Method for recovering residual coal pillars by Freezing water accumulated in room-and-pillar mining area
US-12571308-B2 · Mar 10, 2026 · US
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by freezing
by freezing · Cooperative Patent Classification (CPC)
Building, mining, and civil engineering structures.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | E02D3/115 |
| Official title | by freezing |
| Display label | by freezing |
| Total patents | 9 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2017 | 1 |
| 2019 | 3 |
| 2020 | 1 |
| 2021 | 1 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for recovering residual coal pillars by freezing water accumulated in room-and-pillar mining area
US-2025163804-A1 · May 22, 2025 · US
Combination freezing head for nitrogen-brine freezing
US-11085164-B2 · Aug 10, 2021 · US
Device and method for ground freezing
US-10655293-B2 · May 19, 2020 · US
Method for reducing noise emissions on ground freezing construction sites
US-2019309495-A1 · Oct 10, 2019 · US
Combination freezing head for nitrogen-brine freezing
US-2019264415-A1 · Aug 29, 2019 · US
Ground freezing method
US-10196792-B2 · Feb 5, 2019 · US
Method for producing a contiguous ice body in a ground-freezing process
US-9708787-B2 · Jul 18, 2017 · US
Method for producing a contiguous ice body in a ground-freezing process
US-2016265181-A1 · Sep 15, 2016 · US