US PATENT SUBCLASS 505 / 894
.~.~ Cyclic cryogenic system (e.g., Sterling, Gifford-McMahon, etc.)

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}
894.~.~ Cyclic cryogenic system (e.g., Sterling, Gifford-McMahon, etc.) {1}
895  DF  .~.~.~> With regenerative heat exchanger

DEFINITION

Classification: 505/894

Cyclic cryogenic system (e.g., Sterling, Gifford-McMahon, etc.):

(under subclass 888) Subject matter wherein the heat is removed by means of a generally closed repeating sequence of operations.