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Class Information
Number: 521/174
Name: Synthetic resins or natural rubbers -- part of the class 520 series > Synthetic resins (class 520, subclass 1) > Cellular products or processes of preparing a cellular product, e.g., foams, pores, channels, etc. > Cellular product derived from a -n=c=x containing reactant wherein x is a chalcogen atom > With -xh reactant wherein x is a chalcogen atom > -xh reactant contains a c-x-c group
Description: Subject matter wherein the -XH reactant contains a -C-X-C group (X is a chalcogen).










Sub-classes under this class:

Class Number Class Name Patents
521/177 C-x-c reactant contains a carbocyclic ring, e.g., aromatic, etc. 70
521/175 C-x-c reactant contains a carbohydrate group 127
521/176 With non -c-x-c- containing reactant 265


Patents under this class:
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Patent Number Title Of Patent Date Issued
6077927 Process for coloring polymer resins and products thereof Jun. 20, 2000
6075064 Rigid hydrophobic polyurethanes Jun. 13, 2000
6071977 Hydrosilation in high boiling natural vegetable oils Jun. 6, 2000
6071978 Method of producing hydrocarbon-expanded rigid polyurethane foams Jun. 6, 2000
6069184 Method for the preparation of polyurethane elastomers May. 30, 2000
6066683 Molded and slab polyurethane foam prepared from double metal cyanide complex-catalyzed polyoxyalkylene polyols and polyols suitable for the preparation thereof May. 23, 2000
6063308 Preparation of a homogeneous polyol component which is stable to separation May. 16, 2000
6063824 Microcellular urea-containing polyurethane elastomer May. 16, 2000
6063825 Flexible polyurethane foam with high durability May. 16, 2000
6060531 Production of low-fogging polyurethane foams, and specific polyoxyalkylene-polyols which can be used for this purpose May. 9, 2000
6051622 Low resilience, low frequency molded polyurethane foam Apr. 18, 2000
6051624 Polyol combination Apr. 18, 2000
6037382 Process for preparing a flexible polyurethane foam Mar. 14, 2000
6037383 Microcellular polyurethane elastomer containing urea groups Mar. 14, 2000
6034145 Process for rigid polyurethane foams Mar. 7, 2000
6034148 Energy absorbing foams Mar. 7, 2000
6034149 Hydrophilic polyurethane foams Mar. 7, 2000
6034197 Polyol blend, multi-component system for producing polyurethane foam, and foam produced thereby Mar. 7, 2000
6031010 Polyurethane foam composition having improved flex fatigue Feb. 29, 2000
6031013 Production of polyurethane foams Feb. 29, 2000
6028122 Energy absorbing, water blown, rigid polyurethane foam Feb. 22, 2000
6022903 Permanent gas blown microcellular polyurethane elastomers Feb. 8, 2000
6020390 Process for making flexible polyurethane foams Feb. 1, 2000
6020391 Flexible polyurethane foams Feb. 1, 2000
6013690 Low density rigid polyurethane foams having improved substrate adhension characteristics Jan. 11, 2000
6013691 Expansible sealant compositions and blowing agents Jan. 11, 2000
6011110 Carrier for bioreactor and method of producing the same Jan. 4, 2000
6008263 Molded and slab polyurethane foam prepared from double metal cyanide complex-catalyzed polyoxyalkylene polyols and polyols suitable for the preparation thereof Dec. 28, 1999
6005016 Rigid polyurethane foam based on polyethers of TDA Dec. 21, 1999
6001890 Open celled cellular polyurethane products Dec. 14, 1999
5998494 Rigid polyurethane foams Dec. 7, 1999
5990187 Method of preparing polyurethane foam utilizing organofunctionally modified polysiloxanes Nov. 23, 1999
5977198 Process for the production of resilient, flexible polyurethane foams Nov. 2, 1999
RE36358 Flame retardant polyurethane foams Oct. 26, 1999
5962120 Abrasive article back up pad with foam layer Oct. 5, 1999
5962542 Process for producing hydrocarbon-blown hard polyurethane foams Oct. 5, 1999
5958992 Blowing agent blends Sep. 28, 1999
5958994 Method for decreasing the propensity for phase-out of the high molecular weight component of double metal cyanide-catalyzed high secondary hydroxyl polyoxypropylene polyols Sep. 28, 1999
5951796 Two component polyurethane construction adhesive and method of using same Sep. 14, 1999
5925687 Production of flexible polyurethane foams Jul. 20, 1999
5919395 Polyol combination Jul. 6, 1999
5916480 Storage-stable emulsions for producing fine-celled rigid foams based on isocyanate Jun. 29, 1999
5916994 Polymer polyols and preparation thereof Jun. 29, 1999
RE36233 Use of softening additives in polyurethane foam Jun. 22, 1999
5902835 Group IVB metal blowing catalyst compositions for the production of polyurethane foams May. 11, 1999
5900087 Preparation of flexible, flame-bondable polyurethane-polyether foams having improved adhesion May. 4, 1999
5900442 Flexible polyurethane foams May. 4, 1999
5895824 Preparation of polyether polyols containing aromatics Apr. 20, 1999
5891928 Preparation of flexible, flame-bondable polyurethane polyether foams having improved adhesion Apr. 6, 1999
5889067 Open cell rigid polyurethane foam and method for producing the same and method for making vacuum insulation panel using same Mar. 30, 1999

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