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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
3969437 Cyclic phosphorus esters Jul. 13, 1976
3951885 Method of making magnesium oxychloride cement cofoamed with synthetic resin Apr. 20, 1976
3943076 Flame retardants for plastic foams Mar. 9, 1976
3935133 High resilience polyurethane foam stabilized with a silicate-based surfactant composition Jan. 27, 1976
3933697 Method for preparing a polyurethane foam comprising quaternary ammonium salt as antistatic agent Jan. 20, 1976
3933694 Low smoke-output polyurethane and polyisocyanurate foams Jan. 20, 1976
3931064 Polymer foams Jan. 6, 1976
3931060 Polyurethane foam free from internal discoloration Jan. 6, 1976
3931059 Process for preparing polycarbodiimide foams in the presence of phosphetane oxide or sulfide adducts Jan. 6, 1976

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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