Class E21D : SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Subclass 5/04: Lining shafts; Linings therefor (E21D 11/00 takes precedence) with brick, concrete, stone, or similar building materials (E21D 5/01, E21D 5/012, E21D 5/016 take precedence)
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11512591 | Shuttering with supporting ring having expendable drawers | Nov 13, 19 | Nov 29, 22 | REDPATH DEILMANN GmbH |
| 10697246 | Shaft enlargement arrangement for a boring system | Jan 25, 16 | Jun 30, 20 | MASTER DRILLING SOUTH AFRICA (PTY) LTD. |
| 9995086 | Center-pillared full-face shaft drilling machine | Dec 09, 14 | Jun 12, 18 | Not available |
| 9945229 | Formwork system | Mar 06, 17 | Apr 17, 18 | Not available |
| 9617705 | Retainment wall for underground mine and method of construction | May 13, 15 | Apr 11, 17 | HEINTZMANN CORPORATION, Sturda Inc., |
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