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
9,429,016 Method for replacing a tunnel boring machine roller cutter, handling device and roller cutter suited to such a method Dec 14, 10 Aug 30, 16 BOUYGUES TRAVAUX PUBLICS, BOUYGUES TRAVAUX PUBLICS
9,429,017 Method and system of coal mine roof stabilization Jul 02, 15 Aug 30, 16 REI, INC., REI, INC.

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Recent Publications

Not Available
Publication #TitleFiling DatePub DatePatent Owner
2016/0273,358 CUTTER HOLDER FOR A TUNNEL BORING MACHINE AND AN ASSOCIATED CUTTING SET Nov 04, 14 Sep 22, 16 , Not available

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Patents Issued To Date - By Filing Year

Average Time to Issuance

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