US PATENT SUBCLASS 252 / 301.18
.~.~ Heavy metal containing

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

301.16  DF  ORGANIC LUMINESCENT MATERIAL CONTAINING COMPOSITIONS {6}
301.17  DF  .~ Scintillating or lasing compositions {1}
301.18.~.~ Heavy metal containing

DEFINITION

Classification: 252/301.18

(under subclass 301.17) Compositions which contain a metal

having a specific gravity greater than four.