US PATENT SUBCLASS 505 / 898
.~.~ Cryogenic envelope

Current as of: June, 1999
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505 /   HD   SUPERCONDUCTOR TECHNOLOGY: APPARATUS, MATERIAL, PROCESS

825  DF  APPARATUS, PER SE, DEVICE, PER SE, OR PROCESS OF MAKING OR OPERATING SAME {36}
888  DF  .~ Refrigeration: (Class 62) {9}
898.~.~ Cryogenic envelope

DEFINITION

Classification: 505/898

Cryogenic envelope:

(under subclass 888) Subject matter including structure or housing for preserving or maintaining a very low temperature.