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Class Information
Number: 521/170
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
Description: Subject matter wherein a -XH (X is a chalcogen containing material) is reacted with a -N=C=X containing material.










Sub-classes under this class:

Class Number Class Name Patents
521/174 -xh reactant contains a c-x-c group 1,057
521/172 -xh reactant contains a c=x group, e.g., carboxylic acid ester, etc. 540
521/171 -xh reactant contains a halogen atom 82


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Patent Number Title Of Patent Date Issued
6670404 Polymeric foam powder processing techniques, foam powders products, and foams produced containing those foam powders Dec. 30, 2003
6660779 Method of manufacturing rigid polyurethane foam material, method of manufacturing refrigerator, and refrigerator Dec. 9, 2003
6660781 Process for preparing polyurethane foam Dec. 9, 2003
6660783 Preparation of highly resilient polyurethane foams Dec. 9, 2003
6660782 Rigid polyurethane foams and method to form said foams using low molecular weight diols and triols Dec. 9, 2003
6653361 Flame retardant polyurethane composition and method of manufacture thereof Nov. 25, 2003
6653363 Low energy-loss, high firmness, temperature sensitive polyurethane foams Nov. 25, 2003
6649667 Polyurethane foams having improved heat sag and a process for their production Nov. 18, 2003
6649726 Two-component type polyurethane composition and process of preparing the same Nov. 18, 2003
6646020 Isopropyl chloride with hydrofluorocarbon or hydrofluoroether as foam blowing agents Nov. 11, 2003
6642284 Flame-retardant coating Nov. 4, 2003
6642283 Stable novel black polyurethane article colorants Nov. 4, 2003
6638986 Preparation of in situ-reticulated flexible polyurethane foams Oct. 28, 2003
6638990 Flame-laminable polyurethane foams Oct. 28, 2003
6638989 Method of preparing polyurethane-modified polyisocyanurate foam Oct. 28, 2003
6638987 Azeotrope-like compositions of tetrafluoroethane, pentafluoropropane and water Oct. 28, 2003
6635688 Composite polyurethane foams and method of manufacture thereof Oct. 21, 2003
6635686 Azeotrope-like compositions of tetrafluoroethane, pentafluoropropane and methylbutane Oct. 21, 2003
6632851 Flame-laminable polyurethane foams Oct. 14, 2003
6627671 Methods for making urethane molded products for polishing pads Sep. 30, 2003
6617367 Internally generated rotor set for low viscosity and abrasive metering applications Sep. 9, 2003
6617365 Use of silicon-polyether copolymers in the production of high resilience polyurethane foams Sep. 9, 2003
6608160 Composition for production of cover packing and process for production of cover packing using the same Aug. 19, 2003
6605650 Process of making lightweight, rigid polyurethane foam Aug. 12, 2003
6602926 Catalyst system for the NCO/OH reaction (polyurethane formation) Aug. 5, 2003
6602925 Open-celled polyurethane foams containing graphite which exhibit low thermal conductivity Aug. 5, 2003
6602927 Polyisocyanurate foams Aug. 5, 2003
RE38201 Amido functional amine catalysts for the production of polyurethanes Jul. 22, 2003
6593385 Halogen-free, pentane-blown, flame-retardant rigid polyurethane foam and a process for its production Jul. 15, 2003
6590005 Isocyanate compositions for blown polyurethane foams Jul. 8, 2003
6590007 Flame-resistant hr cold-moulded foam with reduced fume density and toxicity Jul. 8, 2003
6590003 Method for producing soft to semi-rigid polyurethane integral foamed materials Jul. 8, 2003
6586486 Preparation of low-density hydrophilic flexible polyurethane foams Jul. 1, 2003
6586485 Production of flexible polyurethane foams Jul. 1, 2003
6586487 Low-density, water blown polyurethane foams for energy-absorbing applications Jul. 1, 2003
6586490 Polyol mixture for the preparation of rigid polyurethane foams Jul. 1, 2003
6583192 Preparation of flexible polyurethane foams Jun. 24, 2003
6583194 Foams having shape memory Jun. 24, 2003
6579912 Process for preparing a flexible polyurethane foam Jun. 17, 2003
6576682 Use of reactive amines for the preparation for polyurethane foams Jun. 10, 2003
6563007 Preparation of polyetherols May. 13, 2003
6562880 Polyurethane or polyisocyanurate foams blown with hydrofluorocarbons and carbon atoms May. 13, 2003
6559196 Tough, fire resistant polyurethane foam and method of manufacture thereof May. 6, 2003
6552098 Open-celled semi-rigid foams with exfoliating graphite Apr. 22, 2003
6541534 Rigid polyurethane foams Apr. 1, 2003
6541532 Scorch inhibiting compositions for polyurethane foams Apr. 1, 2003
6541531 Method of introduction of liquid additives utilizing an improved dosing assembly Apr. 1, 2003
6541411 Titanium/zirconium catalysts and their use to prepare esters or polyesters Apr. 1, 2003
6538043 Co-initiated polyether polyol and process for its preparation Mar. 25, 2003
6534555 Catalyst systems for polyurethane polyester foams Mar. 18, 2003

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