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
9597935 Towing implement for vehicle with a passage and related method Aug 01, 14 Mar 21, 17 , J.H. FLETCHER & CO.
9598910 Rotational drill bits and drilling apparatuses including the same Jul 25, 14 Mar 21, 17 , DOVER BMCS ACQUISITION CORPORATION
9581022 Free-wheeling-resistant rolls for mining roof support and the combination of a mining machine and such rolls May 09, 14 Feb 28, 17 THE TENSAR CORPORATION, TENSAR CORPORATION
9578678 Methods and apparatus for facilitating locate and marking operations Jul 31, 15 Feb 21, 17 CERTUSVIEW TECHNOLOGIES, LLC, CERTUSVIEW TECHNOLOGIES, LLC

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Recent Publications

Not Available
Publication #TitleFiling DatePub DatePatent Owner
2017/0067,339 FOAM GENERATOR FOR AN EARTH PRESSURE BALANCE SHIELD TUNNEL BORING MACHINE AND METHOD FOR CONDITIONING REMOVED SOIL MATERIAL AS A SUPPORTING MEDIUM FOR AN EARTH PRESSURE BALANCE SHIELD Feb 18, 15 Mar 09, 17 , Not available
2017/0067,340 UNDERGROUND SECURING SYSTEM COMPRISING A ROCK BOLT THAT INCLUDES AN ATTACHMENT DEVICE Feb 25, 15 Mar 09, 17 K+S KALI GMBH,

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Patents Issued To Date - By Filing Year

Average Time to Issuance

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