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Class Number: 419 Class Title: POWDER METALLURGY PROCESSES Subclass Subclass Number Title 1 POWDER METALLURGY PROCESSES WITH HEATING OR SINTERING 2 .Making porous product 3 .Making articles of indefinite length 4 ..Filaments or fibers 5 .Making composite or hollow article 6 ..Powder next to powder 7 ...One or more components not compacted 8 ..Powder next to solid 9 ...Powder not compacted 10 .Metal and nonmetal in final product 11 ..Nonmetal is elemental carbon 12 ..Boride containing 13 ..Nitride containing 14 ..Carbide containing 15 ...Complex or multiple carbides 16 ....With another binary nonmetal 17 ...Single carbide 18 ....Tungsten carbide 19 ..Oxide containing 20 ...Rare earth oxide 21 ...Silver metal with metal oxide 22 ...Copper oxide 23 .Powder shape or size characteristics 24 ..Filaments or fibers 25 .Controlled cooling after sintering 26 .Post sintering operation 27 ..Impregnation 28 ..Subsequent working 29 ..Subsequent heat treatment (e.g., annealing, etc.) 30 .Powder pretreatment (prior to consolidation or sintering) 31 ..Heat treatment of powder 32 ..Mechanical blending 33 ..Comminuting 34 ..Chemical blending 35 ..Coating 36 ..Addition of fugitive material 37 ...Additional material is solid 38 .Consolidation of powder prior to sintering 39 ..Specific pressure or lack or pressure recited 40 ...Slip or slurry 41 ..Extruding 42 ..Isostatic or Hydrostatic 43 ..Rolling 44 .Pretreatment of consolidated powders 45 .Sintering which includes a chemical reaction 46 .Alloying occurs during sintering 47 .Liquid phase sintering 48 .Heat and pressure simultaneously to effect sintering 49 ..Hot isostatic pressing (HIP) 50 ..Hot rolling 51 ..Multiaxial (Not HIP) 52 ..Heating by electrical means other than radiant energyy 53 .Plural heating steps including sintering 54 ..Different temperatures 55 ..Additional operation between heating steps 56 .Special medium during sintering 57 ..Special atmosphere 58 ...Hydrogen or hydrogen plus nitrogen (Nitrogen per se in 57) 59 ...Hydrocarbon or derivative (e.g., CH4, etc.) 60 ...Vacuum 61 FORMING ARTICLES BY UNITING RANDOMLY ASSOCIATED METAL PARTICLES 62 .Powder pretreatment 63 ..Includes a chemical reaction 64 ..Includes coating of particles 65 ..Includes adding a binder material 66 .Consolidation of powders 67 ..Extrusion 68 ..Isostatic/Hydrostatic pressing 69 ..Rolling