US Patent Class 420-- ALLOYS OR METALLIC COMPOSITIONS-- MAIN HEADINGS

US Patent Class 420
ALLOYS OR METALLIC COMPOSITIONS-- Main Headings

		CLASS NOTES
1	DF	RADIOACTIVE {5}
8	DF	FERROUS (I.E., IRON BASE) {24}
400	DF	ALKALI METAL BASE
401	DF	BERYLLIUM BASE
402	DF	MAGNESIUM BASE {6}
415	DF	ALKALINE EARTH METAL BASE
416	DF	RARE EARTH METAL BASE SINGLY OR IN COMBINATION
417	DF	TITANIUM BASE {2}
422	DF	ZIRCONIUM OR HAFNIUM BASE {1}
424	DF	VANADIUM BASE
425	DF	NIOBIUM BASE {1}
427	DF	TANTALUM BASE
428	DF	CHROMIUM BASE
429	DF	MOLYBDENUM BASE
430	DF	TUNGSTEN BASE {2}
433	DF	RHENIUM BASE
434	DF	MANGANESE BASE
435	DF	COBALT BASE {1}
441	DF	NICKEL BASE {6}
461	DF	OSMIUM OR IRIDIUM BASE
462	DF	RUTHENIUM OR RHODIUM BASE
463	DF	PALLADIUM BASE {2}
466	DF	PLATINUM BASE {2}
469	DF	COPPER BASE {15}
501	DF	SILVER BASE {3}
507	DF	GOLD BASE {4}
513	DF	ZINC BASE {4}
525	DF	CADMIUM BASE
526	DF	MERCURY BASE {1}
528	DF	ALUMINUM BASE {7}
555	DF	GALLIUM, INDIUM, OR THALLIUM BASE
556	DF	GERMANIUM BASE
557	DF	TIN BASE {3}
563	DF	LEAD BASE {8}
576	DF	ANTIMONY BASE
577	DF	BISMUTH BASE
578	DF	SILICON BASE ALLOY CONTAINING METAL
579	DF	ARSENIC BASE OR SELENIUM OR TELLURIUM BASE ALLOY CONTAINING METAL
580	DF	CONTAINING OVER 50 PER CENT METAL BUT NO BASE METAL {4}
590	DF	PROCESSES
591	DF	MISCELLANEOUS
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		CROSS-REFERENCE ART COLLECTIONS
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900	DF	HYDROGEN STORAGE
901	DF	SUPERCONDUCTIVE
902	DF	SUPERPLASTIC
903	DF	SEMICONDUCTIVE