US PATENT SUBCLASS 505 / 820
.~.~.~ And etching

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

800  DF  MATERIAL, PER SE, PROCESS OF MAKING SAME {4}
815  DF  .~ Process of making, per se {5}
818  DF  .~.~ Coating: (Classes 204, 427/62) {3}
820.~.~.~ And etching

DEFINITION

Classification: 505/820

And etching:

(under subclass 818) Subject matter involving removal of material from a substrate.