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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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| 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 pe |
