Description
Class E21D : SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Subclass 1/12: Sinking shafts Preparation of the ground by freezing
E21D 1/12
Sub-Class
Stats
- 1 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- 0 Total Patent Owners
- 8 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 10221537 | Artificial ground freezing method and artificial ground freezing system | Apr 22, 15 | Mar 05, 19 | Chemical Grouting Co. Ltd. |
Recent Publications
Not Available
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 46 Months (last 2 years Issuances)
- 46 Months (last 5 years Issuances)