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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
| You are viewing a USPC Schedule. |
Class 428 | STOCK MATERIAL OR MISCELLANEOUS ARTICLES |
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| 1.1 | LIQUID CRYSTAL OPTICAL DISPLAY HAVING LAYER OF SPECIFIED COMPOSITION |
| 1.2 | Alignment layer of specified composition |
| 1.21 | Alignment layer is inorganic |
| 1.23 | Silicon compound (i.e., organosilicon) |
| 1.25 | Polyamide |
| 1.26 | Polyimide |
| 1.3 | With viewing layer of specified composition |
| 1.31 | Polarizer or dye containing viewing layer |
| 1.32 | Silicon compound (e.g., glass, organosilicon, etc.) |
| 1.33 | Ester (e.g., polycarbonate, polyacrylate, etc.) |
| 1.4 | With charge transferring layer of specified composition |
| 1.5 | With bonding or intermediate layer of specified composition (e.g., sealant, space, etc.) |
| 1.51 | Inorganic layer |
| 1.52 | Silicon compound (i.e., organosilicon) |
| 1.53 | Epoxy |
| 1.54 | Ester |
| 1.55 | Unsaturated aliphatic polymer (e.g., vinyl, etc.) |
| 1.6 | With substrate layer of specified composition |
| 3 | RELIGIOUS ARTIFACT (E.G., CRUCIFORM, ETC.) |
| 4 | BOW, POMPOM OR ROSETTE |
| 6 | PLUME |
| 7 | SPECIAL OCCASION ORNAMENT |
| 12 | COLLAPSIBLE ARTICLE (E.G., JOINTED, ELASTIC, ETC.) |
| 13 | DISPLAY IN FRAME OR TRANSPARENT CASING; OR DIORAMA INCLUDING OR IMITATIVE OF A REAL OBJECT |
| 15 | THREE DIMENSION IMITATION OR "TREATED" NATURAL PRODUCT |
| 16 | Fauna |
| 17 | Flora |
| 28 | FINIAL OR PENDANT TYPE ARTICLE |
| 29 | ARTICLE HAVING LATENT IMAGE OR TRANSFORMATION |
| 31 | VEHICLE BODY ORNAMENT |
| 800 | MAGNETIC RECORDING COMPONENT OR STOCK |
| 810 | Magnetic head |
| 811 | Magnetoresistive |
| 811.1 | Having tunnel junction effect |
| 811.2 | Multilayer |
| 811.3 | Super lattice (e.g., giant magneto resistance (GMR) or colossal magneto resistance (CMR), etc.) |
| 811.4 | Single film |
| 811.5 | With defined structural feature |
| 812 | Magnetic layer composition |
| 813 | Substrate composition |
| 814 | With protective film |
| 815 | With defined laminate structural detail |
| 816 | With interlaminar component (e.g., adhesion layer, etc.) |
| 817 | Magneto-optical media stock |
| 818 | Multiple magnetic layers, at least one of which is magneto-optic |
| 819 | Unit structure (i.e., three or more differing magnetic layers in series) |
| 819.1 | Reoccurring unit structure |
| 819.2 | Only three adjacent magnetic layers form series |
| 819.3 | Only four or six adjacent magnetic layers form series |
| 820 | Only two magnetic layers, at least one of which is magneto-optic |
| 821 | Single magneto-optic magnetic layer |
| 822 | Magneto-optic magnetic layer contains transition metal |
| 822.1 | Magnetic transition metal oxide in magneto-optic layer |
| 822.3 | Rare-earth or lanthanum series element with iron or cobalt or nickel |
| 823 | With nonmagnetic metal (e.g., antiferromagnetic metal layer, Cu layer, etc.) |
| 824 | With dielectric layer (e.g., SiO, AIN, ZnS, MgF2, etc.) |
| 824.1 | Plural dielectric layers or sections |
| 824.2 | Plural compounds in single dielectric layer (e.g., mixed layer of TiN and TiC, etc.) |
| 824.3 | Dielectric layer having chalcogen (i.e., O, S, Se, or Te) compound |
| 824.4 | Dielectric layer having nitride or carbide compound (e.g., TiN, TiC, etc.) |
| 824.5 | Dielectric layer having refractive index specified |
| 825 | With topcoat |
| 826 | Thin film media |
| 827 | Multiple magnetic layers |
| 828 | Magnetic layers separated by nonmagnetic (antiferromagnetic, Cu, dielectric, etc.) layer(s) |
| 829 | Differing compositions in plurality of magnetic layers (e.g., layer compositions having differing elemental components, different proportions of elements, etc.) |
| 830 | Plural magnetic layers of same empirical composition, each with different structure (e.g., differing crystalline lattice, atomic structure, etc.) |
| 831 | Single magnetic layer having two or more nonmagnetic underlayers (e.g., seed layers, barrier layers, etc.) |