Manual of U.S. Patent Classification
as of June 30, 2000

Class
420
ALLOYS OR METALLIC COMPOSITIONS

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

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For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> ALLOYS OR METALLIC COMPOSITIONS
1		RADIOACTIVE
2		. Actinide base; singly or in combination
3		. . Uranium base
4		. Iron base
5		. Magnesium base
6		. Nickel or cobalt base
7		. Aluminum base
8		FERROUS (I.E., IRON BASE)
9		. 1.7 percent or more carbon containing
10		. . Six percent or more total group IV, V or VI transition metals containing
11		. . . Eight percent or more chromium containing
12		. . . . Molybdenum, tungsten or vanadium containing
13		. . 2.7 percent or more carbon equivalent containing (i.e., cast iron)
14		. . . Boron containing
15		. . . Chromium containing
16		. . . . Nickel containing
17		. . . . . Molybdenum containing
18		. . . Processes of adding magnesium
19		. . . . Adding magnesium as a liquid, vapor or as a solid agent entrained by gas (e.g., fluidized)
20		. . . . Flowing molten iron alloy onto solid magnesium containing agent, or adding solid magnesium containing agent to molten stream of iron alloy
21		. . . . Mechanically plunging magnesium containing agent below surface of iron alloy melt
22		. . . . Separate addition of plural agents, at least one containing magnesium
23		. . . . Magnesium containing agent is coated, impregnated, or compacted (e.g., briquetted, coated particles)
24		. . . . Magnesium present in agent only as a compound with a nonmetal
25		. . . . In agent also containing silicon, rare earth, or alkaline earth metal
26		. . . Copper containing
27		. . . Nickel or molybdenum containing
28		. . . Over .1 percent aluminum containing
29		. . . Processes
30		. . . . Adding rare earth or alkaline earth metal
31		. . . . Adding sulfur, selenium or tellurium
32		. . . . Adding vanadium, titanium, niobium, or zirconium
33		. . . . Adding silicon
34		. Nine percent or more chromium containing
35		. . Noble metal containing
36		. . Cobalt containing
37		. . . Molybdenum or tungsten containing
38		. . . . Nickel containing
39		. . . . Copper containing
40		. . Rare earth containing
41		. . Lead, bismuth, antimony, calcium, selenium or tellurium containing
42		. . Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability
43		. . Eight percent or more nickel containing
44		. . . Over 2 percent manganese containing
45		. . . . Copper containing
46		. . . . Molybdenum or tungsten containing
47		. . . . . Group IV or V transition metal containing
48		. . . . Group IV or V transition metal containing
49		. . . Copper containing
50		. . . Over 1.5 percent silicon containing
51		. . . . Group IV or V transition metal containing
52		. . . Molybdenum containing
53		. . . . Group IV or V transition metal containing
54		. . . Group IV or V transition metal containing
55		. . . Over 0.1 percent carbon containing
56		. . Eight percent or more total nickel plus manganese containing
57		. . . Molybdenum or tungsten containing
58		. . . Copper containing
59		. . . Over 0.20 percent nitrogen containing
60		. . Copper containing
61		. . . Molybdenum or tungsten containing
62		. . Over 0.1 percent aluminum containing
63		. . . Molybdenum or tungsten conaining
64		. . Boron containing
65		. . 0.25 percent or more nitrogen containing
66		. . . Group IV or V transition metal containing
67		. . Molybdenum or tungsten containing
68		. . . Titanium, zirconium or hafnium containing
69		. . . Vanadium, niobium or tantalum containing
70		. . Group IV or V transition metal containing
71		. . Processes
72		. Eight percent or more manganese containing
73		. . Nickel containing
74		. . Chromium containing
75		. . Titanium containing
76		. . Copper containing
77		. Four percent or more aluminum containing
78		. . Over 2 percent silicon containing
79		. . Chromium containing
80		. . Nickel or cobalt containing
81		. . Zirconium, vanadium or titanium containing
82		. Noble metal containing
83		. Rare earth metal containing
