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Classification Resources
 
Class   420ALLOYS OR METALLIC COMPOSITIONS
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[List of Pre Grant Publications for class 420 subclass 1][List of Patents for class 420 subclass 1]1 RADIOACTIVE
[List of Pre Grant Publications for class 420 subclass 8][List of Patents for class 420 subclass 8]8 FERROUS (I.E., IRON BASE)
[List of Pre Grant Publications for class 420 subclass 9][List of Patents for class 420 subclass 9]9 Subclass 9 indent level is 1 1.7 percent or more carbon containing
[List of Pre Grant Publications for class 420 subclass 34][List of Patents for class 420 subclass 34]34 Subclass 34 indent level is 1 Nine percent or more chromium containing
[List of Pre Grant Publications for class 420 subclass 72][List of Patents for class 420 subclass 72]72 Subclass 72 indent level is 1 Eight percent or more manganese containing
[List of Pre Grant Publications for class 420 subclass 77][List of Patents for class 420 subclass 77]77 Subclass 77 indent level is 1 Four percent or more aluminum containing
 [List of Pre Grant Publications for class 420 subclass 82][List of Patents for class 420 subclass 82]82 Subclass 82 indent level is 1 Noble metal containing
 [List of Pre Grant Publications for class 420 subclass 83][List of Patents for class 420 subclass 83]83 Subclass 83 indent level is 1 Rare earth metal containing
[List of Pre Grant Publications for class 420 subclass 84][List of Patents for class 420 subclass 84]84 Subclass 84 indent level is 1 Lead, bismuth, selenium, tellurium or calcium containing
[List of Pre Grant Publications for class 420 subclass 87][List of Patents for class 420 subclass 87]87 Subclass 87 indent level is 1 Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability
[List of Pre Grant Publications for class 420 subclass 89][List of Patents for class 420 subclass 89]89 Subclass 89 indent level is 1 Copper containing
[List of Pre Grant Publications for class 420 subclass 94][List of Patents for class 420 subclass 94]94 Subclass 94 indent level is 1 Over 10 percent nickel containing
[List of Pre Grant Publications for class 420 subclass 99][List of Patents for class 420 subclass 99]99 Subclass 99 indent level is 1 One percent or more carbon containing, but less than 1.7 percent
 [List of Pre Grant Publications for class 420 subclass 103][List of Patents for class 420 subclass 103]103 Subclass 103 indent level is 1 Over 0.1 percent aluminum containing, but less than 4 percent
[List of Pre Grant Publications for class 420 subclass 104][List of Patents for class 420 subclass 104]104 Subclass 104 indent level is 1 Chromium containing, but less than 9 percent
[List of Pre Grant Publications for class 420 subclass 117][List of Patents for class 420 subclass 117]117 Subclass 117 indent level is 1 Two percent or more silicon containing
 [List of Pre Grant Publications for class 420 subclass 119][List of Patents for class 420 subclass 119]119 Subclass 119 indent level is 1 Nickel containing, but 10 percent or less
 [List of Pre Grant Publications for class 420 subclass 120][List of Patents for class 420 subclass 120]120 Subclass 120 indent level is 1 1.5 percent or more manganese containing, but less than 8 percent
 [List of Pre Grant Publications for class 420 subclass 121][List of Patents for class 420 subclass 121]121 Subclass 121 indent level is 1 Boron containing
 [List of Pre Grant Publications for class 420 subclass 122][List of Patents for class 420 subclass 122]122 Subclass 122 indent level is 1 Tungsten containing
[List of Pre Grant Publications for class 420 subclass 123][List of Patents for class 420 subclass 123]123 Subclass 123 indent level is 1 Molybdneum containing
 [List of Pre Grant Publications for class 420 subclass 125][List of Patents for class 420 subclass 125]125 Subclass 125 indent level is 1 Zirconium containing
 [List of Pre Grant Publications for class 420 subclass 126][List of Patents for class 420 subclass 126]126 Subclass 126 indent level is 1 Titanium containing
 [List of Pre Grant Publications for class 420 subclass 127][List of Patents for class 420 subclass 127]127 Subclass 127 indent level is 1 Vanadium, tantalum or niobium containing
 [List of Pre Grant Publications for class 420 subclass 128][List of Patents for class 420 subclass 128]128 Subclass 128 indent level is 1 Nitrogen containinig
 [List of Pre Grant Publications for class 420 subclass 129][List of Patents for class 420 subclass 129]129 Subclass 129 indent level is 1 Processes
 [List of Pre Grant Publications for class 420 subclass 400][List of Patents for class 420 subclass 400]400 ALKALI METAL BASE
 [List of Pre Grant Publications for class 420 subclass 401][List of Patents for class 420 subclass 401]401 BERYLLIUM BASE
[List of Pre Grant Publications for class 420 subclass 402][List of Patents for class 420 subclass 402]402 MAGNESIUM BASE
 [List of Pre Grant Publications for class 420 subclass 415][List of Patents for class 420 subclass 415]415 ALKALINE EARTH METAL BASE
