 · US
Pneumatic mine dust sampling instrument
US-10371605-B2 · Aug 6, 2019 · US
Moisture tolerant rock dust and methods of application thereof
US-2017226854-A1 · Aug 10, 2017 · US
Non-caking mine rock dust for use in underground coal mines
US-2017159437-A1 · Jun 8, 2017 · US
Pneumatic mine dust sampling instrument
US-2017115188-A1 · Apr 27, 2017 · US