84		. Lead, bismuth, selenium, tellurium or calcium containing
85		. . Processes
86		. . . Adding lead
87		. Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability
88		. . Processes of making or treating alloy containing over 0.04 percent phosphorus
89		. Copper containing
90		. . Chromium containing
91		. . . Nickel containing
92		. . Nickel containing
93		. . Vanadium, zirconium, titanium or molybdenum containing
94		. Over 10 percent nickel containing
95		. . Cobalt containing
96		. . Molybdenum containing
97		. . Chromium containing
98		. . Over 1 percent silicon containing
99		. One percent or more carbon containing, but less than 1.7 percent
100		. . Chromium containing
101		. . . Molybdenum containing
102		. . . . Cobalt containing
103		. Over 0.1 percent aluminum containing, but less than 4 percent
104		. Chromium containing, but less than 9 percent
105		. . Molybdenum containing
106		. . . Boron or beryllium containing
107		. . . Cobalt containing
108		. . . Nickel containing
109		. . . . Vanadium, titanium or zirconium containing
110		. . . Titanium, zirconium or niobium containing
111		. . . Vanadium containing
112		. . Nickel containing
113		. . . Tungsten containing
114		. . Tungsten containing
115		. . Processes
116		. . . Including reducing a chromium compound
117		. Two percent or more silicon containing
118		. . Titanium, molybdenum, tungsten or vanadium containing
119		. Nickel containing, but 10 percent or less
120		. 1.5 percent or more manganese containing, but less than 8 percent
121		. Boron containing
122		. Tungsten containing
123		. Molybdneum containing
124		. . Vanadium, tantalum or titanium containing
125		. Zirconium containing
126		. Titanium containing
127		. Vanadium, tantalum or niobium containing
128		. Nitrogen containinig
129		. Processes
400		ALKALI METAL BASE
401		BERYLLIUM BASE
402		MAGNESIUM BASE
403		. Silver containing
404		. . Manganese containing
405		. Lanthanide containing
406		. . Zirconium containing
407		. Aluminum containing
408		. . Zinc containing
409		. . . Manganese containing
410		. . Manganese containing
411		. Zinc containing
412		. . Manganese containing
413		. Manganese containing
414		. Zirconium containing
415		ALKALINE EARTH METAL BASE
416		RARE EARTH METAL BASE SINGLY OR IN COMBINATION
417		TITANIUM BASE
418		. Aluminum containing
419		. . Tin containing
420		. . Vanadium containing
421		. Chromium or molybdenum containing
422		ZIRCONIUM OR HAFNIUM BASE
423		. Copper containing
424		VANADIUM BASE
425		NIOBIUM BASE
426		. Titanium, zirconium, or hafnium containing
427		TANTALUM BASE
428		CHROMIUM BASE
429		MOLYBDENUM BASE
430		TUNGSTEN BASE
431		. Carbon, boron or nitrogen containing
432		. Rhenium or noble metal containing
433		RHENIUM BASE
434		MANGANESE BASE
435		COBALT BASE
436		. Chromium containing
437		. . Aluminum containing
438		. . . Titanium containing
439		. . Titanium containing
440		. . Iron containing
441		NICKEL BASE
442		. Chromium containing
443		. . Rare earth, magnesium or alkaline earth metal containing
444		. . Noble metal containing
445		. . Aluminum containing
446		. . . Titanium containing
447		. . . . Tantalum, niobium, vanadium, or hafnium containing
448		. . . . . Molybdenum or tungsten containing
449		. . . . Zirconium or boron containing
450		. . . . Molybdenum or tungsten containing
451		. . Titanium containing
452		. . Iron or manganese containing
453		. . . Molybdenum or tungsten containing
454		. . . . Cobalt containing
455		. Rare earth containing
456		. Noble metal containing
457		. Copper containing
458		. . Iron containing
459		. Iron or manganese containing
460		. Aluminum containing
461		OSMIUM OR IRIDIUM BASE
462		RUTHENIUM OR RHODIUM BASE
463		PALLADIUM BASE
464		. Copper containing
465		. Platinum containing
466		PLATINUM BASE
467		. Rhodium containing
468		. Nickel containing
469		COPPER BASE
470		. Tin containing
471		. . Aluminum containing
472		. . Phosphorus containing
473		. . Iron, manganese or nickel containing
474		. . Lead containing
475		. . . Zinc containing
476		. . Zinc containing
477		. Zinc containing
478		. . Aluminum containing