 [List of Pre Grant Publications for class 420 subclass 416][List of Patents for class 420 subclass 416]416 RARE EARTH METAL BASE SINGLY OR IN COMBINATION
[List of Pre Grant Publications for class 420 subclass 417][List of Patents for class 420 subclass 417]417 TITANIUM BASE
[List of Pre Grant Publications for class 420 subclass 422][List of Patents for class 420 subclass 422]422 ZIRCONIUM OR HAFNIUM BASE
 [List of Pre Grant Publications for class 420 subclass 424][List of Patents for class 420 subclass 424]424 VANADIUM BASE
[List of Pre Grant Publications for class 420 subclass 425][List of Patents for class 420 subclass 425]425 NIOBIUM BASE
 [List of Pre Grant Publications for class 420 subclass 427][List of Patents for class 420 subclass 427]427 TANTALUM BASE
 [List of Pre Grant Publications for class 420 subclass 428][List of Patents for class 420 subclass 428]428 CHROMIUM BASE
 [List of Pre Grant Publications for class 420 subclass 429][List of Patents for class 420 subclass 429]429 MOLYBDENUM BASE
[List of Pre Grant Publications for class 420 subclass 430][List of Patents for class 420 subclass 430]430 TUNGSTEN BASE
 [List of Pre Grant Publications for class 420 subclass 433][List of Patents for class 420 subclass 433]433 RHENIUM BASE
 [List of Pre Grant Publications for class 420 subclass 434][List of Patents for class 420 subclass 434]434 MANGANESE BASE
[List of Pre Grant Publications for class 420 subclass 435][List of Patents for class 420 subclass 435]435 COBALT BASE
[List of Pre Grant Publications for class 420 subclass 441][List of Patents for class 420 subclass 441]441 NICKEL BASE
 [List of Pre Grant Publications for class 420 subclass 461][List of Patents for class 420 subclass 461]461 OSMIUM OR IRIDIUM BASE
 [List of Pre Grant Publications for class 420 subclass 462][List of Patents for class 420 subclass 462]462 RUTHENIUM OR RHODIUM BASE
[List of Pre Grant Publications for class 420 subclass 463][List of Patents for class 420 subclass 463]463 PALLADIUM BASE
[List of Pre Grant Publications for class 420 subclass 466][List of Patents for class 420 subclass 466]466 PLATINUM BASE
[List of Pre Grant Publications for class 420 subclass 469][List of Patents for class 420 subclass 469]469 COPPER BASE
[List of Pre Grant Publications for class 420 subclass 501][List of Patents for class 420 subclass 501]501 SILVER BASE
[List of Pre Grant Publications for class 420 subclass 507][List of Patents for class 420 subclass 507]507 GOLD BASE
[List of Pre Grant Publications for class 420 subclass 513][List of Patents for class 420 subclass 513]513 ZINC BASE
 [List of Pre Grant Publications for class 420 subclass 525][List of Patents for class 420 subclass 525]525 CADMIUM BASE
[List of Pre Grant Publications for class 420 subclass 526][List of Patents for class 420 subclass 526]526 MERCURY BASE
[List of Pre Grant Publications for class 420 subclass 528][List of Patents for class 420 subclass 528]528 ALUMINUM BASE
 [List of Pre Grant Publications for class 420 subclass 555][List of Patents for class 420 subclass 555]555 GALLIUM, INDIUM, OR THALLIUM BASE
 [List of Pre Grant Publications for class 420 subclass 556][List of Patents for class 420 subclass 556]556 GERMANIUM BASE
[List of Pre Grant Publications for class 420 subclass 557][List of Patents for class 420 subclass 557]557 TIN BASE
[List of Pre Grant Publications for class 420 subclass 563][List of Patents for class 420 subclass 563]563 LEAD BASE
 [List of Pre Grant Publications for class 420 subclass 576][List of Patents for class 420 subclass 576]576 ANTIMONY BASE
 [List of Pre Grant Publications for class 420 subclass 577][List of Patents for class 420 subclass 577]577 BISMUTH BASE
 [List of Pre Grant Publications for class 420 subclass 578][List of Patents for class 420 subclass 578]578 SILICON BASE ALLOY CONTAINING METAL
 [List of Pre Grant Publications for class 420 subclass 579][List of Patents for class 420 subclass 579]579 ARSENIC BASE OR SELENIUM OR TELLURIUM BASE ALLOY CONTAINING METAL
[List of Pre Grant Publications for class 420 subclass 580][List of Patents for class 420 subclass 580]580 CONTAINING OVER 50 PER CENT METAL BUT NO BASE METAL
 [List of Pre Grant Publications for class 420 subclass 590][List of Patents for class 420 subclass 590]590 PROCESSES
 [List of Pre Grant Publications for class 420 subclass 591][List of Patents for class 420 subclass 591]591 MISCELLANEOUS
 
CROSS-REFERENCE ART COLLECTIONS
 
 [List of Pre Grant Publications for class 420 subclass 900][List of Patents for class 420 subclass 900]900 HYDROGEN STORAGE
 [List of Pre Grant Publications for class 420 subclass 901][List of Patents for class 420 subclass 901]901 SUPERCONDUCTIVE
 [List of Pre Grant Publications for class 420 subclass 902][List of Patents for class 420 subclass 902]902 SUPERPLASTIC
 [List of Pre Grant Publications for class 420 subclass 903][List of Patents for class 420 subclass 903]903 SEMICONDUCTIVE
 
FOREIGN ART COLLECTIONS
 
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