US Patent Class 521
SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES-- Main Headings



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Current as of: June, 1999
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CLASS NOTES
*  DF  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
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CROSS-REFERENCE ART COLLECTIONS
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901  DF  CELLULAR POLYMER CONTAINING A CARBODIIMIDE STRUCTURE
902  DF  CELLULAR POLYMER CONTAINING AN ISOCYANURATE STRUCTURE
903  DF  CELLULAR POLYMER HAVING REDUCED SMOKE OR GAS GENERATION
904  DF  POLYURETHANE CELLULAR PRODUCT HAVING HIGH RESILIENCY OR COLD CURE PROPERTY
905  DF  HYDROPHILIC OR HYDROPHOBIC CELLULAR PRODUCT
906  DF  POLYURETHANE CELLULAR PRODUCT CONTAINING UNREACTED FLAME-RETARDANT MATERIAL
907  DF  NONURETHANE FLAMEPROOFED CELLULAR PRODUCT
908  DF  NUCLEATING AGENT FOR CELLULAR PRODUCT
909  DF  BLOWING-AGENT MODERATOR, E.G., KICKERS, ETC.
910  DF  PLURAL BLOWING AGENTS FOR PRODUCING NONPOLYURETHANE CELLULAR PRODUCTS
911  DF  SURFACTANT FOR OTHER THAN POLYURETHANE CELLULAR PRODUCT
912  DF  SEPARATED REACTIVE MATERIALS UTILIZED IN PREPARING CELLULAR PRODUCT
913  DF  CELL FORMING IN ABSENCE OF EXTERNAL HEAT
914  DF  POLYURETHANE CELLULAR PRODUCT FORMED FROM A POLYOL WHICH HAS BEEN DERIVED FROM AT LEAST TWO 1,2 EPOXIDES AS REACTANTS
915  DF  UTILIZING ELECTRICAL OR WAVE ENERGY DURING CELL FORMING PROCESS
916  DF  CELLULAR PRODUCT HAVING ENHANCED DEGRADABILITY
917  DF  SPECIALIZED MIXING APPARATUS UTILIZED IN CELL FORMING PROCESS
918  DF  PHYSICAL AFTERTREATMENT OF A CELLULAR PRODUCT
919  DF  SINTERED PRODUCT
920  DF  CELLULAR PRODUCT CONTAINING A DYE OR PIGMENT
921  DF  PREPARING A NONPOLYURETHANE CELLULAR PARTICLE FROM A NONPARTICULATE MATERIAL