Process and installation for the congelation of grounds by means of a cryogenic liquid
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 30, 1987
Grant Date -
N/A
app pub date -
May 29, 1985
filing date -
Jun 1, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The injection of liquid nitrogen into the probe (2) is regulated in an on-off manner so as to maintain the temperature of the ground at the coldest point above a value within the range of between -140.degree. C. and -160.degree. C. so as to cause calefaction of the liquid nitrogen. The liquid nitrogen is alternately injected into the central passage (9) and into the annular passage (11) of the probe, these passages being thermally insulated from each other.
First Claim
Family
International Classification(s)
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