Tail packing for a slurry pressurized shield
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United States of America Patent
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-
Jun 24, 1980
Grant Date -
N/A
app pub date -
Feb 21, 1978
filing date -
Feb 21, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tail packing for a slurry pressurized shield is provided, comprising outer layers of strings and a filter element layer between the outer layers. The outer layers are composed of a number of strings densely arranged in a juxtaposed relation.
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- Non-US Classification not provided for expired patents
Cited Art Landscape
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