Suction of gases from boreholes in coal mining
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 30, 1982
Grant Date -
N/A
app pub date -
Jul 18, 1980
filing date -
Jul 21, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Gas, particularly methane, is sucked from a borehole (B) extending from a coal mine working by means of a casing consisting of tubular plastics sections (8) by means of a vacuum pump connected to the lower end of the casing. The casing is sealed to the borehole by a sliding seal (2) which allows the casing to be moved up and down the borehole until the upper end of the casing is at the level of the maximum yield of gas. The annular space between the casing and borehole wall is then filled with a liquid which expands and sets to form a polyurethane foam (4).
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully