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Class   521SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
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This Class 521 is considered to be an integral part of Class 520 (see the Class 520 schedule for the position of this Class in schedule hierarchy). This Class retains all pertinent definitions and class lines of Class 520
     SYNTHETIC RESINS (CLASS 520, SUBCLASS 1)
[List of Pre Grant Publications for class 521 subclass 25][List of Patents for class 521 subclass 25]25 Subclass 25 indent level is 1 ION-EXCHANGE POLYMER OR PROCESS OF PREPARING
 [List of Pre Grant Publications for class 521 subclass 26][List of Patents for class 521 subclass 26]26 Subclass 26 indent level is 2 Process of regenerating
 [List of Pre Grant Publications for class 521 subclass 27][List of Patents for class 521 subclass 27]27 Subclass 27 indent level is 2 Membrane or process of preparing
 [List of Pre Grant Publications for class 521 subclass 28][List of Patents for class 521 subclass 28]28 Subclass 28 indent level is 2 Previously formed solid ion-exchange polymer admixed with nonreactive material or ion-exchange polymer
 [List of Pre Grant Publications for class 521 subclass 29][List of Patents for class 521 subclass 29]29 Subclass 29 indent level is 2 Polymer characterized by defined size or shape other than bead or pearl
[List of Pre Grant Publications for class 521 subclass 30][List of Patents for class 521 subclass 30]30 Subclass 30 indent level is 2 Chemically treated solid polymer
 [List of Pre Grant Publications for class 521 subclass 38][List of Patents for class 521 subclass 38]38 Subclass 38 indent level is 2 From ethylenically unsaturated reactant only
 [List of Pre Grant Publications for class 521 subclass 39][List of Patents for class 521 subclass 39]39 Subclass 39 indent level is 2 From aldehyde or derivative
[List of Pre Grant Publications for class 521 subclass 40][List of Patents for class 521 subclass 40]40 Subclass 40 indent level is 1 PROCESS OF TREATING SCRAP OR WASTE PRODUCT CONTAINING SOLID ORGANIC POLYMER TO RECOVER A SOLID POLYMER THEREFROM
[List of Pre Grant Publications for class 521 subclass 40.5][List of Patents for class 521 subclass 40.5]40.5 Subclass 40.5 indent level is 2 Process of treating scrap or waste product containing at least one polymer derived from ethylenic unsaturated monomers only
 [List of Pre Grant Publications for class 521 subclass 47.5][List of Patents for class 521 subclass 47.5]47.5 Subclass 47.5 indent level is 2 Treating polysiloxane
[List of Pre Grant Publications for class 521 subclass 48][List of Patents for class 521 subclass 48]48 Subclass 48 indent level is 2 Treating polyester
[List of Pre Grant Publications for class 521 subclass 49][List of Patents for class 521 subclass 49]49 Subclass 49 indent level is 2 Treating polyurethane, polyurea (excluding urea-formaldehyde polymers), polyisocyanurate or polycarbodiimide
 [List of Pre Grant Publications for class 521 subclass 49.8][List of Patents for class 521 subclass 49.8]49.8 Subclass 49.8 indent level is 2 Treating polycarbonamide
[List of Pre Grant Publications for class 521 subclass 50][List of Patents for class 521 subclass 50]50 Subclass 50 indent level is 1 CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC.
