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Hydraulically operated extension devices
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CPC
E21D17/0206
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Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D17/00
Caps for supporting mine roofs
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E21D17/0206
Hydraulically operated extension devices
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Patents Grants
last 30 patents
Information
Patent Grant
3902325
Patent number
3,902,325
Issue date
Sep 2, 1975
E21 - EARTH DRILLING MINING
Information
Patent Grant
3686874
Patent number
3,686,874
Issue date
Aug 29, 1972
E21 - EARTH DRILLING MINING
Information
Patent Grant
3640574
Patent number
3,640,574
Issue date
Feb 8, 1972
E21 - EARTH DRILLING MINING
Information
Patent Grant
3534559
Patent number
3,534,559
Issue date
Oct 20, 1970
E21 - EARTH DRILLING MINING
Information
Patent Grant
3512364
Patent number
3,512,364
Issue date
May 19, 1970
E21 - EARTH DRILLING MINING
Information
Patent Grant
3466875
Patent number
3,466,875
Issue date
Sep 16, 1969
E21 - EARTH DRILLING MINING
Information
Patent Grant
3441317
Patent number
3,441,317
Issue date
Apr 29, 1969
E21 - EARTH DRILLING MINING
Information
Patent Grant
3399927
Patent number
3,399,927
Issue date
Sep 3, 1968
E21 - EARTH DRILLING MINING
Information
Patent Grant
3392532
Patent number
3,392,532
Issue date
Jul 16, 1968
E21 - EARTH DRILLING MINING
Information
Patent Grant
3383868
Patent number
3,383,868
Issue date
May 21, 1968
E21 - EARTH DRILLING MINING
Information
Patent Grant
3383866
Patent number
3,383,866
Issue date
May 21, 1968
E21 - EARTH DRILLING MINING
Information
Patent Grant
3376707
Patent number
3,376,707
Issue date
Apr 9, 1968
E21 - EARTH DRILLING MINING
Information
Patent Grant
3333425
Patent number
3,333,425
Issue date
Aug 1, 1967
E21 - EARTH DRILLING MINING
Information
Patent Grant
3320751
Patent number
3,320,751
Issue date
May 23, 1967
E21 - EARTH DRILLING MINING
Information
Patent Grant
3312071
Patent number
3,312,071
Issue date
Apr 4, 1967
E21 - EARTH DRILLING MINING
Information
Patent Grant
3240021
Patent number
3,240,021
Issue date
Mar 15, 1966
E21 - EARTH DRILLING MINING
Information
Patent Grant
3217498
Patent number
3,217,498
Issue date
Nov 16, 1965
E21 - EARTH DRILLING MINING
Information
Patent Grant
3127748
Patent number
3,127,748
Issue date
Apr 7, 1964
E21 - EARTH DRILLING MINING
Information
Patent Grant
2887191
Patent number
2,887,191
Issue date
May 19, 1959
E04 - BUILDING
Information
Patent Grant
2716025
Patent number
2,716,025
Issue date
Aug 23, 1955
E21 - EARTH DRILLING MINING
Information
Patent Grant
2700483
Patent number
2,700,483
Issue date
Jan 25, 1955
B66 - HOISTING LIFTING HAULING
Information
Patent Grant
2373773
Patent number
2,373,773
Issue date
Apr 17, 1945
B64 - AIRCRAFT AVIATION COSMONAUTICS
Information
Patent Grant
2263352
Patent number
2,263,352
Issue date
Nov 18, 1941
E21 - EARTH DRILLING MINING
Information
Patent Grant
2163982
Patent number
2,163,982
Issue date
Jun 27, 1939
B64 - AIRCRAFT AVIATION COSMONAUTICS
Information
Patent Grant
1646417
Patent number
1,646,417
Issue date
Oct 25, 1927
E21 - EARTH DRILLING MINING
Information
Patent Grant
1480733
Patent number
1,480,733
Issue date
Jan 15, 1924
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents