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

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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
9,404,364 Rock bolting system, method of installing rock bolts, and flexible bolt centralizer Jan 26, 15 Aug 02, 16 1311854 ONTARIO LIMITED, 1311854 ONTARIO LIMITED

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Recent Publications

Not Available
Publication #TitleFiling DatePub DatePatent Owner
2016/0245,082 PUMPABLE MINE VENTILATION STRUCTURE Feb 20, 15 Aug 25, 16 HEINTZMANN CORPORATION,
2016/0237,819 Rib Strap Feb 12, 16 Aug 18, 16 FCI HOLDINGS DELAWARE, INC.,
2016/0230,552 TUNNEL BORING DEVICE, AND CONTROL METHOD THEREFOR Nov 05, 14 Aug 11, 16 KOMATSU LTD.,
2016/0230,553 TUNNEL BORING DEVICE, AND CONTROL METHOD THEREFOR Nov 04, 14 Aug 11, 16 KOMATSU LTD.,
2016/0230,554 ADVANCING RAM PIN RETENTION DEVICE Feb 11, 15 Aug 11, 16 JOY MM DELAWARE, INC.,

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Patents Issued To Date - By Filing Year

Average Time to Issuance

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