 [List of Pre Grant Publications for class 521 subclass 50.5][List of Patents for class 521 subclass 50.5]50.5 Subclass 50.5 indent level is 2 Compositions to be polymerized by wave energy in order to prepare a cellular product wherein said composition contains a rate-affecting material; or compositions to be modified by wave energy to prepare a cellular product wherein said composition contains a rate-affecting material; or processes of preparing or treating a solid polymer utilizing wave energy in order to prepare a cellular product
 [List of Pre Grant Publications for class 521 subclass 51][List of Patents for class 521 subclass 51]51 Subclass 51 indent level is 2 Processes of preparing a cellular product having an integral skin
 [List of Pre Grant Publications for class 521 subclass 52][List of Patents for class 521 subclass 52]52 Subclass 52 indent level is 2 Reticulated cellular product or processes of preparing a reticulated cellular product
[List of Pre Grant Publications for class 521 subclass 53][List of Patents for class 521 subclass 53]53 Subclass 53 indent level is 2 Treating a cellular solid polymer by adding a material thereto which reacts with the polymer or forms a composition therewith, or products of said treating process
[List of Pre Grant Publications for class 521 subclass 56][List of Patents for class 521 subclass 56]56 Subclass 56 indent level is 2 Particle which is expandible, process of preparing an expandible particle, or process of expanding a particle to form a cellular product
[List of Pre Grant Publications for class 521 subclass 61][List of Patents for class 521 subclass 61]61 Subclass 61 indent level is 2 Process of preparing a cellular product by removal of material from a solid polymer-containing matrix without expanding the matrix; composition which is nonexpandible and is designed to form a cellular product by said process; or process of preparing said composition
[List of Pre Grant Publications for class 521 subclass 65][List of Patents for class 521 subclass 65]65 Subclass 65 indent level is 2 Process of forming a cellular product from an aqueous latex, aqueous dispersion, or aqueous emulsion containing a solid polymer; process of preparing a latex, dispersion, or emulsion containing a solid polymer which is designed to be formed into a cellular product, or composition thereof
[List of Pre Grant Publications for class 521 subclass 73][List of Patents for class 521 subclass 73]73 Subclass 73 indent level is 2 Process of preparing a cellular product of a plastisol of a solid polymer derived solely from ethylenically unsaturated monomers; forming a plastisol of a solid polymer derived solely from an ethylenically unsaturated monomer which is designed to be formed into a cellular product, or composition thereof
 [List of Pre Grant Publications for class 521 subclass 76][List of Patents for class 521 subclass 76]76 Subclass 76 indent level is 2 Preparing a cellular product utilizing a stated ingredient which is surface coated or is a discrete solid particle containing a fluid encapsulated therein, processes of forming an expandible composition, containing said stated ingredient or composition therefrom
 [List of Pre Grant Publications for class 521 subclass 77][List of Patents for class 521 subclass 77]77 Subclass 77 indent level is 2 Preparing a cellular product by decomposition of a solid polymer; or process of forming a composition containing a solid polymer which decomposes so as to subsequently form a cellular polymer, or composition therefrom
 [List of Pre Grant Publications for class 521 subclass 78][List of Patents for class 521 subclass 78]78 Subclass 78 indent level is 2 Preparing a cellular product by spraying a solid polymer containing material
[List of Pre Grant Publications for class 521 subclass 79][List of Patents for class 521 subclass 79]79 Subclass 79 indent level is 2 Extruding a solid polymer containing material to form a cellular product
[List of Pre Grant Publications for class 521 subclass 82][List of Patents for class 521 subclass 82]82 Subclass 82 indent level is 2 Process of forming a cellular product subsequent to solid polymer formation in the presence of a stated ingredient, noncellular composition capable of forming a cellular product and containing a stated ingredient, or process of preparing same
[List of Pre Grant Publications for class 521 subclass 99][List of Patents for class 521 subclass 99]99 Subclass 99 indent level is 2 Cellular product formation prior to or during solid polymer formation in the presence of a stated ingredient other than water
 [List of Pre Grant Publications for class 521 subclass 100][List of Patents for class 521 subclass 100]100 Subclass 100 indent level is 3 Ingredient is water settable inorganic composition
 [List of Pre Grant Publications for class 521 subclass 101][List of Patents for class 521 subclass 101]101 Subclass 101 indent level is 3 Ingredient is bituminous or asphaltic material
 [List of Pre Grant Publications for class 521 subclass 102][List of Patents for class 521 subclass 102]102 Subclass 102 indent level is 3 Ingredient is a protein containing material
[List of Pre Grant Publications for class 521 subclass 103][List of Patents for class 521 subclass 103]103 Subclass 103 indent level is 3 Ingredient contains a boron atom
[List of Pre Grant Publications for class 521 subclass 106][List of Patents for class 521 subclass 106]106 Subclass 106 indent level is 3 Ingredient contains a phosphorus atom
 [List of Pre Grant Publications for class 521 subclass 109.1][List of Patents for class 521 subclass 109.1]109.1 Subclass 109.1 indent level is 3 Ingredient is carbohydrate, or natural resin
[List of Pre Grant Publications for class 521 subclass 110][List of Patents for class 521 subclass 110]110 Subclass 110 indent level is 3 Ingredient contains a silicon atom as part an organic compound
 [List of Pre Grant Publications for class 521 subclass 113][List of Patents for class 521 subclass 113]113 Subclass 113 indent level is 3 Ingredient is aldehyde or ketone
[List of Pre Grant Publications for class 521 subclass 114][List of Patents for class 521 subclass 114]114 Subclass 114 indent level is 3 Ingredient contains a -C-X-C- group wherein X is a chalcogen atom and none of the C atoms bonded to the chalcogen are double-bonded to an additional chalcogen atom
[List of Pre Grant Publications for class 521 subclass 117][List of Patents for class 521 subclass 117]117 Subclass 117 indent level is 3 Ingredient contains a -C-XH group wherein X is a chalcogen atom and the carbon atom is not double-bonded to a chalcogen atom, phenol, etc.
 [List of Pre Grant Publications for class 521 subclass 119][List of Patents for class 521 subclass 119]119 Subclass 119 indent level is 3 Ingredient is inorganic halogen containing material
[List of Pre Grant Publications for class 521 subclass 120][List of Patents for class 521 subclass 120]120 Subclass 120 indent level is 3 Ingredient contains a sulfur atom
 [List of Pre Grant Publications for class 521 subclass 122][List of Patents for class 521 subclass 122]122 Subclass 122 indent level is 3 Ingredient contains a silicon atom
[List of Pre Grant Publications for class 521 subclass 123][List of Patents for class 521 subclass 123]123 Subclass 123 indent level is 3 Ingredient contains a metal atom
[List of Pre Grant Publications for class 521 subclass 128][List of Patents for class 521 subclass 128]128 Subclass 128 indent level is 3 Ingredient is a nitrogen containing compound
 [List of Pre Grant Publications for class 521 subclass 130][List of Patents for class 521 subclass 130]130 Subclass 130 indent level is 3 Ingredient contains a carbon atom double bonded to oxygen, e.g., carboxylic acid, etc.
[List of Pre Grant Publications for class 521 subclass 131][List of Patents for class 521 subclass 131]131 Subclass 131 indent level is 3 Ingredient contains only carbon and hydrogen atoms, only C and halogen atoms, or only C, H, and halogen atoms
 [List of Pre Grant Publications for class 521 subclass 133][List of Patents for class 521 subclass 133]133 Subclass 133 indent level is 3 Ingredient is gaseous at ambient conditions, e.g., air, oxygen, etc.
[List of Pre Grant Publications for class 521 subclass 134][List of Patents for class 521 subclass 134]134 Subclass 134 indent level is 2 Cellular product derived from two or more solid polymers or from at least one solid polymer and at least one polymer-forming system
 [List of Pre Grant Publications for class 521 subclass 141][List of Patents for class 521 subclass 141]141 Subclass 141 indent level is 2 Cellular vinyl alcohol polymer
[List of Pre Grant Publications for class 521 subclass 142][List of Patents for class 521 subclass 142]142 Subclass 142 indent level is 2 Cellular product derived from ethylenically unsaturated reactants only
 [List of Pre Grant Publications for class 521 subclass 151][List of Patents for class 521 subclass 151]151 Subclass 151 indent level is 2 Cellular polymer derived from tar, pitch, bitumen, asphalt, or plant material of unknown constitution, e.g., nut shell liquor, etc.
 [List of Pre Grant Publications for class 521 subclass 152][List of Patents for class 521 subclass 152]152 Subclass 152 indent level is 2 Cellular product derived from boron containing reactant
 [List of Pre Grant Publications for class 521 subclass 153][List of Patents for class 521 subclass 153]153 Subclass 153 indent level is 2 Cellular product derived from aluminum or heavy metal containing reactant
 [List of Pre Grant Publications for class 521 subclass 154][List of Patents for class 521 subclass 154]154 Subclass 154 indent level is 2 Cellular product derived from silicon containing reactant
[List of Pre Grant Publications for class 521 subclass 155][List of Patents for class 521 subclass 155]155 Subclass 155 indent level is 2 Cellular product derived from a -N=C=X containing reactant wherein X is a chalcogen atom
[List of Pre Grant Publications for class 521 subclass 178][List of Patents for class 521 subclass 178]178 Subclass 178 indent level is 2 Cellular product derived from a reactant containing two or more three membered heterocyclic rings wherein two of the ring members are carbon atoms and the remaining ring member is a chalcogen atom
[List of Pre Grant Publications for class 521 subclass 180][List of Patents for class 521 subclass 180]180 Subclass 180 indent level is 2 Cellular product derived from a phenol, phenol ether, or inorganic phenolate reactant
[List of Pre Grant Publications for class 521 subclass 182][List of Patents for class 521 subclass 182]182 Subclass 182 indent level is 2 Cellular product derived from a -C-C(=X)-X containing reactant wherein X is a chalcogen atom, e.g., phthalic acid, etc.
