| Class 420 | ALLOYS OR METALLIC COMPOSITIONS |
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![[List of Pre Grant Publications for class 420 subclass 1]](../as.gif) | ![[List of Patents for class 420 subclass 1]](../ps.gif) | 1 | RADIOACTIVE |
| | 2 |  Actinide base; singly or in combination |
| | 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 |
| | 13 | 2.7 percent or more carbon equivalent containing (i.e., cast iron) |
| | 14 |  Boron containing |
| | 15 | Chromium 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 |
| | 34 | Nine percent or more chromium containing |
| | 35 | Noble metal containing |
| | 36 | Cobalt 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 |
| | 48 | Group IV or V transition metal containing |
| | 49 | Copper containing |
| | 50 | Over 1.5 percent silicon containing |
| | 52 | Molybdenum 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 |
| | 60 | Copper containing |
| | 62 | Over 0.1 percent aluminum containing |
| | 64 | Boron containing |
| | 65 | 0.25 percent or more nitrogen containing |
| | 67 | Molybdenum or tungsten containing |
| | 70 | Group IV or V transition metal containing |
| | 71 | Processes |
| | 72 | Eight percent or more manganese 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 |
| | 87 | Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability |
| | 89 | Copper containing |
| | 90 | Chromium 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 |
| | 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 |
| | 110 | Titanium, zirconium or niobium containing |
| | 111 | Vanadium containing |
| | 112 | Nickel containing |
| | 114 | Tungsten containing |
| | 115 | Processes |
| | 117 | Two percent or more silicon 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 |
| | 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 |
| | 405 | Lanthanide containing |
| | 407 | Aluminum containing |
| | 411 | Zinc containing |
| | 413 | Manganese containing |
| | 414 | Zirconium containing |
| | 415 | ALKALINE EARTH METAL BASE |
| | 416 | RARE EARTH METAL BASE SINGLY OR IN COMBINATION |
| | 417 | TITANIUM BASE |
| | 422 | ZIRCONIUM OR HAFNIUM BASE |
| | 424 | VANADIUM BASE |
| | 425 | NIOBIUM BASE |
| | 427 | TANTALUM BASE |
| | 428 | CHROMIUM BASE |
| | 429 | MOLYBDENUM BASE |
| | 430 | TUNGSTEN BASE |
| | 433 | RHENIUM BASE |
| | 434 | MANGANESE BASE |
| | 435 | COBALT BASE |
| | 441 | NICKEL BASE |
| | 442 | Chromium containing |
| | 443 | Rare earth, magnesium or alkaline earth metal containing |
| | 444 | Noble metal containing |
| | 445 | Aluminum containing |
| | 451 | Titanium containing |
| | 452 | Iron or manganese containing |
| | 455 | Rare earth containing |
| | 456 | Noble metal containing |
| | 457 | Copper containing |
| | 459 | Iron or manganese containing |
| | 460 | Aluminum containing |
| | 461 | OSMIUM OR IRIDIUM BASE |
| | 462 | RUTHENIUM OR RHODIUM BASE |
| | 463 | PALLADIUM BASE |
| | 466 | PLATINUM BASE |
| | 469 | COPPER BASE |
| | 470 | Tin containing |
| | 471 | Aluminum containing |
| | 472 | Phosphorus containing |
| | 473 | Iron, manganese or nickel containing |
| | 474 | Lead containing |
| | 476 | Zinc containing |
| | 477 | Zinc containing |
| | 478 | Aluminum containing |
| | 481 | Nickel containing |
| | 482 | Manganese containing |
| | 483 | Noble metal containing |
| | 484 | Refractory metal containing |
| | 485 | Nickel 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 |
| | 507 | GOLD BASE |
| | 508 | Palladium containing |
| | 510 | Platinum containing |
| | 511 | Silver containing |
| | 512 | Iron, cobalt, or nickel containing |
| | 513 | ZINC BASE |
| | 514 | Aluminum containing |
| | 521 | Copper containing |
| | 523 | Cadmium containing |
| | 524 | Tin containing |
| | 525 | CADMIUM BASE |
| | 526 | MERCURY BASE |
| | 528 | ALUMINUM BASE |
| | 529 | Copper containing |
| | 530 | Tin containing |
| | 531 | Zinc containing |
| | 533 | Magnesium containing |
| | 537 | Silicon containing |
| | 538 | Iron, cobalt, or nickel containing |
| | 539 | Silver containing |
| | 540 | Zinc containing |
| | 542 | Magnesium containing |
| | 543 | Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing |
| | 546 | Silicon containing |
| | 547 | Iron, cobalt, or nickel containing |
| | 548 | Silicon containing |
| | 550 | Iron, cobalt, or nickel containing |
| | 552 | Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing |
| | 554 | Cadmium, lead, or bismuth containing |
| | 555 | GALLIUM, INDIUM, OR THALLIUM BASE |
| | 556 | GERMANIUM BASE |
| | 557 | TIN BASE |
| | 563 | LEAD BASE |
| | 564 | Alkali, alkaline earth metal or magnesium containing |
| | 566 | Silver containing |
| | 567 | Arsenic containing |
| | 570 | Tin 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 |
| | 587 | Copper containing |
| | 588 | Chromium containing |
| | 589 | Tin containing |
| | 590 | PROCESSES |
| | 591 | MISCELLANEOUS |
| CROSS-REFERENCE ART COLLECTIONS | ||
| | 900 | HYDROGEN STORAGE |
| | 901 | SUPERCONDUCTIVE |
| | 902 | SUPERPLASTIC |
| | 903 | SEMICONDUCTIVE |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |