US Patent Class 419
POWDER METALLURGY PROCESSES
 Electronic File Wrappers |  Electronic Patent Documents |  Paper Patent Documents | Current as of: June, 1999
|  and Services |
| Electronic File Wrappers | Electronic Patent Documents | Paper Patent Documents | Current as of: June, 1999
| and Services |
| DF | CLASS NOTES | |
| 1 | DF | POWDER METALLURGY PROCESSES WITH HEATING OR SINTERING |
| 2 | DF | .~ Making porous product |
| 3 | DF | .~ Making articles of indefinite length |
| 4 | DF | .~.~ Filaments or fibers |
| 5 | DF | .~ Making composite or hollow article |
| 6 | DF | .~.~ Powder next to powder |
| 7 | DF | .~.~.~ One or more components not compacted |
| 8 | DF | .~.~ Powder next to solid |
| 9 | DF | .~.~.~ Powder not compacted |
| 10 | DF | .~ Metal and nonmetal in final product |
| 11 | DF | .~.~ Nonmetal is elemental carbon |
| 12 | DF | .~.~ Boride containing |
| 13 | DF | .~.~ Nitride containing |
| 14 | DF | .~.~ Carbide containing |
| 15 | DF | .~.~.~ Complex or multiple carbides |
| 16 | DF | .~.~.~.~ With another binary nonmetal |
| 17 | DF | .~.~.~ Single carbide |
| 18 | DF | .~.~.~.~ Tungsten carbide |
| 19 | DF | .~.~ Oxide containing |
| 20 | DF | .~.~.~ Rare earth oxide |
| 21 | DF | .~.~.~ Silver metal with metal oxide |
| 22 | DF | .~.~.~ Copper oxide |
| 23 | DF | .~ Powder shape or size characteristics |
| 24 | DF | .~.~ Filaments or fibers |
| 25 | DF | .~ Controlled cooling after sintering |
| 26 | DF | .~ Post sintering operation |
| 27 | DF | .~.~ Impregnation |
| 28 | DF | .~.~ Subsequent working |
| 29 | DF | .~.~ Subsequent heat treatment (e.g., annealing, etc.) |
| 30 | DF | .~ Powder pretreatment (prior to consolidation or sintering) |
| 31 | DF | .~.~ Heat treatment of powder |
| 32 | DF | .~.~ Mechanical blending |
| 33 | DF | .~.~ Comminuting |
| 34 | DF | .~.~ Chemical blending |
| 35 | DF | .~.~ Coating |
| 36 | DF | .~.~ Addition of fugitive material |
| 37 | DF | .~.~.~ Additional material is solid |
| 38 | DF | .~ Consolidation of powder prior to sintering |
| 39 | DF | .~.~ Specific pressure or lack or pressure recited |
| 40 | DF | .~.~.~ Slip or slurry |
| 41 | DF | .~.~ Extruding |
| 42 | DF | .~.~ Isostatic or Hydrostatic |
| 43 | DF | .~.~ Rolling |
| 44 | DF | .~ Pretreatment of consolidated powders |
| 45 | DF | .~ Sintering which includes a chemical reaction |
| 46 | DF | .~ Alloying occurs during sintering |
| 47 | DF | .~ Liquid phase sintering |
| 48 | DF | .~ Heat and pressure simultaneously to effect sintering |
| 49 | DF | .~.~ Hot isostatic pressing (HIP) |
| 50 | DF | .~.~ Hot rolling |
| 51 | DF | .~.~ Multiaxial (Not HIP) |
| 52 | DF | .~.~ Heating by electrical means other than radiant energy |
| 53 | DF | .~ Plural heating steps including sintering |
| 54 | DF | .~.~ Different temperatures |
| 55 | DF | .~.~ Additional operation between heating steps |
| 56 | DF | .~ Special medium during sintering |
| 57 | DF | .~.~ Special atmosphere |
| 58 | DF | .~.~.~ Hydrogen or hydrogen plus nitrogen (Nitrogen per se in 57) |
| 59 | DF | .~.~.~ Hydrocarbon or derivative (e.g., CH4, etc.) |
| 60 | DF | .~.~.~ Vacuum |
| 61 | DF | FORMING ARTICLES BY UNITING RANDOMLY ASSOCIATED METAL PARTICLES |
| 62 | DF | .~ Powder pretreatment |
| 63 | DF | .~.~ Includes a chemical reaction |
| 64 | DF | .~.~ Includes coating of particles |
| 65 | DF | .~.~ Includes adding a binder material |
| 66 | DF | .~ Consolidation of powders |
| 67 | DF | .~.~ Extrusion |
| 68 | DF | .~.~ Isostatic/Hydrostatic pressing |
| 69 | DF | .~.~ Rolling |