.~ Solidification, vitrification, or cementation {4}
253
.~.~ In situ vitrification
DEFINITION
Classification: 588/253
In situ vitrification:
(under subclass 252) Processes whereby the melting or sintering to form a glass or glass like substance is done underground.
(1) Note. Included herein is any process that produces the necessary conditions for the melting or sintering of a substance to form a glassy mass under the surface of the earth.