479		. . . Nickel containing
480		. . . Manganese containing
481		. . Nickel containing
482		. . Manganese containing
483		. . Noble metal containing
484		. . Refractory metal containing
485		. Nickel containing
486		. . Aluminum containing
487		. . Iron or manganese containing
488		. . Refractory metal containing
489		. Aluminum, gallium, indium, or thallium containing
490		. Silicon containing
491		. Lead containing
492		. Titanium, zirconium or hafnium containing
493		. Manganese containing
494		. Beryllium, magnesium, or alkaline earth metal containing
495		. Other refractory metal containing
496		. Iron or cobalt containing
497		. Noble metal containing
498		. Cadmium, or mercury containing
499		. Phosphorus, arsenic, antimony, or bismuth containing
500		. Sulfur, selenium, or tellurium containing
501		SILVER BASE
502		. Copper containing
503		. . Other noble metal containing
504		. . Zinc, or cadmium containing
505		. Other noble metal containing
506		. Zinc, or cadmium containing
507		GOLD BASE
508		. Palladium containing
509		. . Platinum containing
510		. Platinum containing
511		. Silver containing
512		. Iron, cobalt, or nickel containing
513		ZINC BASE
514		. Aluminum containing
515		. . Copper containing
516		. . . Mangesium containing
517		. . . Tin containing
518		. . . Manganese, iron, cobalt, or nickel containing
519		. . Magnesium containing
520		. . Manganese, iron, cobalt, or nickel containing
521		. Copper containing
522		. . Manganese, iron, cobalt, or nickel containing
523		. Cadmium containing
524		. Tin containing
525		CADMIUM BASE
526		MERCURY BASE
527		. Silver containing
528		ALUMINUM BASE
529		. Copper containing
530		. . Tin containing
531		. . Zinc containing
532		. . . Magnesium containing
533		. . Magnesium containing
534		. . . Silicon containing
535		. . . . Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing
536		. . . . Cadmium, lead or bismuth containing
537		. . Silicon containing
538		. . Iron, cobalt, or nickel containing
539		. . Silver containing
540		. Zinc containing
541		. . Magnesium containing
542		. Magnesium containing
543		. . Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing
544		. . . Silicon containing
545		. . . Chromium containing
546		. . Silicon containing
547		. . Iron, cobalt, or nickel containing
548		. Silicon containing
549		. . Alkali, or alkaline earth metal containing
550		. Iron, cobalt, or nickel containing
551		. . Titanium, zirconium, hafnium, vanadium, noobium or tantalum containing
552		. Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing
553		. . Manganese containing
554		. Cadmium, lead, or bismuth containing
555		GALLIUM, INDIUM, OR THALLIUM BASE
556		GERMANIUM BASE
557		TIN BASE
558		. Lead containing
559		. . Antimony, or bismuth containing
560		. Copper containing
561		. . Antimony, or bismuth containing
562		. Antimony, or bismuth containing
563		LEAD BASE
564		. Alkali, alkaline earth metal or magnesium containing
565		. . Tin containing
566		. Silver containing
567		. Arsenic containing
568		. . Tin containing
569		. . . Antimony containing
570		. Tin containing
571		. . Antimony containing
572		. Antimony containing
573		. Copper containing
574		. Zinc containing
575		. Cadmium containing
576		ANTIMONY BASE
577		BISMUTH BASE
578		SILICON BASE ALLOY CONTAINING METAL
579		ARSENIC BASE OR SELENIUM OR TELLURIUM BASE ALLOY CONTAINING METAL
580		CONTAINING OVER 50 PER CENT METAL BUT NO BASE METAL
581		. Iron containing
582		. . Copper containing
583		. . Chromium containing
584.1		. . . Nickel containing
585		. . . . Cobalt containing
586		. . . . . Titanium, or zirconium containing
586.1		. . . . Molybdenum containing
587		. Copper containing
588		. Chromium containing
589		. Tin containing
590		PROCESSES
591		MISCELLANEOUS
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		CROSS-REFERENCE ART COLLECTIONS
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900		HYDROGEN STORAGE
901		SUPERCONDUCTIVE
902		SUPERPLASTIC
903		SEMICONDUCTIVE

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Last Modified: 6 October 2000