E21D

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Description

SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS (soil-conditioning or soil-stabilising materials C09K 17/00; cutting machines for mining or quarrying E21C; safety devices, transport, rescue, ventilation or drainage E21F)

Subclasses

Not Available
Subclass Title
1/00 Sinking shafts
1/02 Sinking shafts by hand
1/03 Sinking shafts mechanically (E21D 1/08 takes precedence)
1/04 Sinking shafts mechanically (E21D 1/08 takes precedence) with grabs
1/06 Sinking shafts mechanically (E21D 1/08 takes precedence) with shaft-boring cutters (drilling machines E21B)

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Recent Patents

Not Available
Patent #TitleFiling DateIssue DatePatent Owner
9,534,495 Rock anchoring system and method Oct 25, 13 Jan 03, 17 , Not available
9,528,541 Holder for casting into a concrete element Oct 05, 12 Dec 27, 16 MEESE GMBH, MEESE GMBH

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Recent Publications

Not Available
Publication #TitleFiling DatePub DatePatent Owner
2017/0009,580 ROCK ANCHOR GROUTING TOOL Jul 08, 15 Jan 12, 17 , Not available
2016/0369,629 Center-pillared Full-Face Shaft Drilling Machine Dec 09, 14 Dec 22, 16 CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO., LTD.,

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Patents Issued To Date - By Filing Year

Average Time to Issuance

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