Description
Class E21D : SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Subclass 1/08: Sinking shafts while moving the lining downwards
E21D 1/08
Sub-Class
Stats
- 3 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- 2 Total Patent Owners
- 15 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 10697246 | Shaft enlargement arrangement for a boring system | Jan 25, 16 | Jun 30, 20 | MASTER DRILLING SOUTH AFRICA (PTY) LTD. |
| 8905486 | Underground mining | Jun 30, 10 | Dec 09, 14 | TECHNOLOGICAL RESOURCES PTY. LIMITED |
| 8763344 | Method for erecting an underground construction | Apr 07, 10 | Jul 01, 14 | Herreknecht AG |
Recent Publications
Not Available
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 52 Months (last 2 years Issuances)
- 52 Months (last 5 years Issuances)