[List of Pre Grant Publications for class 521 subclass 186][List of Patents for class 521 subclass 186]186 Subclass 186 indent level is 2 Cellular product derived from reactant which is an aldehyde or aldehyde derivative
 [List of Pre Grant Publications for class 521 subclass 189][List of Patents for class 521 subclass 189]189 Subclass 189 indent level is 2 Cellular product derived from reactant containing a carbon to chalcogen bond
 
CROSS-REFERENCE ART COLLECTIONS
 
 [List of Pre Grant Publications for class 521 subclass 901][List of Patents for class 521 subclass 901]901 CELLULAR POLYMER CONTAINING A CARBODIIMIDE STRUCTURE
 [List of Pre Grant Publications for class 521 subclass 902][List of Patents for class 521 subclass 902]902 CELLULAR POLYMER CONTAINING AN ISOCYANURATE STRUCTURE
 [List of Pre Grant Publications for class 521 subclass 903][List of Patents for class 521 subclass 903]903 CELLULAR POLYMER HAVING REDUCED SMOKE OR GAS GENERATION
 [List of Pre Grant Publications for class 521 subclass 904][List of Patents for class 521 subclass 904]904 POLYURETHANE CELLULAR PRODUCT HAVING HIGH RESILIENCY OR COLD CURE PROPERTY
 [List of Pre Grant Publications for class 521 subclass 905][List of Patents for class 521 subclass 905]905 HYDROPHILIC OR HYDROPHOBIC CELLULAR PRODUCT
 [List of Pre Grant Publications for class 521 subclass 906][List of Patents for class 521 subclass 906]906 POLYURETHANE CELLULAR PRODUCT CONTAINING UNREACTED FLAME-RETARDANT MATERIAL
 [List of Pre Grant Publications for class 521 subclass 907][List of Patents for class 521 subclass 907]907 NONURETHANE FLAMEPROOFED CELLULAR PRODUCT
 [List of Pre Grant Publications for class 521 subclass 908][List of Patents for class 521 subclass 908]908 NUCLEATING AGENT FOR CELLULAR PRODUCT
 [List of Pre Grant Publications for class 521 subclass 909][List of Patents for class 521 subclass 909]909 BLOWING-AGENT MODERATOR, E.G., KICKERS, ETC.
 [List of Pre Grant Publications for class 521 subclass 910][List of Patents for class 521 subclass 910]910 PLURAL BLOWING AGENTS FOR PRODUCING NONPOLYURETHANE CELLULAR PRODUCTS
 [List of Pre Grant Publications for class 521 subclass 911][List of Patents for class 521 subclass 911]911 SURFACTANT FOR OTHER THAN POLYURETHANE CELLULAR PRODUCT
 [List of Pre Grant Publications for class 521 subclass 912][List of Patents for class 521 subclass 912]912 SEPARATED REACTIVE MATERIALS UTILIZED IN PREPARING CELLULAR PRODUCT
 [List of Pre Grant Publications for class 521 subclass 913][List of Patents for class 521 subclass 913]913 CELL FORMING IN ABSENCE OF EXTERNAL HEAT
 [List of Pre Grant Publications for class 521 subclass 914][List of Patents for class 521 subclass 914]914 POLYURETHANE CELLULAR PRODUCT FORMED FROM A POLYOL WHICH HAS BEEN DERIVED FROM AT LEAST TWO 1,2 EPOXIDES AS REACTANTS
 [List of Pre Grant Publications for class 521 subclass 915][List of Patents for class 521 subclass 915]915 UTILIZING ELECTRICAL OR WAVE ENERGY DURING CELL FORMING PROCESS
 [List of Pre Grant Publications for class 521 subclass 916][List of Patents for class 521 subclass 916]916 CELLULAR PRODUCT HAVING ENHANCED DEGRADABILITY
 [List of Pre Grant Publications for class 521 subclass 917][List of Patents for class 521 subclass 917]917 SPECIALIZED MIXING APPARATUS UTILIZED IN CELL FORMING PROCESS
 [List of Pre Grant Publications for class 521 subclass 918][List of Patents for class 521 subclass 918]918 PHYSICAL AFTERTREATMENT OF A CELLULAR PRODUCT
 [List of Pre Grant Publications for class 521 subclass 919][List of Patents for class 521 subclass 919]919 SINTERED PRODUCT
 [List of Pre Grant Publications for class 521 subclass 920][List of Patents for class 521 subclass 920]920 CELLULAR PRODUCT CONTAINING A DYE OR PIGMENT
 [List of Pre Grant Publications for class 521 subclass 921][List of Patents for class 521 subclass 921]921 PREPARING A NONPOLYURETHANE CELLULAR PARTICLE FROM A NONPARTICULATE MATERIAL
 
FOREIGN ART COLLECTIONS
 
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