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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
8691883 Aerogel-foam composites Apr. 8, 2014
8673991 Two-part curable polyurethane foam resin composition, molded article using the same, and shoe sole Mar. 18, 2014
8673992 Polyurethane gel foams Mar. 18, 2014
8658709 Process for making a polyurethane foam Feb. 25, 2014
8658708 Foam-forming compositions containing azeotropic or azeotrope-like mixtures containing Z-1,1,1,4,4,4-hexafluoro-2-butene and methyl formate and their uses in the preparation of polyisocyanate-b Feb. 25, 2014
8642669 Foamable low-viscosity mixtures Feb. 4, 2014
8642670 Coarse-cell polyurethane elastomers Feb. 4, 2014
8629195 Production of polyurethane foams Jan. 14, 2014
8623931 Protein-containing foams, manufacture and use thereof Jan. 7, 2014
8623984 Compositions containing polyether-polysiloxane copolymers Jan. 7, 2014
8618337 Process for preparing polyether alcohols Dec. 31, 2013
8618014 Fast demold/extended cream time polyurethane formulations Dec. 31, 2013
8604093 Fire-resistant polyurethane foam and fabrication method thereof Dec. 10, 2013
8598247 Polyurethane elastomers from renewable resources Dec. 3, 2013
8598248 Flexible polyurethane foams made from alkoxylated natural oil Dec. 3, 2013
8580864 Trimer catalysts with improved processability and surface cure Nov. 12, 2013
8575226 Vegetable oil-based coating and method for application Nov. 5, 2013
8575225 Use of low triphenylphosphate, high phosphorous content isopropyl phenyl phosphates as flame retardants in polyurethane or polyisocyanurate foams Nov. 5, 2013
8568061 Polyurethane foams for trench breaker and other applications Oct. 29, 2013
8557887 Process for producing rigid polyurethane foams Oct. 15, 2013
8557005 Polyurethane foam and polishing pad Oct. 15, 2013
8557886 Storage-stable polyol compositions for producing rigid polyisocyanurate foam Oct. 15, 2013
8552080 Polyurethane foams Oct. 8, 2013
8552078 Crosslinkers for improving stability of polyurethane foams Oct. 8, 2013
8552077 Trimer catalyst additives for improving foam processability Oct. 8, 2013
8551201 Polyurethane composition for CMP pads and method of manufacturing same Oct. 8, 2013
8552079 Water-blown, flame retardant rigid polyurethane foam Oct. 8, 2013
8546456 Fracture fixation systems Oct. 1, 2013
8541478 Rigid polyurethane foam and system and method for making the same Sep. 24, 2013
8541479 Low resilience flexible polyurethane foam and process for its production Sep. 24, 2013
8530534 Trimerization catalysts from sterically hindered salts Sep. 10, 2013
8530535 Polishing pad Sep. 10, 2013
8513318 Method for producing a rigid polyurethane foam Aug. 20, 2013
8501826 Process for the production of polyurethane products Aug. 6, 2013
8501828 Cure rebond binder Aug. 6, 2013
8497316 Crosslinkable and foaming polyester-polyurethane (hybrid) resin moulding compositions, with foaming characteristics for closed mould applications Jul. 30, 2013
8481605 Rigid polyurethane foam and system and method for making the same Jul. 9, 2013
8476328 Polishing pad Jul. 2, 2013
8476329 Bioresin composition for use in forming a rigid polyurethane foam article Jul. 2, 2013
8470902 Continuous pore elastomer and process for producing the same, and water-absorbing roller and swab Jun. 25, 2013
8466207 Method for providing a low density high strength polyurethane foam Jun. 18, 2013
8445555 Stabilized carbanions as trimerization catalysts May. 21, 2013
8445556 Cellular elastomer compositions May. 21, 2013
8426482 Method for producing viscoelastic polyurethane flexible foams Apr. 23, 2013
8404348 Resilient, water dispersible polyurethane foams and products incorporating same Mar. 26, 2013
8394868 Polyol prepolymers of natural oil based polyols Mar. 12, 2013
8389590 Process and installation for the production of foam in a continuous foaming process Mar. 5, 2013
8389775 Process for preparing polyether alcohols Mar. 5, 2013
8372892 Attached, high reactivity rigid polyurethane foams Feb. 12, 2013
8372893 Polyurethane foam Feb. 12, 2013

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